Vol. IX] COLE & LOVETT—NEIV OREGON DIPTERA 251 



40. Criorhina tricolor Coq. (Lovett) 



Mt. Jefferson, July- August, 1907 (Briclwell) and August 

 15 (Lx>vett) ; Hood River, June 17 (Cole). I find the descrip- 

 tion as given by Coquillett faulty and from a total of 25 speci- 

 mens would redescribe as follows : 



Female : Face shining black ; base with hint of golden pollen ; light yel- 

 low pile along eye margins ; front and face form practically a straight line 

 to obtuse tubercle, the antennal prominence rising rather abruptly, only 

 moderately produced ; from tip of tubercle to oral margin a straight re- 

 tracted line, oral margin in line with front ; cheeks, occiput, front and vertex 

 with light golden yellow pile; across vertex just back of ocelli with trans- 

 verse row of black pile ; front and vertex shining black, with brassy reflec- 

 tions ; antennae brown ; first segment shining, twice as long as second ; 

 second dull; third light brown, darker on outer angle, thinned, nearly as 

 long as first and twice as broad as long, obtusely rounded on inner angle, 

 prolonged on outer angle to form an obtuse point; arista dark brown 

 located near point of projecting outer angle. 



Thorax shining black, grey pruinose and yellow pilose anteriorly, black 

 pilose posteriorly; on grey pruinose field are two median lines joining the 

 shining posterior portion and two side spots projecting forward into 

 pruinose field but not reaching anterior margin ; often these side spots are 

 circular and surrounded by the pruinose field; scutellum black wth brassy 

 reflections, pile elongate, light yellow. 



Abdomen : First segment black with brassy reflections and rendered sub- 

 opaque by grey pollen; second segment similar on disc; subshining on 

 lateral angles, pile here elongate light yellow ; hind margin of second and 

 succeeding segments shining black; pile moderately elongate and ex- 

 tremely variable in color ; generally bright brick-red on disc of third, black 

 laterally, fourth segment with light yellow pile. 



Legs black, knees and middle tibiae light brown, front and hind tibiae and 

 all tarsi dark brown; middle and hind coxae with heavy tuft of black 

 bristly hairs ; pile on front femur light yellow, on middle femur mixed with 

 black, on hind femur all black ; tibiae and tarsi with short golden pile. 



Wings smoky; a distinct cloud at base of stigma extending to spurious 

 vein ; veins dark brown, lighter on proximal third ; squamae grey, margin 

 black, with black bristly hairs ; halteres dark brown. 



Male : Face opaque black, densely covered with silvery pollen, more 

 deeply convex below antennae ; front and vertex shining, with dark brown 

 and black pile. Abdomen : First segment and second on proximal two- 

 thirds sub-opaque black with brassy reflections, the grey pollen so dense as 

 to give appearance of yellow ; pile on second segment elongate yellow ; 

 distal third of second segment and succeeding segments shining black ; this 

 portion of second and all of third with moderately short coarse black pile ; 

 terminal segments golden pilose. Tufts of pile at base of coxae light 

 yellow. Otherwise as female. 



There is considerable variation in the color of the pile of the 

 abdomen and to a lesser extent in the density of the pollen on 

 the proximal segments, but the general characters are very 

 specific. 



