REPORT OF NATIONAL MUSEUM, 1920. 93 



The division of insects has been benefited by the work of many 

 workers not officially connected with the Museum. Thus Mrs. C. J. 

 Weld lias been a voluntary worker in Hymenoptera and has given 

 much time to the classification of the famity Chalcididae. Prof. 

 T. D. A. Cockerell, of the University of Colorado, has identified 

 many species of bees within the year. Mr. Nathan Banks, of the 

 Museum of Comparative Zoology at Harvard University, and Dr. 

 K. V. Chamberlin, of the same institution, have identified spiders 

 and myriopods, respectively. Prof. A. L. Malander, Pullman, 

 Washington; has returned with determinations many species of flies 

 of the family Borboridae, sent him in previous years. C. H. Ken- 

 nedy, Cornell University, has determined nymphs of Odonata. Con- 

 siderable work has been done by many members of the staff of the 

 Bureau of Entomology, the following being particularly mentioned : 

 Mr. R. A. Cushman has continued his investigations of the Ichneu- 

 mon flies and has also undertaken the identification of Philippine 

 Ichneumonidae collected by Mr. C. F. Baker and from the material 

 already received has named and described a number of species. 

 Mr. Robert M. Fonts spent the summer of 1919 working under the 

 direction of Mr. A. B. Gahan on the Serphoid parasites, especially 

 those of the family Platygasteridae, while Mr. Gahan has continued 

 to spend most of his time working on Chalcids. He also supervised 

 the work of Mr. C. F. W. Musebeck on the Braconid genus Apan- 

 teles. Dr. William M. Mann has continued his work on ants and 

 has completed his work on the collections he made in the Fiji Islands 

 and the West Indies. Reports on these have been submitted for 

 publication. The revision of the North American Phytophagous 

 chalcid-flies of the genus Uarmolita by Messrs. W. J. Phillips and 

 W. T. Emery has been published and all the material incorporated 

 in the collection. Mr. P. H. Timberlake finished his revision of the 

 genera Homalotylus and Isodromus which has been published by the 

 Museum. Mr. L. H. Weld prepared a manuscript which has been 

 submitted for publication, on the subterranean American Cynipid 

 galls on oaks. 



The division of marine invertebrates is particularly dependent 

 upon specialists mostly connected with institutions located outside 

 of Washington, owing to the insufficiency of the Museum staff. 

 Whenever material in certain groups arrives for determination of 

 deposit, it is sent to men engaged in research upon these special 

 lines. While many of those enumerated below have not received new 

 material during the year, everyone either has in his -possession some 

 Museum collections transmitted in previous years, or a report on 

 such material is now in press. This voluntary staff for the fiscal year 

 consisted of: Dr. Henry B. Bigelow (Medusae, Ctenophora), Dr. 

 L. R. Gary (Alcyonarians), Dr. R. V. Chamberlin (Gephyrea), Dr. 



