23 



1747 Thereva flavicauda Coquillet, new species. 



Black, the antennae, leg-s, halteres and apex of abdomen, 

 yellow; apex of antennae brown, coxae, front femora except their 

 apices, and basal half of middle femora black, apices of tarsi brown, 

 a brown spot at bases of knobs of halteres; the yellow of abdomen 

 occurs on hind margins of third, fourth and fifth segments and 

 whole of the portion beyond the latter; front opaque, yellowish gray 

 pruinose, a transverse pair of polished black spots near the middle, 

 the hairs below the latter black, followed by yellowish white ones, 

 like those of the face, first joint of antennae slightly longer than 

 the third, the under side densely yellowish white pilose and bearing 

 a few black bristles, third joint oval, twice as long as wide, about 

 six times as long as the style; thorax bluish gray pruinose, meso- 

 notum marked with two yellowish gray vittae, its hairs chiefly 

 black; abdomen opaque, gray pruinose, the fifth and sixth seg- 

 ments slightly polished, the following two highly polished, hairs of 

 abdomen almost wholly pale yellowish; wings graj'ish hyaline, 

 veins indistinctly bordered with smoky, stigma indistinct, yellowish 

 brown, a dark brown cloud at base of second submarginal cell and 

 of each posterior cell, fourth posterior cell closed or narrowly open. 

 Length 10 mm. Two female specimens. Ormsby County, Nevada. 

 Type No. 6710, U. S. National Museum. 



ACROCERIDAE. 



1748 Ogcodes mei-AMPUS Lw. Ormsby Count}^ Nevada. 



1749 Acrocera bakeri Coquillet, new species. 



Black, the four angles of the thorax, legs and halteres whitish, 

 the prothoracic spiracle and abdomen orange yellow, the latter 

 having the first segment, a fascia on the second expanded on the 

 sides and extending across the venter, a small basal spot in middle 

 of dorsum of the third and fourth segments, a large spot on each 

 side of the third segment extending across the venter, in the middle 

 of which it is greatly expanded, a small spot in basal angles of the 

 fourth segment and a pair of spots on venter of this segment' 

 black; tarsal claws and last tarsal joint except the base, also black; 

 wing hyaline, veins black, calypteres wholl)' whitish hyaline. 

 Length 5 mm. A female specimen. Ormsby County, Nevada. 

 Type No. 6709, U. S. National Museum. 



LONCHOPTERIDAE. 



104 LONCHOPTERA LACUSTKis Meig. Stanford University. 

 985 LONCHOPTERA LUTEA Panz. Stanford University and also in 

 the mountains near Claremont, California (1205). 



