Vol. IX] COLE &■ hOVETT—NEW OREGON DIPTERA 247 



Male : Eyes with elongate white pile, with yellow reflections in certain 

 lights ; vertex black with elongate white pile mixed with black, produced 

 along margin of occiput ; front shining, somewhat swollen ; pile elongate, 

 black on antennal prominence, light above ; antennae short, segments ap- 

 proximately of equal length, third rounded ; arista stout, basal, about as 

 long as antennae ; antennal prominence produced, face and front slope 

 straight away from this point; face elongate, light pilose. 



Thorax and scutellum with elongate silvery pile with yellowish reflec- 

 tions. 



Abdomen where shining has bluish reflection; second segment with 

 opaque band on anterior and posterior margin, produced in middle to meet 

 narrowly, leaving shining portions as quadrangular areas with rounded 

 corners; segment narrowly shining on posterior margin; third segment 

 with opaque bands anteriorly and posteriorly, not reaching margin and but 

 slightly produced in middle; fourth segment with opaque band near front 

 margin not reaching lateral margins, otherwise shining; sparse white pile 

 except on opaque portions where pile is black; legs black, white pilose; pile 

 on tarsi with golden reflection ; wings smoky ; halteres with v^^hite knob. 



Holotype (No. 504), male, in Museum of the California 

 Academy of Sciences, collected at Hood River, Ore., May 8, 

 1917,byF. R. Cole. 



Two male specimens taken, vary from 7.5-9 mm. 



Near californica, differs in size, shape of antennae, wing 

 venation and color of legs. 



36. Platychirus frontosus Lovett, new species 



Head, thorax and scutellum shiny black with black hairs; 

 legs black, front femur with large tuft of black elongate spine- 

 like hairs on proximal third. Length 8 mm. 



Male : Face broad, greenish black, shining, with hint of brownish pollen ; 

 frontal triangle same color without pollen, unusually broad and decidedly 

 swollen ; vertical triangle black, shining, considerably swollen ; ocelli brown ; 

 face, front and vertex with moderately long black pile; on lower occiput 

 pile whitish ; antennae black, third joint nearly twice as long as wide, dark 

 brown, lighter basally below ; arista black. 



Thorax and scutellum green-black, sihining ; no pruinose spots on sternum 

 or pleura, pile black. 



Abdomen opaque black; first segment subshining, outer angles with 

 bronze reflections ; second, third, and fourth with pruinose bronze spots. 

 On second segment the bronze spots on lateral margins extend from anterior 

 margin back for distance of two-thirds of segment. On third and fourth 

 segments the spots are deeper, shorter, on anterior third of segment, reach 

 lateral margin but do not touch anterior margin of segment. Fifth seg- 

 ment as first. Pile black on opaque areas, white on bronze areas and along 

 lateral margins. 



Legs : Fore legs light brown, tibiae yellow, darker at tip ; front tibiae 

 gradually dilated, convex on outer angle below, gently concave on inner 

 side ; tarsi strongly dilated, gradually narrowed from base to tip ; femur with 

 three white hairs at extreme base, then a heavy brush of black pile, most 

 conspicuous at base but extending over proximal third of segment; middle 



