FAM. EMPIDID/E CST 
usually four scutellars, six to eleven uniseriate dorsocentrals, the foremost large and placed toward the 
humeri, acrostichals irregularly biseriate; pectus with a few microscopic hairs, metapleurz with a vertical 
row of five setule. Abdomen slender, twice as long as the thorax, setulose, the lateral pairs of pits 
oblique, the sixth, seventh and eight segments of the male shallow to accomodate the large reflexed 
epipygium, from the anterior base of the epipygium two strong dorsal prongs extend forward, middle 
valves large, convex, ovate, terminal valves small and hastate, penis thick, curving forward; eighth 
segment of the female entirely retracted within the full-sized and compressed seventh segment. Legs 
long and slender, specialized in the male by bristles and a lengthening of the tarsus, front coxa half as 
long as the femora and one-third longer than the posterior pairs. Wings almost cuneiform, the anal 
lobe slightly evident, costa continuing around the entire wing, with a long basal bristle and small 
setule, auxiliary vein straight, vanishing apically opposite the anterior crossvein, first vein extending 
two-thirds the wing-length, third vein with a long fork, the main branch ending at the tip of the wing, 
discal cell located before the middle of the wing, scarcely longer than the second basal, the anterior 
crossvein near the middle of the discal cell, the first basal cell therefore much longer than the second, 
pedicel of the second and third veins arising near the humeral crossvein, pedicel of the fourth vein arising 
directly under the humeral crossvein and close to the base of the second basal, anal cell narrow, its 
crossvein strongly recurved, extending back one-fourth the length of the anal cell before fusing with the 
anal vein, which is weak, gradually evanescent and does not reach the hind margin, no alula, hairs of 
the hind margin of the wing very small; calypteres moderate, their hairs fine and silky. 
Type species : P. anfpleclens, nov. sp. (Pl. 7, Fig. 65). The genus is apparently a close 
relative of Dijsomyia, and with it shows many resemblances to the Empidina. The neuration is quite 
constant among the following species. 
Geographical distribution. 
1. P. amplectens, nov. sp. — Pl. 7, Fig. 66. California. 
2. P. exporrecta, nov. sp. Montana. 
3. P. fistulator, nov. sp. — PI. 8, Fig. 75. Quebec. 
4. P. monogramma, nov. sp. W. United States. 
var. flavicoxa, nov. var. ; Idaho, Washington. 
5. P. solivaga, nov. sp. Washington. 
KEY TO THE MALES OF PROCLINOPYGA 
1. Under side of middle femora bearing three pale setze at base, 
middle tibize swollen near middle and there bearing many 
flexor setulze, middle metatarsus as long as tibia; sixth abdo- 
minalsegment with many long black bristles, sides ofabdomen 
witbishortpale ael er i pte ur 1 P. AMPLECTENS, D0Vs Sp« (E 
(1) Proclinopyga amplectens, nov. sp. (PI. 7, Fig. 65). — Male. Length 4 mm.  Olivaceous above, 
cinereous, almost! white pruinose, on the sides and beneath, face whitish, mouthparts black ; first joint of the antennze short- 
cylindrical, with a few setulze above, second joint with a crown of setule, third joint pubescent, twice as long as wide; 
hairs of lower occiput sparse and white. Ten dorsocentrals, about nine irregular pairs of acrostichals not extending on 
prescutellar area, no scutellar setulze, pronotum with a pale hair on each side, metapleural hairs white. Lateral and ventral 
hairs of the abdomen short and white, dorsal setule black; sixth tergite with a cluster of black hairs, epipygium black. 
Legs entirely black, coxal hairs white, front femora equal to their tibiz, the front tarsi one-half longer, middle tibiae 
somewhat longer than their femora, closely setulose from middle to apical fourth, broadly excised within toward tip, middle 
tarsi greatly lengthened, nearly twice as long as their femora, the metatarsus nearly as long as the remainder, hind legs 
simple the femora with a few black extensor setulz, posterior femora with along white bristle beneath near the base, all 
the pulvilli of microscopic size, empodium similarly small, compressed. Wings three times as long as broad, widest beyond 
