FAM. 'EMPIDID/E 293 
antennal emargination small, facets nearly uniform, bare; sides of front diverging, separated at the 
antenne as much as the length of the outer antennal joint, face short, a little narrower than the front, 
epistome shining ; antennz two-jointed, the outer joint oval, with long coarse terminal arista; proboscis 
incurved, palpi small, oval, bisetose. "Thorax quadrate, notum coarsely hairy, one humeral, one 
posterior dorsocentral, apical scutellars crossed, pleure completely pruinose; abdomen subshining, 
terminal styles of female small. Legs hairy but devoid of distinct bristles, the front femora enlarged. 
Costa continuing to fourth vein, first section hairy, basal seta present, first vein ending at middle of 
wing, second vein ending midway between first and third, basal cells rather small, first somewhat 
surpassing the second, posterior crossvein oblique, the lower-outer angle of the second basal cell about 
seventy degrees, a vague trace of the reflexed anal crossvein visible. 
Genotype : C. microphona, nov. sp. 
'This genus in venation and general appearance suggests Chersodromia, but the legs lack the 
characteristic bristles of that group. The specialized humeri suggest Tachyempis, but the approximation 
of the crossveins preclude kinship to Tachyempis and its nearrelatives. t is regrettable that the male 
has not been discovered. Two species are here recorded. 
Geographical distribution. 
£6 microphona, nov. sp. (1). ; Washington. 
2. C. syletor, nov. sp. (2). Washington. 
7T. GENUS COLOBONEURA, MELANDER 
Coloboneura, Melander, Trans. Amer. Ent. Soc. Vol. 28, P. 299 (1902); Coquillett, Proc. Ent. Soc. 
Wash. Vol. 5, p. 248, 261 (1903); Bezzi, Ann. Mus. Hungar. Vol. 2, 321 (1904); Melander, 
Williston's Man. N. Amer. Dipt. p. 223 (1908); Kertész, Cat. Dipt. Vol. 6, p. 143 (1909); 
Coquillett, Proc. U. S. Nat. Mus. Vol. 37, p. 526 (1910); Melander, Psyche, Vol. 17, p. 49 (1910). 
Characters. — Thick-set, bristly, opaque pollinose species of three to five millimeters. Head 
globular, higher than broad, broader than deep, densely pollinose, the occiput large below and setose, 
two pairs of vertical, one pair of diverging ocellar and one of cruciate preocellar bristles. | Eyes small, 
in both sexes widely separated on the face and less so on the front, face convex, cheeks one-third the 
eye-height with nearly straight lower margin, clypeus pollinose, semicircular; eyes with very short 
microscopic pubescence, the facets uniform, hind margin broadly excised below and lower angle round. 
Antennz contiguous, plainly three-jointed, the second joint with a crown of setulz, the third joint short 
(1) Charadrodromia microphona, nov. sp. — Female. Length 1.25 mm, Piceous black, head and thorax 
entirely overlaid with fine cinereous pollen, bristles and hairs brown; abdominal hairs sparse. Antenne brown, arista 
twice the length of the outer antennal joint; palpi yellow, proboscis black. Legs yellowish, the posterior coxze and the 
femora more or less tinged with light brownish, apex of tarsi somewhat dusky, a small preapical seta on hind tibize. 
Wings hyaline, veins yellow, fourth vein ending at wing-tip, first posterior cell widest at margin, sections of fifth vein 
proportioned 2 : 3. 
Seven specimens, Bickleton, Washington, 26 June, 1917 (Melander). 
(2) Charadrodromia syletor, sp. nov. — Female. Length2 mm. jet black in ground-color, the head overlaid 
with dust, brownish above and cinereous below, mesonotum lightly: brown-dusted, pleurz completely gray-pruinose. 
Antennz black, arista twice the length of the antenna, palpi blackish. ^ Notal hairs shorter than in the preceding species ; 
abdomen shining black, terminal styles slender and black. Legs black, hairs yellowish, front tibiz thicker than posterior 
pairs. Wings brownish, veins brown, first posterior cell widest at middle, crossveins meeting, sections of fifth vein 
2:50: 
Holotype, Adna, Washington, 1o July, 1917 (Melander). 
