IIO DIPTERA 
I3. GENUS PHILETUS, NOV. GEN. 
Characters. — Black opaque species with slender blacklegs. Head produced obliquely down- 
ward, the antennz placed low and the ocelli far forward ; eyes of both sexes widely separated, bare, facets 
almost uniform; sides of the short front slightly diverging behind, two pairs of small fronto-orbitals, face 
square then receding as the slightly longer epistome; antennz shorter than the head, the first joint 
minute, the second joint globular and with minute setulrze, the third joint ovate-conical ending in a short 
thick arista whose short basal segment is one-fifth as long as the subulate distal portion; proboscis one- 
half as long as the head, extending downward and slightly forward, the labrum needle-like, the labium 
fleshy, palpi short and rather spatulate; hairs of the occiput sparse, becoming gradually stonger above, 
one pair of parallel ocellars and one of diverging post-ocellars. About eight pairs of dorsocentrals, one 
humeral, two posthumeral, three notopleural, two supra-alar and four scutellar bristles; pleure bare but 
entirely pruinose. Abdomen slender, one-half longer than the thorax, second segment with a double: 
transverse row of pittings and the second to the sixth segments with two pits on each side; pygidium 
large, globose, terminal, dorsal valves long, narrow, and recumbent, upper lateral valves deeply and 
horizontally cleft from the convex sides, ventral part not compressed, bearing the short curved slender 
penis; abdomen of the female entirely tapering, ending in two styles. Legs slender, simple, not bristly, 
pulvilli small. Wings with nearly parallel sides, slightly broadest beyond the middle, two and two- 
thirds times as long as broad, anal angle broadly rounded, costa continuing around the entire wing, 
basal bristles small, auxiliary vein distinct, complete, ending in the costa at two-fifths the length of the 
wing, third vein arising at one-third the distance between the humeral and anterior crossveins, its distal 
fork rather large, first basal cell a little longer than the second and as long as the discal cell, sections of 
the fifth vein equal, anal crossvein abruptly recurved, confluent with the underside of the anal cell but 
reaching only one-fourth the distance back, anal vein obsolete, no alula; calypteres with a straight edge 
and the usual fringe. 
Type species : PA. memorandus, nov. sp. Two subalpine North American species have been 
discovered by the author. 
Geographical distribution. 
1. Ph. memorandus, nov. sp. (1). — Pl. 7, Fig. 66; PI. 8, Fig. 78. W. United States. 
2. Ph. schisophorus, nov. sp. (2). — PI. 8, Fig. 8l. Washington. 
(1) Philetus memorandus, nov. sp. (PI. 7, Fig. 66; PI. 8, Fig. 78). — Male. Length2.75 mm. Black, 
the front, face, pleurze and abdomen cinereous pollinose. Third joint of the antennze two and a half times as long as wide, 
the arista two-thirds as long as the third joint; mouthparts black, face square. Dorsum of the thorax olivaceous brown. 
Hairs of the first segment of the abdomen rather dense, pygidium black, coated with gray villosity, the two upper pairs 
of processes narrow, parallel and pruinose, the second jointed with the middle valve, penis curving to meet the second 
process. Wings hyaline, veins dark brown, second submarginal cell three times as long on the costa as the first, sections 
of the fourth vein proportioned 1 : 0.3 : 1 : 1.6, vein between the basal cells weak, discal cel] two and a half times as long 
as broad, anal vein indicated by a weak transparent fold, hairs of the hind margin shorter than the anterior crossvein, 
alular hairs short and not dense. 
Female. Pruinosity of the abdomen less evident, face above the epistome less deep than broad, 
Type and allotype, Mount Constitution, Washington, the male collected July 22, 1909, the female, May 17, 1910. 
Five paratypes collected by the author on the South slope of Mount Rainier, Washington, and another at the Canyon 
Camp, Yellowstone Park, Wyoming. 
(2) Philetus schizophorus, nov. sp. (PI. 8, Fig. 81.) — Difiering from the preceding species in the genitalia 
but otherwise similar. The uppermost pair of pygidial processes sliining, broadly quadrate at base and then deeply and 
widely excised so as to terminate in two long thin divaricating fingers, the second process arising from the dorsal by 
a narrow polished stem, penis very short and thin, not attaining the second process. 
Two specimens, Van Trump Creek, above Christine Falls, Mount Rainier, 1 September, 1917 (Melander). 
