Vol. IX] COLE & LOVETT—NEW OREGON DIPT ERA 245 



Also in certain lights there is a hint of a broad uninterrupted 

 fascia on the third and fourth segments. This offers the sur- 

 mise that it might be a melanic form of some common species, 

 as occurs in L. pyrastri. An attempt so to classify it was fruit- 

 less; also, were this the case, one might expect the pile over 

 these obscured bands to remain light. It is throughout, how- 

 ever, a coarse short black pile warranting the assumption that 

 the bands are actually obsolete. 



33. Syrphus pacifica Lovett, new species 



Length 7 to 8.5 mm. Eyes moderately white pilose; face 

 greenish yellow with blackish pile ; a broad median shining black 

 stripe from oral margin to near base of antennas ; oral margin 

 and cheeks shining black; front and vertex shining greenish 

 black with elongate black pile ; dorsum of thorax deep shining 

 black with greenish reflections and moderately elongate black 

 pile; scutellum translucent brown with black pile; abdomen 

 shining black with three interrupted arcuate cross-bands not 

 reaching the lateral margins; legs brown; basal two-thirds of 

 femora and coxae black ; wings smoky ; stigma light brown. 



Male : Antennae small, brownish ; all three segments black above, brown 

 below; third segment small, rounded; arista black, basal, bare; frontal 

 triangle moderately swollen, shining greenish black with elongate black 

 pile ; face almost vertical from slightly raised antennal prominence to 

 obtuse tubercle, not projecting; the median stripe moderately broad with 

 tinge of brown; occiput below with golden pile, on upper two-thirds with 

 coarse black pile. 



Abdomen shining black with three interrupted greenish yellow cross- 

 bands, one near middle of second segment, approximating in form an 

 elongate triangle with a straight outer edge not reaching the lateral margin ; 

 on third and fourth segments the cross-bands are arcuate, convex in front, 

 almost straight behind, their outer ends crescentic, the inner broadly 

 separated and rounded ; posterior margins of fourth and fifth segments 

 greenish yellow, not reaching lateral margin ; pile of abdomen coarse, 

 moderately elongate, black, light golden on cross-ljands. 



Legs brown, basal half of front and middle and basal two-thirds of hind 

 femora and all coxae shining black; wings smoky brown, veins blackish, 

 stigma brown. 



Female : Similar to male. Front with broad pruinose cross-band, pile 

 of face light yellow ; pile on margin of cheeks and occiput light yellow to 

 wihite ; without tufts of black bristly pile on post-alar callosities ; scutellum 

 dark with deep brown reflections, pile except at margin color of that on 

 thorax ; abdominal markings similar, the yellow bands slightly narrower ; 

 pile shorter and more sparse than on male, elongate white on lateral mar- 

 gins of second segment ; wings hyaline. 



