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vein of the wing is evanescent and engaged in a study of the immature stages of flies of the family Agromyzidae. Raymond C. Shannon completed revisionary studies of flies of the families Calliphoridae and Syrphidae. In connection with this work he prepared descriptions of many new forms in the national collection. W. L. McAtee and J. R. Malloch conducted investigations into the classification of Negro bugs, basing their studies almost entirely on materials in the national collection. During the last half of June Dr. H. H. Knight was employed by the Bureau of Entomology in taxonomic studies on bugs of the family Mididae. Members assigned to the study of Hymenoptera have had comparatively little time to do research other than that necessitated in the connection with the identification of material submitted. Practically all of Mr. Gahan's time was devoted to identification work; all of Mr. Rohwer's time was occupied in identification or administrative work; R. A. Cushman continued investigations into the taxonomy of Ichneumonid parasites of the tribe Ichneumonini and carried on investigational studies throughout the entire family Ichneumonidae, practically completing a check list of the North American Ichneumon flies.
Dr. Mary J. Rathbun, associate in zoology, has worked for the greater part of the year on the third volume of her series of monographs on American crabs. The present volume will embrace the Cancroidea, comprising the families of crabs known as the Xanthidae and Portunidae, and their relatives. She has prepared also a report on the Decapoda of the Canadian Atlantic fauna for the Biological Board of Canada, and has identified great numbers of modern and fossil crabs for the Museum and the Geological Survey. Her treatise on the Fossil Decapods of the Pacific Slope of North America is about to go to press. Doctor Rathbun has been asked to serve as section editor for Crustacea by the abstracting journal "Biological Abstracts" about to be established under the auspices of the union of American biological societies.
The curator of marine invertebrates, Dr. Waldo L. Schmitt, devoted a considerable part of the year to field work in South America under the Walter Rathbone Bacon scholarship of the Smithsonian Institution. The field studies prosecuted under these auspices have supplemented his researches on the Museum collections, supplying information regarding habits, distribution, and other matters obtainable in no other way. Many accumulated routine identifications have been made during the time spent in the laboratory. The report on the collection of Siamese Macrura made by Dr. Hugh M. Smith is virtually complete. Clarence R. Shoemaker, assistant curator, has devoted available research time to study of the amphipods collected in the vicinity of the Tortugas Laboratory of the Carnegie Institu
tion, by Doctor Schmitt, Dr. T. W. Vaughan, Capt. F. A. Potts, and others. Work has been continued from time to time upon the amphipods secured during the fisheries research project of the Biological Board of Canada in the Gulf of St. Lawrence in 1917. The report on the amphipods collected by Frits Johansen in Hudson Bay in 1920, finished last year, is about to appear in print; while a report on the amphipods of the family Bateidae has been completed and published by the Museum, as noted in the accompanying bibliography. Much current amphipod material sent to the Museum during the past year has been identified as received, and the sorting and preservation of this year's incoming collection has been completed. Mr. Shoemaker's accomplishments in building the amphipod collections to their present state of excellence are particularly to be commended, as of the several sections of crustacea covered by the division, this had been the least studied at the time of his appointment to the scientific staff. J. O. Maloney, aid, has had increasing demands made upon his research time by many calls for determinations of isopods for the Federal Horticultural Board, the number of which has been steadily increasing for several years. Owing to the lack of labor service, Mr. Maloney has been forced to give much time to the care of the alcoholic collections.
Dr. Maynard M. Metcalf, collaborator, spent four months in South America in continuation of his studies on opalinid parasites. of frogs. He reports a most successful season and is at present engaged in working up his results. Dr. Max M. Ellis, collaborator, as time has permitted, has continued his studies on discodrilid worms. Dr. William H. Longley, collaborator, professor of zoology at Goucher College and acting director of the Marine Biological Laboratory of the Carnegie Institution, will make a trip to Hawaii and the Dutch East Indies, in continuation of his studies on the coloration of fishes, their food habits, and their relation to invertebrate marine life. These studies are in part in continuation of a research problem undertaken by Doctor Longley and the curator on the feeding habits of fishes of the Tortugas region. H. K. Harring, custodian of the Rotatoria, as in past years continued his intensive studies on rotifers. Mr. Harring will undertake supervision of the literature on Rotifera and Chaetognatha, as section editor for "Biological Abstracts."
