THE CANADIAN ENTOMOLOGIST 361 



posterior spiracle either entirely dark brown or with yellowish 

 tips, those of spiracular cover vary from brown with yellow tips 

 to almost wholly yellowish. Epaulets dark. 



Wings — Bend of fourth vein normally a strongly acute angle; 

 anterior cross- vein more basal than end of first longitudinal; 

 third vein bristly; costal spine vestigial; section III of costa equals 

 approximately one and two-thirds times section V; posterior 

 margin of alute with or without fringe of hair; calypters whitish, 

 fringe of hairs dark, otherwise whitish, but those on inner portion 

 of margin of upper (anterior) calypter often dark. 



Legs — Dark; all tarsi shorter than their respective tibi?e. 

 Posterior trochanter with well defined "brush," especially in large 

 specimens: femur sub-cylindrical, clothed beneath with long hair 

 that often becomes beard-like posteriorly ; anterior face with three 

 rows of bristles, those of intermediate row shortest and not de- 

 veloped distally; posterior face without ventral row of bristles; 

 tibia sometimes slightly curved, anterior and posterior faces each 

 with an equally strong beard of long, coarse, black hair: fourth 

 segment of tarsus at least one-half fifth. Middle coxa with a single 

 row of bristles: femur clothed beneath on posterior proximal 

 half or more with long hair; anterior ventral row of short bristles 

 complete, posterior row represented only by "comb" extending 

 proximally to the long hair : hairy vestiture of lower surface of 

 tibia increasing in length distally but short and not forming an- 

 terior and posterior beards; submesotibial bristle present. Ventral 

 surface of anterior coxa completely clothed with bristles that are 

 sometimes separable into three irregular rows, one at each side 

 and an intermediate that is usually less complete and sometimes 

 indistinct. 



ChcEtotaxy — Anterior dorsocentrals short, slightly longer than 

 vestiture of praescutum but slightly reclinate and not projecting 

 above it; acrostichals absent; inner presuturals, if present, very 

 weak: last two pairs postsutural dorsocentrals strong, anterior 

 to these three or four pairs that are weaker than those before 

 the suture; pra^scutellar acrostichals present: scutellar apicals 

 present: usually three sternopleurals, sometimes two but generally 

 only on one side: lower sternopleura with a single row of bristles. 



