:23o 
DIPTERA 
SuBcGENUS BERGENSTAMMIA, MiK 
Characters. — Pulvilli and empodium vestigial or wanting; face not continued beneath the 
eyes, the lower edge notched in the middle, the cheeks divided by a distinct suture; discal cell blunt - es 
apically, wings not marked; no acrostichals, five or more dorsocentrals, scutellum binc: setulae in 
addition to the apical pair of bristles; large sized species. 
Type species : B. nudifes, Loew, the only one mentioned by Mik. 
A KEY TO THE NORTH AMERICAN SPECIES OF CLINOCERA, S. LAT, 
1. Three submarginal cells present; noacrostichals . . . . . . . . . . . . pu : a e 
Twosubmarginalcells present... 4... 9 4,9 3 8 B vx "ic m 
2. Discal cell usually longer than the second posterior ; 
posterior femora without bristles; thorax bivittate i 
and with a white median vitta, veins undulating .  HyYDRODROMIA UNDULATA, nOY. Sp. (1). z 
Discal cell shorter than the second posterior. . . . . . . s. .. 2 V RAI BT 
3. Wings lightly infumated, no stigma, veins not 
undulating. . . m 20057. 80. CEINOCERA TRUNCA, ov. sp. (3): ; 
Wings marked with iaLdloge Mio LM ul REP iM 
(1) Clinocera (Hydrodromia) undulata, nov. sp. — Male. Length 3 mm. Olivaceous above, cinereous below, : 
thorax narrowly bilineate with brown and centrally in front with a conspicuous cinereous vitta. Lower half of theface 
white, upper part blackish, front olivaceous brown, the vertical bristles strong, cheeks completely separated from the face, 
narrow, palpi elliptical with short sparse black hairs. Five strong dorsocentral bristles, no setulz,, metapleural hairsfine, — — 
dense and yellow, pectus nearly bare. Coxal hairs sparse and yellow, legs black, front tibize as long as their femora, front 
femora with two sparse rows of about eight regularly placed, short setze, hind tibiae with about eight extensor setze on the 
apical half, pulvilli and empodium normally strong and whitish. Halteres black, calypteres dark and with a pale yellow 
fringe. Wings almost hyaline but with broad darker spaces about the crossveins, stigma elliptical, costal setulze small, - 
veins thin but strong, undulating, three submarginal cells, the third twice as long as its costal margin, discal cell longer 
than the brcadly sessile second posterior cell, its outer third with parallel sides, sections af ipe 145 vela eqaiQlni spa: | ; 
recurved, anal vein a weak fold. 
Type, Moscow Mountain, Idaho, July 6, 1912; paratype, same locality, Sept. 16, 1917 (Melander). . 
A female from Mount Rainier, Washington, August 3, 1905, submitted by Professor Aldrich, differs in that the front 
femora lack the flexor bristling, and the darkening of the wings is more extended, the wings being somewhat infumated but 
with subhyaline spaces near the centers of the short cells and near the base and apex of the longer cells. 
(2) Clinocera trunca, nov. sp. — Female. Length 3.5 mm, Black, coated above with greenish and on the sides 
and below with slate-colored pollen; legs black; wings brownish, veins strong. Occiput and vertex greenish, upper part 
of the face concave, dusky, lower part convex, white, separated from the very short dusky cheeks; eyes large; occipital - 
bristles not numerous ; palpi small, black, proboscis very short; antenne black, the third joint short, arista longer than 
the antennz. — Mesonotum completely greenish pollinose, with faint indications of two dark vittze, no acrostichals, six 
uniform dorso-centrals, scutellum with two apical bristles; metapleurze with a few fine white hairs; metanotum slaty blue. 
Legs entirely black, front femora with a few inconspicuous setulae beneath; claws, pulvilli and empodium uniformly small. 
Wings unspotted but lightly infumated, the centers of the cells a little paler, veins strong, nearly black, costa] setulz very 
minute, two submarginal cells, the second somewhat broader at the end than the first, the anterior branch of the third vein - 
imperfect at its origin in the type specimen, gently and evenly sinuous, first and second posterior cells nearly alike at their 
base, the last section of the fourth vein but slightly longer than the front edge of the discal cell, anterior crossvein placed 
at two-fifths the length of the discal cell, the externo-anterior edge of the second basal cell two-thirds the length of the first 
section of the front border of the discal, posterior crossvein elbowed at its posterior third, making nearly a right angle 
with the fifth vein, last two sections of the fifth vein equal, anal crossvein round, separately closing the anal cell, anal vein 
replaced by a fold : halteres black. 
Type specimen collected by Professor J. M. Aldrich at Dewatto, Washington, June 7, 1906. Four paratypes from 
Olga and Friday Harbor, Washington, May and June, differ in having three submarginal cells. However, in two of these 
specimens there are three submarginals in one wing and two in the other, A poorly preserved specimen in the National 
Museum, from Ungava Bay, Hudson Strait, having three submarginal cells, differs in that the legs are brownish instead of 
fully black. 
"This species agrees fairly well with Walker's brief description of longifes, except for the decidedly brown and not gray 
color of the wings and the lack of gray pollinosity of the legs. Osten Sacken suggested that Walker's species is the same 
as Loew's simplex, but the latter has the mesonotum evittate, 
