FAM. EMPIDID/E 105 
bristles fine, female with several reduced fronto-orbitals. Thorax usually with many hairs and bristles 
more or less definitely arranged, several humeral, posthumeral, notopleural and supra-alar bristles, 
acrostichals and anterior dorsocentrals short but numerous, scutellum with a fringe of marginal bristles; 
pleure bare of hairs, pollinose. Abdomen slender, twice as long as the thorax, pygidium small, with a 
pair of erect dorsal valves, penis short, more or less arcuate, female abdomen tapering. ^ Legs slender, 
simple, posterior femora of the male more or less ciliate with fine bristles. Wings large, hind angle 
rectangular, costa vanishing on the hind margin, no basal bristle, marginal hairs microscopic, auxiliary 
vein complete, distinct from the first, stigma usually present, third vein not forked, basal cells three- 
fourths as long as the large but blunt discal cell, second posterior.cell sessile, much narrower than the 
third, anal crossvein abruptly reflexed and continuous with the under side of the anal cell, anal vein 
more or less indicated, no alula, alular hairs short; calypteres margined with fine hairs. 
Type species : A. ribesii, Becker, selected by Coquillett in 1903. The species of this genus are 
all vernal and show a partiality to the flowers of Ribes. There is a possibility that Mzcrophorus drafetoides 
Walker belongs to this genus. 
KEY TO THE NORTH AMERICAN SPECIES OF ANTHEPISCOPUS 
I. Bristles of the body yellow; proboscis shorter than the head; knobs 
of the halteres black; femora and tibize yellowish ; sections of the 
fifth vein c proportioned 4 : ANS AU Por DS ORUM - . «* A, FLAVIPILOSUS, Coquillett. 
. Bristles black; proboscis longer du the head; last section of the 
Buren notjess tban one-thizd-thepreceding |. 5055s ox o o ome cut Ae 
2. Entirely black including the legs, halteres and calypteres, c 9 
At least the knees yellowish, Q; stem of the halteres and calypteres 
paler, Q;stylé distinct . . . . . EUER Me nili WM ca M TEE 
3. Sections of the fifth vein 3: 2; style distinct; penis trumpet- TORTER 
ten scutellar bristles; femora ciliate. — Pl. 8, Fig. 8O . . . A.srENTOR, Melander. 
Sections of the fifth vein 2 : 1; style minute; penis flexed but not 
enlarged at theend . . à à VXxvincduh dune s M RU 
4. The two prongs of the dorsal valve of ihe Socvitum FUHR lateral 
bristles of the thorax sparse; scutellum with about ten bristles; 
flexor cilia of the hind femora inconspicuous; last joint of 
antenne Q three times as long as broad; palpi Q rounded at the 
SHU eccueriWenN Uam e c Ui xo s uices As POLYGYNUS; DOV.- Sp.-(I). 
(1) Anthepiscopus polygynus, nov. sp. — Male. Length 3 mm. Entirely black including the legs, halteres 
and calypteres. Head subopaque, black, upper facets moderately large ; third joint of the antenne but little tapering, four 
times as long as broad, the style very short, its basal joint square and one-fifth as wide as the antenna; proboscis projecting 
as far as the head-height, palpi one-half as long as the proboscis and furnished with a few long hairs; occipital hairs 
abundant. Mesonotum opaque black. but when viewed from in front brownish gray, its bristles long but sparse, two 
posthumerals, four notopleurals, acrostichals biseriate, eight to ten scutellar bristles. Abdomen nearly opaque, with long 
black hairs, pygidium rather small, the furcation of the dorsal valve distinct, the posterior branch nearly as long as the 
anterior, penis shaped like an interrogation-mark (?. ^ Wings with uniform light infumation, stigma distinct, veins 
blackish, sections of the fourth vein proportioned 0.7 : 0.5 : 1 : 1.5, of the fifth vein 2 : 1, anal vein faint but almost reaching 
the margin. 
Female. Facets uniform; third joint of the antenna» broader, less than four times as long as wide, the style 
smaller; palpal hairs short; front shining. with two small fronto orbitals. Thorax and abdomen subshining, bristles 
shorter, sections of the fourth vein proportioned 0.5 : 0.4: 1 : 1.3. 
One male and seven females; Deer Park, Washington, May 5, 1912 (Melander). 
