418 THE NORTH AMERICAN EMPIDM—COQUILLETT. vol.xviii. 



115. A'ein between discal and second posterior cells distinct 116 



Vein between these cells faint or Avautiug, legs destitute of erect scales, 



pile of pleura and abdomen whitish ; length, 3 mm aperta. 



116. Hind and other femora destitute of erect scales 117 



Hind femora bearing nearly erect scales on the under side, pile of body 



black ; California species ; length, 8 mm sudigeronis (p. 431). 



117. Pil&and bristles of thorax, pleura, and abdomen black; legs bearing long 



bristles ; length, 3 mm '. . jj/zc j«»«s. 



Pile and bristles whitish or yellow, legs destitute of long bristles; length, 



4i mm (lUvipdosa (p. 434). 



lis. Males ; eyes contiguous 119 



Females 120 



119. Abdomen de^jressed, tilament of hypopygium yellow, free excepting the tip, 



suddenly narrowed at its first third ; length, 3i nun iusecta (p. 426). 



Abdomen coui])ressed, filament black, hidden, excepting the base; length, 



5i mm vnihrosa. 



120. Hind and middle femora bearing nearly erect scales 121 



Hind and other legs destitute of scales 124 



121. Front legs destitute of scales '. 122 



Front legs bearing nearly erect scales, third autennal joint broad; length, 



6 mm mallos. 



122. Hind tibia; bearing nearly erect scales 123 



Hind and other tibiie destitute of scales, abdomen depressed, subopaque; 



California species ; length, 5 mm , (htpUris (p. 424). 



123. Middle tibiae and under side of middle femora bearing nearly erect scales, 



style of antennte minute, proboscis slightly longer than height of 



head, abdomen subshining; length, 4 nun corrina. 



Middle tibifp and under side of middle femora destitute of scales, abdomen 



shining ; length, 5 mm hvvigaia. 



124. Abdomen depressed, attenuated posteriorly, wings grayish toward apex; 



length, 3inun insecta (p. 426). 



Abdomen compressed, sub truncated at apex, Avings uniformly brown toward 



the apex: length, 5^ mm u)iihrosa. 



RHAMPHOMYIA RAVIDA, new species. 



Male. — Head black, grayish-brown polliiiose, eyes very narrowly 

 separated, the interval being narrower than the lowest ocellus; facets 

 of nearly a uniform si/e; autenna^ black, the third joint lanceolate; 

 style over one-third as long as the third joint; proboscis slightly longer 

 than the head, palpi dark yellowish. Thorax, pleura, and scutellum 

 black, opaque, grayish brown pollinose; thorax marked with three dark 

 brown vittw, its pile rather abundant and quite long, whitish, or 

 brown, and black; pile above front cox.e yellowish, that in front of 

 halteres yellowish or black; scutellum bearing about fourteen marginal 

 bristles; abdomen depressed, black, opaque brownish gray pollinose, 

 its pile quite abundant and long, yellowish and black; on each side of 

 the seventh segment is a shining black vitta, marking the division into 

 two parts of the dorsal and ventral portions of this segment, the vittae 

 being on the lower half; hypopygium rather large, ascending; filament 

 hidden, except the posterior side of its lower third. Coxa; and tro- 

 chanters black, gray i)(>llinose, sometimes yellowish at apices; femora 



