FAM. EMPIDID/E 53 
3. Abdomen of male silvery pruinose; hairs of legs and pygidium pale. (Or., 
| GET ORO) cR rs pon UD o p ic me 5 B. ARGYRIA OV. SD. 
: Abdomen black ; hairs of legs and odiituin black. (N. Mex. j -0. 0.5. E. APERTA, Melander. 
4. Hind femora apically blackened and with flexor thorns near the knee; 
halteres of male with dark knob;third antennal joint short and broad, 
EEEOMGSBORNPLO. 10 508 o3) mac eda QR 2 c t e HI BPINIBES, DOV. SD. 
Hind femora not blackened about the knee nor withthorns . . . . . . . . . . « « 3. 
5. Stigma, veins, thoracic bristles, halteres and tarsi blackish; third antennal 
joint more than twice as long as wide. (Wash.). . . . . . . . E. MATURA, nOY. Sp. 
Stigma, veins, halteres and tarsi pale; third antennal joint less than twice 
as long as wide. (Ont., Mass., N. H., Pa., Md., Mich., Wisc., Mo.,Ida.) E. suciNATOR, Melander. 
Geographical distribution. 
1. E. aperia, Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 348 (1902); New Mexico. 
Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 263 [1903] (Microphorus). 
2. E. argyria, nov. sp. (1). Idaho, Oregon. 
3. E. brevipes, Loew, Bemerk. Posen. Gegend Art. Zweifl. Gatt. 1840, p. 22, C. Europe. 
f. 28-30 [1840] (Hemerodromia), Oken, Isis, Encycl. Zeitschr. Leipzig, 
Vol. 7, p. 550. f. 28-30 [1840] (Hemerodromia) ; Wien. Ent. Monatschr. 
Vol. 8, p. 255 [1864] (Hemerodromia). 
gracilipes, Schiner, Fauna Dipt. Austr. Vol. 1, p. 83, no desc. [1862] (Heme-: 
rodromia). 
4. E. bucinator, Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 348 (1902). North America. 
5. E. crocola, Coquillett, Proc. Wash Acad. Sc. Vol. 2, p. 413 [r9oo] Alaska. 
(Microphorus); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 257 
(1902); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 263 [1903] 
(Microphorus). 
6. E. Gyllenhali, Zetterstedt, Fauna Ins. Lappon. p. 538 [1838] (Authalia; NN. and C. Europe. 
Dipt. Scand. Vol. rz, p. 249 [1842] (AntAalia), Vol. 8. p. 2998 [1849] 
(Authalia); Scholz, Zeitschr. Ent. Breslau. Vol. 5, p. 19, 5o [1851] 
(Anthalia); Schiner, Fauna Dipt. Austr. Vol. r, p.79 [1862] ( 4nzhalia); 
Lundbeck, Dipt. Dan. Vol. 3, p. 211, f. 86, 87 (1910); Wahlgren, 
Ent. Tidskr. Vol. 31, p. 80 (1910); Frey, Acta Soc. Sc. Fenn. Hel- 
singfors, Vol, 37 (3), p. 60 (1913). 
7. E. immatura, Zetterstedt, Dipt. Scand. Vol. 13, p. 2001 (1859). Scania. 
8. E. matura, nov. sp. (2). Washington. 
(i) Euthyneura argyria, nov.sp. — Male. Length2 mm. Black, abdomen silvery pruinose, legs brownish. 
Upper facets larger than lowermost ; proboscis porrect, nearly as long as height of head, palpi small and black; antenne 
with third joint compressed, conical, Arica as long as deep, with fine white pubescence, style one-fourth as long as the third 
joint. Thorax polished, slightly dusted in front of wings, its sparse hairs and fine bristles white, six scutellars. Abdomen 
with long loose white hairs, the narrow sternites not pruinose, pygidium minute. Legs simple, hairs pale. Halteres white. 
Wings opalescent, veins white, stigma almost obsolete, discal cell open apically, the fourth vein forked midway its length. 
Female. Front broad, at ocelli wider than length of third antennal joint, facets uniform ; bristles and veins 
yellow, wings not opalescent ; abdomen not pruinose, 
Seven specimens. Mt. Hood, Oregon, elevation 6000 feet, July 3o, 1922; Moscow Mountain, Idaho, June 29, 1918 
(Melander); Colorado (F. C. Baker.) 
(2) Euthyneura matura, nov. sp. — Male. Length 3 mm. Black, legs brownish, veins and stigma strong. 
Upper facets large ; third antennal joint long, bluntly lanceolate, two and one-half times long as deep, velvety with 
microscopic pale hairs, style minute one-third as long as width of third joint ; proboscis projecting obliquely forward 
nearly as much as head-height, palpi slender and black. "Thorax polished, sparingly, pollinose above the notopleural 
suture and posteriorly, the fine scattering hairs and the bristles blackish, six scutellars. Abdomen shining black, its 
hairs pale at base and black at apex, pygidium small.  Coxe and legs yellowish brown, the posterior tibize and all 
