100 DIPTERA 
6. Hind coxe with long sete — gi to end of trochanters; 
females yellow . . . -.« 5. . OO. HETEROGAMUS, nov. sp. Q). 
Setz of hind coxee much Midder eld iles us blackish. ^O. oBscunus, Loew. 
Geographical distribution. 
1. O. basalis, Loew, Neue Beitr. Dipt. Pt. 4, p. 36 [1856] (Gloma); Schiner, C. Europe. 
Fauna Dipt. Austr. Vol. t, p. 112 (1862); Becker, Berl. Ent. : 
Zeitschr. Vol. 31, p. 133 (1887); Strobl, Mitteil. Naturw. Ver. - 
Steiermark, Graz, Vol. 29, p. 87 (1893). — PI. 5, Fig. 50. 
2. O. capnofterus, nov. sp. | . W. North America. 
3. O. cyméallista, nov. sp. British Columbia. 
4. O. heterogamus, nov. sp. : Oregon. 
5. O. mitrephorus, nov. sp. (Pl. 6. Fig. 51). : Idaho. 
6. O. obscurus, Loew, Berl. Ent. Zeitschr. Vol. 8, p. 84 : Cent. Vol. 5,p.63 E.UnitedStates; KSUEO 
(1864](Gloma); Coquillett, Proc. Wash. Acad. Sc. Vol. 2, p.412 [1900] 
(Gloma); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 276, f. 93 
[1902] (Gloma) ; Coquillett, Harriman Exped. Vol. 9 (2), p. 26 [19094] 
(Gloma) ; Bezzi, Ann. Mus. Hungar, Vol. 3, p. 451 (1905). 
7; O.rufus, Loew, Berl. Ent. Zeitschr. Vol. 8, p. 84 : Cent. Vol. 5, p. 67 E. United States. 
[1864] (Gloma) ; Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 275 
[1902] (Gloma) ; Bezzi, Ann. Mus. Hungar. Vol. 3, p. 451 (1905). 
8. O. scopifer, Coquillett, Proc. Wash. Acad. Sc. Vol. 2, p. 412[1900] (Gloma); Alaska. 
Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 276 [1902] (Gloma); 
Bezzi, Ann. Mus. Hungar, Vol. 3, p. 451 (1905); Coquillett, Har- 
riman Exped. Vol. 9 (2), p. 26 [1904] (Gloma). 
7T. GENUS APALOCNEMIS, PHILIPPI 
Apalocnemis, Philippi, Verh. Zool.-bot. Ges. Wien, Vol. 15, p. 752 (1865); Bezzi, Ann. Mus. Hungar, 
Vol. 3, p. 424, 451 (1905); Bigot, Ann. Soc. Ent. France (6), Vol. 9, p. 117 (1889); Melander, 
Williston, Man. N. Amer. Dipt. p. 226 (1908); Bezzi, Nova Acta Akad. Naturf. PADO: Vol. 9t, 
p. 3o2, 383 (1909); Kertész, Cat. Dipt. Vol. 6, p. 111 (1909). 
Characters. — Small reddish or blackish species measuring three to five millimeters. Head 
globose, occiput hairy, eyes of the male contiguous on the front; antennz short, basal joints brief and 
riearly bare, third joint rotund and short, with a lengthened terminal arista which is obviously longer 
than the antenna and has a distinct basal segment and an apical seta; proboscis very short, horizontal 
but not protruding beyond the oral margin, palpi large and briefly hairy. Thorax strong, bristly, a 
cluster of humerals, several notopleural, scutellar and supra-alar bristles, acrostichals short or long, 
dorsocentral series complete, the posterior bristles long; pleure bare. Abdomen rather cylindrical, 
pygidium small, bearing four small dorsal appendages. Legs slender, simple, short-hairy, only the male 
(1) Oreogoton heterogamus, nov. sp. — Male. Length 5.5 mm, Head and thorax black, second and 
third abdominal segments pellucid yellowish. Last two tarsal joints black, of the anterior legs slightly expanded 
but not pennate; middle femora with four long flexor setze near middle, then a short interrupted space followed by 
Íour seriate setz toward knee; middle tibi; bent at middle and with a few erect flexor setulae at two-thirds the 
length, exteriorly with two setze; apical setz' of hind coxe long, curved, reaching nearly to end of trochanters ; 
hind femora ciliate above and below with fine sete. Wings with light yellowish tinge, third vein bare, The ! 
thoracic bristles are long. 
Female, Occiput, front, third antennal joint and last two tarsal joints black, remainder testaceous yellow, 
abdomen light brown on apical one-half, the ovipositor yellowish, Specialized leg bristles absent. Third vein setulose. 
Two males, three females. Near the mouth of Eagle Creek, Cascade Mountains, Oregon, July rz, 1917 (Melander). 
