382 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 83 



brown; rarely with coxae, posterior tibiae, and all femora largely 

 brown; tarsi more or less testaceous to brownish; wings hyaline, 

 veins testaceous to brown, sometimes reddish basally. 



Male. — Length about 2-4 mm. Essentially similar to female, 

 differing largely as follows: Vertex and front laterad of carina often 

 brassy, sometimes more or less cupreous, rarely the whole head with 

 exception of scrobal cavity brassy or cupreous (resembling regalis); 

 dorsum of thorax often almost entirely brassy or cupreous and rarely 

 in larger part black or bronzy black; pleural region sometimes more 

 or less brass}'- or with a brassy reflection; abdomen very rarely with 

 some brassy or cupreous reflections; metallic stripe on anterior tibiae 

 generally abbreviated toward apex and rarely altogether absent, 

 intermediate and posterior tibiae quite consistently conspicuously 

 pale at apex. Portion of scape bearing sensorial punctures moder- 

 ately broad apically and comprising about one-third to nearly one- 

 half of scape, the sensoria fine to coarse and dense or moderately 

 dense. 



Type. — Evidently lost. Redescribed from a very large series of 

 specimens of both sexes. 



Distribution. — This is perhaps the most common of our species. It 

 occurs, evidently, throughout the United States and at least in 

 southern Canada. I have seen material from 35 States, the District 

 of Columbia, and 2 provinces in Canada, as follows: Maine (July, 

 Aug.); New Hampshire (June); Massachusetts (May to Sept., inch); 

 Rhode Island (June); Connecticut (May); New York (June to Sept., 

 inch); New Jersey (May to Sept., inch); Pennsylvania (July to Sept., 

 inch); Delaware; Maryland (May to Sept., inch); Virginia (June to 

 Sept., inch, "on thistle" and "Ceanothus"); North Carolina (June to 

 Sept., inch) ; Georgia (July) ; Florida (Jan.) ; Michigan (July) ; Indiana; 

 Alabama (Apr.); Wisconsin (July); lUinois (July); Minnesota (June, 

 July); Iowa (July); vSouth Dakota (July); Nebraska (June, July); 

 Kansas (June, Sept.); Texas (June, July, Dec); Montana (Aug.); 

 Wyoming; Colorado (June, 6,000 to 7,000 feet; July, "on hop"; 

 Aug.); New Mexico ("on Populus"); Idaho (June); Utah (July); 

 Arizona; Washington (July); Oregon; California (May to Jul.y, inch, 

 Nov.); District of Columbia (June, July); Nova Scotia (Aug., Sept.); 

 Ontario (July). 



Hosts. — Compsilura concinnata Meigen; Ernestia ampelus Walker; 

 ?£". rujicauda (Brauer); Achaetoneura euchaetiae Webber; A. melalo- 

 phae Allen; "tachinid puparium"; Eulimneria valida Cresson; Evlirri' 

 neria sp.; Apanteles hyphantriae Riley; A. melanoscelus Ratzeburg; 

 Meteorus hyphantriae Riley. I find also the following hosts recorded: 

 "Dijrrion cocoon"; ^'Hyphantria cunea Drury"; and "Euchaetias 

 egle Drury", but the real host was very likely some parasite attacking 

 these. 



