136 INSDCUTOR INSCITI^ MENSTRUUS 



one humeral. Occiput gray black, antennae to front orange- 

 yellow, face and cheeks red-yellow. One strong vibrissa, 

 below a single row of longish black hairs to lower corner, and 

 three of another row next to vibrissse. Antennae red-yellow, 

 arista medium long, black, and microscopically pubescent. 



Thorax gray black, one thin median red brown stripe, the 

 dorsocentrals rising from small oval spots of the same color. 

 Dorsum with long fine black hair, scutellum gray-black, with 

 brownish shading and lies almost touching the postnotum. 



Pleura upper parts brownish, lower gray-black; propleura 

 one bristle, mesopleura bare except about twelve hairs below 

 the disk. Pteropleura bare, sternopleura one strong bristle, 

 the rest entirely covered with long fine black hairs, and bris- 

 tles between the coxae. 



Abdomen red-yellow, blackish in places, all covered with 

 long fine black hairs, segments two to five with distinct apical 

 bristles. 



Legs and coxae red-yellow, fore femora and some tarsi in- 

 fuscated, all covered with long fine black hair, shorter and less 

 on the tarsi. 



Wings hyaline, veins dark. 



Monotype male, 3d May, Cranbrook, British Columbia, 

 3500 feet. 



This species is allied to fraterna and gigas. 



Amoebaleria gigas, new species. 



Length 8 to 9 mm., often 4 to 10. 



Head, antennas, thorax, pleura, abdomen, legs pale red- 

 brown ; front to antennae orange yellow. The abdomen occa- 

 sionally, especially in the female, with blackish gray covering. 

 Arista medium long, black and microscopically pubescent. 

 Vibrissa one strong below, where are three to five rows of long 

 fine hairs to the lower corner ; dorsum with three distinct 

 stripes of red brown, the median one sometimes short, the 

 other two through the base of the dorso-centrals, which may 

 be strong or weak, or one to four. Humeral bristle present 

 or absent. Scutellum with two pairs, often an extra bristle. 



