54 DIPTERA 
9. E. myrtilli, Macquart, Ann. Soc. Ent. France (1), Vol. 5, p. 519, pl. 15, A, N. and C. Europe. 
Í 1-4 (1836); Walker, Ins. Brit. Vol. 1, p. 111, pl. 4, f. 3 (1851); 
Schiner, Fauna Dipt. Austr. Vol. r, p. 82(1862); Loew, Syst. Beschr. 
Vol. 2, p. 251, note 2 (1871); Beling, Arch, Naturg. Berlin, Vol. 48, 
p. 234 (1882); Strobl, Mitteil. Naturw. Ver. Steiermark, Graz, 
Vol. 29, p. 96 (1893); Wahlgren, Ent. Tidskr. Vol. 3r, p. 80 (1910); 
Frey, Acta Soc. Sc. Fenn. Helsingfors, Vol 37 (3), p. 61 (1913). — 
PI. 8, Fig. 82. 
albipennis, Zetterstedt. Dipt. Scand. Vol. r, p. 250 (1842). 
var. incompleta, Strobl. Mitteil Naturw, Ver. Steiermark, Graz, Vol. 34, p. 208 C. Europe. 
(1898). 
10. E. simillima, Strobl, ibidem, Vol. 29, p 97(1893), Vol.34, p. 208(1898). C. Europe. 
II. E. spinipes, nov. sp. (1). Western North America. 
2. GENUS TRICHINA, MEIGEN. 
Trichina, Meigen, Syst. Beschr. Vol. 6, p. 335 (1830), not Owen [1835] (Nemathelminthes), not Kirby, 
[1837] (Coleoptera); Zetterstedt, Fauna Ins. Lappon. p. 539 (1838); Rondani, Dipt. Ital. Vol. r, 
p. 152 (1856); Loew, Zeitschr. Ent. Breslau, Vol. 17, p. 35 (1864); Coquillett, Proc. Ent. Soc. 
Wash. Vol. 5, p. 258 (1903); Melander, Williston, Man. N. Amer. Dipt. 3 ed. p. 225 (1908); 
Kertesz, Cat. Dipt. Vol. 6, p. 100 (1909); Lundbeck, Dipt. Dan. Vol. 3, p. 184 (1910); 
Wahlgren, Ent. Tidskr. Vol. 3r, p. 43, 77 (1910). 
Characters. — Small, slender, shining or subshining black species. Eyes of the male broadly 
contiguous above the antenne, subcontiguous on the face, the upper facets large, of the female narrowly 
separated on both the front and the face; oral opening small and not encroaching on the face, proboscis 
very small, vertical, not protruding, palpi short and with a subapical hair; antennze located near the 
middle of the head, elongate, imperfectly three-jointed, the last joint elongate, rather slender and tipped 
with a short two-jointed style; vertical and ocellar bristles small. Thorax moderately arched, bristles 
fine but rather long, humeral, posthumeral, notopleural, dorsocentral and scutellar bristles present, 
tarsi blackish, hairs of femora and tibia pale, no bristles. Halteres blackish, Wings hyaline, stigma pronounced but 
not at all filling end of marginal cell, veins strong and brown, discal cell broad and short, the sections of the 
fourth vein proportioned about 5 : 1 : 5 : 7, intercalary vein weak at tip. : 
Seven specimens, all males, from Valleyford, Wash.,. 19 June 1919. 
(1) Euthyneura spinipes, nov. sp. — Male. Length 2.2 mm. Body polished black, its sparse hairs and 
bristles yellow, legs including the coxe pale yellow, the distal third of the hind femora, tibiz and tarsi blackened, 
the hind femora apically black-setose. Upper facets large ; antennz black and pubescent, the third joint broadly oval, 
one-third longer than wide, the underside apically concave, the style one-third as long as the third joint ; proboscis 
projecting obliquely forward about as far as the length of the head, palpi shining and furnished with a few long 
black hairs ; occiput very lightly dusted, its sparse hairs black. Scutellum with four bristles. Hairs of the abdomen 
sparse and pale, pygidium minute. Hairs of the legs pale. extensor cilia of the hind femora equal to the diameter 
of the femur, about five black thorn-like sete; before the knee on the anterior side ànd three on the posterior side 
beneath. MHalteres blackish. Wings slender, veins narrow and dark, a diffused stigma around the end of the first 
vein, discal cell as long às the wide second basal, emitting three complete posterior veins, its basal crossvein nearly 
perpendicular, sections of the fourth vein proportioned 1i : 0.2 : 0.9 : 1.2, of the fifth vein, 1 : 0,5 ; 0.9 : 0,8, anal 
vein faint. 
Female. Eyes separated, facets uniform; proboscis more nearly vertical; abdomen with conical apex, the 
last segment forming a lenythened ovipositor ; halteres pale yellow. 
Numerous specimens, Moscow Mountain and Lookout Mountain, Idaho, June, July; Mount Spokane, Washington ; 
one specimen, Kaslo, British Columbia (U. S. N. M.). The species is distinct from bwcinator, with which it cohabits, 
by the color and spines of the hind legs. "The latter species is closely related to myrtilli, but has a shorter third antennal 
joint, Western specimens of bwcinator have the hairs and bristles of the thorax invariably yellow, in Eastern speci- 
mens the bristles are almost always black. 
