283 DIPTERA 
9. Front tibie of male marked with blacktip. . . . . . . « ; : . e 4 9 0 0 10d 
Front tibiz of male with two spots. (Il, Indiana)  . . . . . . T. Hamrti, Malloch. - 
10. Lighter portions of legs pale yellow, the black of male front tibiae 5 
abruptly filling the apical third. (Texas) . . . . . - . . T. pivEnRsrPES, Melander. 
Lighter portions of legs testaceous, the black of male front tibi * 
forming an oval spotoninnerside. (Ont., Virginia) . . . . . Tz: PHENGITES, nov. sp. (r1). 
1r. Front legs of male heavily pubescent; palpi black but overlaid with 
long silvery hairs; propleure polished; dark cross-bands of wings 
blackish; legs black; second vein strongly sinuous. (Ore.). . . . T. miRTIPES, nov. sp. (2). 
Legs not heavily pubescent; propleure pollinose . . MAU cm IUE INES. CH 
12. Second vein somewhat sinuous; palpi black. (Cal., Utah, Us. Wash., : nt 
idi) v ^ : . . T. Seuwagzi, Coquillett. 
Second vein straight up to its oci] curve; "Ris iin (Wash. ) - «. T. CHELANA, nov. sp. (3). 
13. Wings with a single large cloud in anterior apical portion; crossveins 
approximated; notum shining. . . 4 . . 5 . 4. 4 9 9 «wx aT. MM 
(1) Tachydromia phengites, nov. sp. — Male. Length 1.5 mm, Similar to Sehwarzii, Coquillett, but the 
middle hyaline band of the wings forming a straight streak across the wings instead of being curved or angulate at 
the fourth vein. Mesonotum lightly scabrous, subshining, abdomen polished black. Antennae brown, the outer joint short 
oval, with terminal arista — Palpi blackish, slender, in both sexes, with a terminal black bristle; proboscis short, blackish. 
A large white pruinose spot above the front coxze. Knobs of the halteres white. Legs brownish yellow, the hind femora 
and tibiz, except basally, black, front coxze and upper side of front femora dark, last tarsal joint black, front tibia: of male 
tipped within with a round black spot. Wings marked with two broad brown crossbands, leaving the base, middle and 
tip hyaline; the second section of the costa two and one-half times the third section which is three times as long as the 
fourth section, second vein very gently curved and not arched, posterior crossvein shorter than the anterior, the distance 
between them twice the length of the posterior crossvein, In Selhwarzii it is more than twice. Letting I 
ending in the middle of the hyaline band. 
Five specimens, Falls Church, Virginia, received from Nathan Banks, and Ridgeway, Ontario, received ien 
M.C Van Duzee. The species is a close relative of T. Hartí, which has two black spots on the front side of the front 
tibiz of the male. 
(2; Tachydromia hirtipes, nov. sp. — Male. Length 3 mm. Shining black, the abdomen dull. Occiput and 
front pollinose, only the chin polished; antennae piceous, the outher joint oval with the arista almost terminal and six times 
length of the joint; palpi narrow, black, nearly as long as the proboscis, overlaid with long silvery hairs and tipped with a 
black seta. Thorax smooth, jet-black, only the pectus and a spot above hind coxe pruinose, Abdomen piceous, the 
genitalia black, asymmetrical, consisting of three narrow, curving valves, last ventral fringed with black bairs. Legs 
black, the front coxze, the knees and the hind metatarsi piceous, front femora very robust, marked with a transluscent spot 
near middle of inner side, front legs covered with abundant brown fine hairs, middle femora with a small brush of setze at 
base beneath, middle tibim with a shallow emargination just before tip on flexor side. Knob of halteres white. Wings 
with arched costa, the base, middle and apex narrowly hyaline, the intermediate areas forming two broad deeply fuliginous 
cross-bands, second vein sinuous, the marginal cell narrowest at the hyaline middle band, second section of costa more than 
two times third, anterior crossvein at two-thirds length of discal cell, sections of fifth vein 2 : 1, the last section forming 
a sharp boundary to the proximal dark band, the middle hyaline band therefore angulate at the fourth vein. 
Female, first four segments of abdomen subshining; legs not conspicuously pubescent, the front femora lacking 
the transluscent spot and the middle legs lacking the basal brush and apical emargination. 
Eight males and five females, all collected on rocks in the mountain stream near Viento, Oregon, July 1, 1917, and 
Aug. I, 1921. 
(3| Tachydromia chelana, nov. sp. — Female. Length 2.5 mm. Polished black, the upper occiput lightly 
pruinose, pruinosity of pectus reaching back to forward portion of the propleura.  Antennz piceous. arista subterminal 
and five times length of last antennal joint; palpi two-thirds length of proboscis, ribbon-like, white, the hairs microscopic, 
no apical seta. Mesonotum smoothly polished; two pairs of scutellar bristles, Coxze and metatarsi yellowish, remainder 
of legs blackish, the hind pair darkest, Halteres with white knob and blackish root. Wings narrow, bifasciate with 
blackish, leaving the base, middle and apex hyaline, the outer dark band encroaching proximally in the first posterior cell, 
first and second veins ending at outer edges of respective dark bands, the second vein straight through its course up to its 
apical gentle curvature, distance between crossveins three and one-half times the length of posterior crossvein, last section 
of fifth vein two-thirds tbe preceding, ending at beginning of outer dark band, 
Two specimens, Stehekin, at the head of Lake Chelan, Washington, July 3o, 1919 (Melander). 
