152 



Hartig does not separate this genus from Dolerus, from which Leach 

 divided it. Stephens remarks that " the Dosythei invariably have 

 the middle of the abdomen red, whereas the Doleri have that part 

 entirely black." In two cases I do not find this hold true ; viz : D. 

 arvensu and D. collaris, which approach more closely to Dosytlieus 

 than Dolerus. 



1. D. ARVENSis. Say. Long's Sec. Ex. 2. 319. " Blackish viola- 

 ceous ; thorax rufous, a spot before and triangular spot behind, black ; 

 length over seven twentieths of an inch. Inhabits United States." 

 Maine, N. H., Mass., Conn., N. Y., Md., Fla., Mo. 



Twenty-nine specimens, all females. In many respects this resem- 

 bles D. unicolor. 



2. D. cOLLARis. Say. West. Quar. Rep. 2, 72, 1823. "Black, 

 thorax rufous before. Inhabits Missouri." Mass. (H. Coll.), Ct., ]\Ie. 



" Body entirely black ; with the exception of a yellowish rufous 

 anterior thoracic triangle and anterior segment or collar of the same 

 color, which descends on each side. 



Length to the tip of the wings nine twentieths of an inch ; length 

 of body five and a half twentieths. 



Four specimens examined. 



3. D. APRicus. Say. Harris's Cat. Black ; abdomen rufous ; the 

 three apical joints black. (Long. 0.25 to 0.30 in. Ex.alar. 0.50 to 0.60 

 in.) 



9 . Black ; head and thorax sericeous and punctured, very coarsely 

 upon the face, below the ocelli ; a sinus ^bove each of the upper 

 ocelli ; palpi fuscous ; wing scales and first six segments of abdomen 

 rufous ; apical edge of sixth and three remaining segments, black ; 

 legs black ; anterior femora wholly, and the four posterior femora, 

 except at tip, rufous ; anterior tibiae rufous beneath ; tarsi fuscous ; 

 wings hyaline, faintly clouded toward tips ; upper edge of stigma 

 black. 



$ . All the femora of the male are black, except at tip ; the four 

 anterior tibiae rufous ; posterior tibiae and tarsi fuscous. Hab. Mass. 

 (II. Collection), Conn., Md. (Mr. Uhler), Maine (Mr. Packard). 



Twelve specimens examined. 



Var. Alhlfrons. 9$. Color paler than D. ffy?nc?i.s'. First three 

 joints of antennae of male fulvous beneath; a point between antennae, 

 the clypeus and labrum of male, and the edge of clypeus and the 

 labrum of female, white ; legs yellowisli rufous ; apical two thirds of 

 intermediate -and posterior tibiae, and the tarsi blackish. 



Two specimens taken in Farmington, Conn. They resemble D. 

 apricus, except in the above points, which are distinct. 



4. D. Aprims, (n. sp.) Black ; abdomen with a rufous band ; legs 

 black. (9 S Long. 0.30 to 0.38 in. ; Ex. alar. 0.60 to 0.70 in.) 



