SYNOPSIS OF NORTH AMERICAN SYRPHIDiE. 115 



of the tarsi black; posterior legs brownish-red, femora and tibiae yel- 

 low at the base, tip of tibiae and tarsi fuscous-black, the intermediate 

 tarsal joints often less deeply so. Wings subhyaline, or subfuscous to- 

 wards the tip ; apical angle of first posterior cell rectangular. 



From S. lobata this species difiers. besides the color of the body, in 

 the last segment of the abdomen being less broad, and the hind femora 

 less incrassate. — Translation from Loew, compared with the type. 



A single female specimen from Washington Territory agrees per- 

 fectly with this description, except that I do not see that the hind fe- 

 mora are less incrassate than in S. lobata. The third joint of the an- 

 tennte. The thorax wholly, and the base of the abdomen are black. 



Sphegina lobata. 



Sphe<iina lobata Tuoew, Ceutur., iii, 21. 

 Eahitat. — White Mountains, New Hampshire, Oregon!, Middle States 

 (Lw.) 



' Length, 6^"^"'. Male. Head black. Face nearly wholly white. Eyes 

 separate; front of equal width; antennae luteous, arista sub-fuscous. 

 Thorax shining black; humeri and lateral spots of the dorsum testa- 

 ceous. Scutellum and abdomen black, shining; basal fascia of the 

 third abdominal segment yellow; anterior angles and i^osterior mar- 

 gin of the fourth segment testaceous. Hypopygium globose, black. 

 Left angle of the last ventral segment i)roduced into a large fuscous 

 testaceous lobe. Coxae and feet, whitish ; distal half of the hind femora, 

 except the extreme tip, black ; basal half of hind tibiae fuscous ; distal 

 portion imperfectly black annulate. Last two joints of the front, and 

 the first and la'st two of the hind tarsi, black— the intermediate ones sub- 

 fuscous. Wings subfuscous, stigma a little more obscure; apical angle 

 of the first posterior cell a right one. 



Female. Very similar to the male. Front a little broader. Distal 

 half of abdomen strongly dilated, the third and fourth segments with 

 two spots, large, testaceous, subobsolete ; fifth segment sordid white. 

 Last two joints of the four front tarsi blackish ; hind tarsi black, inter- 

 mediate joints a little less so. — Translation. 



Three specimens from Mount Washington, New Hampshire (Dr. 

 George Dimmock, Nos. 1494-7-8), and one male from Mount Hood, 

 Oregon, I have no doubt belong with this species, which is evidently 

 variable. For this reason I have chosen rather to reproduce the origi- 

 nal in translation and point out the differences. The female agrees 

 throughout, except that the humeri and interrupted bands of the abdo- 

 men are light yellow. The third joint of the antennae in the males is 

 more blackish than luteous, the face is blackish on the upper part; the 

 reddish color of the humeri and post-alar callus not very apparent in all 

 but one specimen. In the Eastern males the distal half of the second 

 segment of the abdomen (in one specimen the third wholly and the fourth 

 except a darker band in the middle) is red, the hypopygium more black- 



