218 DIPTERA 
5. GENUS CERATEMPIS, NOv. GEN. 
Characters. — Male. Head spherical, eyes round, low-set, obliterating the cheeks, widely 
separated on both front and face, facets nearly uniform and rather large; a single orbital bristle opposite 
antennz, ocelli large, ocellar bristles pronounced, upper occipital bristles well developed; first antennal 
joint cylindrical, twice as long as wide, with a few apical setulae above, second joint globose, with a 
whorl of setulze, third joint excessively long, being twice as long as the head, very slightly tapering to 
the blunt tip, heavily pubescent; proboscis minute, fleshy, palpi single-jointed, directed forward and 
bearing two inferior setula. 
Thorax normal, the notal bristles well developed, including one humeral, post-humeral, presutural, 
notopleural, two intraalar, one postalar, a complete row of dorsocentral and apical scutellar pair, 
metapleurz with a vertical row of five setulze. 
Abdomen loosely setose, not pitted, showing six compressed segments, the genitalia erect, with 
narrow central piece, the base of which is overlaid by a pair of downward extending flat valves, dorsal 
valves narrow erect, and penis slender deformed and projecting; seventh tergite of female fringed with 
close-set blackish setze, the corresponding sternite long and narrow, ovipositor short and stubby, ending 
in two small erect hooks. 
Legs slender, coxc loosely setose, remainder of legs with usual covering, no bristles other than a - 
flexor grouping of stiff setulz teward tip of middle tibiz» and a single small flexor bristle at apex of front. 
tibiz; tarsi somewhat longer than their tibiz; pulvilli small, empodium microscopically setiform. 
Wings broad, hyaline, veins yellowish, costa encompassing wing, fringed with marginal hairs, 
no stigma, auxiliary vein complete, ending in costa opposite fork of third vein, second vein long, ending 
near tip of wing, third vein forked, discal cell complete and rather large, emitting three posterior veins, - 
anal crossvein perpendicularly recurved, rounding into the anal vein which continues only as a fold of 
the membrane beyond the anal cell. 
Genotype : The following new species, which is of very delicate structure. 
Geographical distribution. 
1. C. longicornis, nov. sp. (1). — PI. 3, Fig. 22. Washington. 
6. GeENus TRICHOPEZA, RONDANI 
Trichopeza, Rondani, Dipt. Ital. Vol. t, p. 150 [1856] (Tricopesa); Schiner, Fauna Dipt. Austr. 
Vol. 1, p. 86 (1862); Róder, Wien. Ent. Zeit. Vol. 6, p. 169 (1887); Bezzi, Ann. Soc. Ent. 
France (6), Vol. 9, p. 121 (1889); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 258, 261 (1903); 
loose setze along margin, male terminal processes testaceous, with black tip, penis testaceous, its tip deflected posteriorly, 
other pygidial parts piceous. Coxze brownish yellow, legs piceous brown, the front knees a little lighter, middle tibize of 
male with small thorn-like seriate flexor spines extending between middle and apex. Wings infumated, veins dark brown ; 
calypteres and halteres yellow. 
One male and twenty-five females, found by the author principally about the rills formed from melting snow on the 
Sluiskin slope above Paradise Park, Mount Rainier, Washington, August, 1917. Of the type lot single specimens were 
found along Van Trump Creek and on Eagle Peak, both localities also on Mount Rainier. 
(1) Ceratempis longicornis, nov. sp. — Male. Length 2.8 mm. Entirely yellow, largely shining, the third 
antennal joint black, the ocellar spot and last tarsal joint blackish, Pubescence of third antennal joint gray, bristles 
of body black, hairs of legs dark. Upper valves of pygidium with black hairs, a pair of stiff black backward- 
directed setze arising from near middle of pygidium, the flaring lower valves covered with downward-directed hairs. 
Female, "Third joint of antenne a little shorter than in the male. 
Eight specimens, Nasel River, and Ilwaco, in Southwestern Washington, July (Melander). 