Dr. William Healey Dall, honorary curator of the division of mollusks, has devoted his time to various researches during the year. A revision of the Trochidae was made incidental to the work of rearrangement of this group. D. Thaanum, of Honolulu, with J. B. Langford sent specimens collected by them in Japan and the Riu-kiu Islands, which were studied, identified, and several new
forms described. A small collection of mollusks, received from the National Geographic Society, obtained by their Greenland expedition, was studied, and one very interesting new species was found in material from dredging near Etah. Doctor Dall has also prepared a report now in press on a collection of land shells from the Tres Marias, Socorro, and Clarion Islands west of Mexico, secured by an expedition from the California Academy of Sciences. He has also identified and reported on collections made on the coast of Labrador and Hudson Bay for the Biological Survey of Canada. Dr. Paul Bartsch, curator of mollusks, has nearly completed a monograph on the family Naninidae. The major portion of his available time for research during the present year has been devoted to the preparation of a monograph on the Annularidae of the West Indies, which is about half completed. He has also prepared papers describing new mollusks from various localities in the new world, and on the shipworms secured in Philippine waters by the United States Bureau of Fisheries expedition in 1907-1910. William B. Marshall, assistant curator, has completed a report on the pearly fresh-water mussels collected during the United States Bureau of Fisheries pearl mussel investigation in the Mississippi Valley. He has also made a study of the shells of the genus Mulleria, giving especial attention to the methods by which they attach themselves to the bottom of streams, discussing the grotesque forms that arise through their molding themselves about surfaces and into crevices. He has submitted for publication a paper describing 12 new species from Central and South America.
The research work of Austin H. Clark, curator of echinoderms, has consisted in completion of the synonymies of all the recent unstalked crinoids, and the redescription of nearly all of them, in connection with the preparation of a forthcoming part of Bulletin 82. This work, which is very exacting, proved more laborious than had been anticipated; but it is hoped that the manuscript for this part may be completed during the summer months. No other research work in the echinoderm field was undertaken, it being the curator's intention to concentrate all his energies on the completion of this monograph.
Dr. Frederick V. Coville, curator of plants, has continued his studies upon the breeding and propagation of blueberries (Vaccinium), as well as similar work with the gooseberries (Grossularia). Dr. J. N. Rose, associate curator, continued studies of the family Caesalpiniaceae, in collaboration with Dr. N. L. Britton, director of the New York Botanical Garden, with a view to the publication of a monograph of the North American species. He has begun, also, a study of the related family, Mimosaceae. In addition, he has
given attention to the Cactaceae and Crassulaceae, in continuation of earlier monographic studies. Dr. W. R. Maxon, associate curator, continued work upon tropical American ferns, and completed a descriptive account of the ferns of Porto Rico (recently published). In connection with the latter undertaking, he studied and revised the determinations of many groups of West Indian and continental American ferns. Paul C. Standley, associate curator, read the proofs of the fifth and final part of the Trees and Shrubs of Mexico. He nearly completed an account of the flowering plants of the Panama Canal Zone, and published several short papers describing new species of Mexican and Central American plants. At the request of the botanists of Costa Rica, he has undertaken to prepare a list of the plants of Costa Rica, to be accompanied by economic and other data. In this connection it may be mentioned that a bulletin upon the wild flowers of Glacier National Park, prepared for publication over six years ago, at the request of the National Park Service, has been approved recently for printing by that office, and it is expected that it will be published in the near future. Emery C. Leonard, aid, has continued studies of West Indian plants, and has done some work upon a proposed synoptic flora of Haiti. He completed a revision of the American species of Scutellaria, and has begun studies of the family Convolvulaceae. Ellsworth P. Killip, aid, has nearly completed an account of the genus Passiflora, and has continued his studies of tropical American Urticaceae. He has undertaken monographic accounts of several groups of South American plants. In prosecution of these studies in the summer of 1925 he visited several of the large European herbaria for the purpose of consulting types and other collections.
