6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



Besides the type which was taken at Washington, District of Co- 

 lumbia, the National Collection contains one female specimen col- 

 lected by Dr. J. M. Aldrich at Lafayette, Indiana, Aug. 11, 1918. 

 No other specimens of this species are known to me. 



2. ELASMOSOMA PERGANDEI Ashmead. 



Elasnwsoina pergandei Ashmead, Proc. Eut. Soc. Wash., vol. 3, 1895, p. 283. 



Type. — In the United States National Museum. 



The slightly infumated wings readily separate this species from 

 vigilans, which it closely resembles. 



I^own only from the type, collected at Washington, District of 

 Columbia, and one other female specimen in the National Museum 

 labeled " Lawrence, Kansas, Geo. B. King." 



3. ELASMOSOMA VIGILANS Cockerell. 



Elasmosoma vigilans Cockerell, Proc. Ent. Soc. Wash., vol. 10, 1909, p. 168. 



Type. — In the United States National Museum. 



The two female specimens in the type series are exceedingly like 

 hakeri Ashmead, of which only males are known, and quite possibly 

 may eventually prove to be that species. Cockerell, in his description 

 of vigilans, erred in referring to the antennae as 12-segmented. They 

 are 13-segmented, the last two, however, being less distinctly separated 

 than the others. 



Boulder, Colorado. 



Known only from the type material. 



4. ELASMOSOMA BAKERI Ashmead. 



Elasmosoma hakeri Ashmead, Proc. Ent. Soc. Wash., vol. 3, 1895, p. 382. 



Type. — In the United States National Museum. 



As noted in the discussion of vigilans, I suspect that these two 

 species are but opposite sexes of the same form. However, I hesitate 

 to place vigilans in synonymy on the basis of so little material. 



Fort Collins, Colorado; Mesilla. New Mexico; Falls Church, Vir- 

 ginia. 



Besides the type specimens the National Collection contains one 

 specimen labeled "Colo. 1228, Collection C F. Baker;" and another 

 labeled " Mesilla, N. Mex." I have also seen one specimen in the col- 

 lection of Mr. Nathan Banks, at the Museum of Comparative Zoology, 

 Cambridge, Massachusetts, which was taken by Mr. Banks at Falls 

 Church, Virginia, May 30. 



Subfamily Microgasterinae. 



Microgasteroidae Foerstee, Verh. der naturh. Ver. preuss. Rheinl. und 



Westph., vol. 19, 1862, p. 244. 

 Microgasterides Marshall. Trans. London Ent. Soc. 1885, p. 151. 



