360 THE CANADIAN ENTOMOLOGIST 



( 9 ) Third anlennal segment two to three times length of 

 second; anterior portion of cheek clothed with black, posterior 

 with whitish hair; hairs fringing calyptcrs dark at fold, otherwise 

 whitish except that those on inner portion of margin of upper 

 (anterior) cahpter are often dark; ventral surface of anterior 

 coxa witii other l)ristles than those of the irregular rows at each 

 side, sometimes more or less distinct row between them; only 

 last two pairs of posterior dorsocentrals strong; abdomen clothed 

 with short, reclinate bristles; genital segments slightly protuberant; 

 the two broad, lateral lips of the first genital segment dull orange, 

 near their edges usually turned abrupth' backward (more 

 protuberant), spiracles nearest to anterior margin: fifth segment not 

 discernible, its spiracles when visible seem to open through lips of 

 notum sixth (first genital segment) ; ventral plates of genital 

 segments usually concealed. 



Length — 9 to 15 mm., average 12 to 14 mm. 



(d^) Head — X'iewed from side parafrontals and gena?, with 

 dark refiections. Breadth of front at narrowest part from one- 

 half to four-se\enths eye width; cheek height varies from one-third 

 to one-half that of c\e. Front rather prominent, sides of frontal 

 vitta usualh' parallel but often slightly convergent backward 

 or the sides effaced just below ocellar triangle (especially in large 

 specimens). Second antennal segment brownish at tip, rarely 

 blackish throughout'; third two and one-half to three and one-half 

 times length of second, its inner, basal portion often pinkish or 

 salmon-coloured; arista plumose to beyond the middle. Back 

 of head somewhat convex, typically with two complete rows of 

 black cilia beyond eyes, sometimes with a partial third especially 

 dorsally, otherwise clothed with whitish hair that completely 

 covers metacephalon. Anterior portion of cheek clothed with black, 

 posterior with white hair. Gena sparsely clothed with short 

 hair or sometimes with three irregular rows on that half nearest 

 eye orbit. 



Chcctotaxy — Later<»l verticals absent; vibrissas inserted just 

 above line of oral margin. 



TJwrax—'Metanotum clothed with short, quite erect, close 

 set bristles. Hairs covering anterior spiracle dark brown basally, 

 at least their outer halves yellowish; those of anterior margins of 