Dr. James P. Chapin, American Museum of Natural History, New York, named about 200 skins of African birds, and Dr. Herbert Friedmann, Cambridge, Mass., determined a few from the same region. W. E. C. Todd, Carnegie Museum, Pittsburgh, Pa., identified a few species of birds from South America. Some identifications of snakes were made for the National Museum, by Dr. Malcolm Smith, London, England, Dr. Afranio do Amaral, Cambridge, Mass., and Dr. F. N. Blanchard, University of Michigan; Dr. E. R. Dunn, Smith College, Northampton, Mass., determined a number of salamanders. An arrangement was made with Dr. Henry W. Fowler, Academy of Natural Sciences, Philadelphia, for a report upon certain families of Philippine Island fishes, mostly collected during the cruise in the archipelago of the Bureau of Fisheries steamship Albatross. Several thousand pages of manuccript have already been received. Among the numerous entomologists who have identified whole groups or individual specimens are C. Howard Curran, Ottawa, Canada; M. Bezzi, Turin, Italy; C. P. Alexander, Amherst, Mass.;
F. Hendel, Vienna, Austria; and E. T. Cresson, jr., Philadelphia, Pa. (flies); William T. Davis, Staten Island, N. Y. (cicadas); R. W. Dawson, St. Paul, Minn.; W. D. Funkhouser, Lexington, Ky.; H. B. Hungerford, Lawrence, Kans.; Robert J. Sim, Riverton, N. J.; E. Liljeblad, Chicago, Ill., and A. d'Orchymont, Belgium (beetles); C. H. Kennedy, Columbus, Ohio (dragonflies); H. T. Fernald, Amherst, Mass. (wasps); T. H. Frison, Urbana, Ill., and H. F. Schwarz, New York City (bees); C. R. Crosby, Ithaca, N. Y. (spiders). Spiders were also sent to the Museum of Comparative Zoology for identification. The division of marine invertebrates has been assisted by a number of unofficial collaborators, to whose indispensible services the curator gratefully credits the successful working of the division. Those who have kindly named material, or to whom collections have been submitted, include the following: Dr. H. Boschma (rhizocephalids); Dr. L. R. Cary (alcyonarians); Dr. R. V. Chamberlain (annelids and Gephyrea); Dr. Henri Coutiere (Crangonidae); Dr. Joseph A. Cushman (Foraminifera); Prof. G. S. Dodds (fresh-water Entomostraca); Prof. Max Ellis (discodrilids); Dr. A. G. Huntsman (ascidians); Dr. C. Dwight Marsh (fresh-water copepods); Dr. Maynard M. Metcalf (Salpa, Pyrosoma, Protozoa); Dr. Raymond C. Osburn (Bryozoa); Capt. F. A. Potts (rhizocephalids); Miss Caroline E. Stringer (Tubellaria); Dr. W. M. Tattersall (Mysidacea); Mr. Frits Johansen, Department of Marine and Fisheries, Ottawa, Canada (phyllopods); Prof. T. Kaburaki, Science College, Tokyo, Japan (flatworms from China); Dr. J. Percy Moore, University of Pennsylvania, Philadelphia, Pa. (leeches from China); Dr. H. B. Bigelow, Museum of Comparative Zoology, Cambridge, Mass (Medusae ctenophora); Dr. C. C. Nutting, State University of Iowa, Iowa City, Iowa (hydroids); Dr. H. A. Pilsbry, Academy of Natural Sciences, Philadelphia, Pa. (barnacles); Dr. Frank Smith, University of Illinois, Urbana, Ill. (earthworms); Dr. A. L. Treadwell, Vassar College, Poughkeepsie, N. Y. (annelid worms); Dr. W. G. Van Name, American Museum of Natural History, New York City (ascidians); Dr. Charles B. Wilson, State normal school, Westfield, Mass. (copepods); Dr. H. V. Wilson, University of North Carolina, Chapel Hill, N. C. (sponges). In this connection may be mentioned the generous assistance rendered by the Scripps Institute for Oceanography through the director, Dr. T. Wayland Vaughan, in determining the salinity of 20 or more water samples obtained by Doctor Schmitt in his studies on the South American macruran fauna.
The curator of mollusks gratefully acknowledges assistance rendered by Dr. Frank C. Baker, University of Illinois, Urbana, Ill., in all cases where critical determinations in the genus Lymnaea were involved. He also wishes to place on record in this connection the