FAM. EMPIDID/E 217 
crossvein. Although such aberrant specimens may be rare in the genus Hilava, so as to make it doubtful 
if Coquillett's conclusion is correct, yet his supposition is plausible enough to warrant the retention of 
the better-known name Synamphotera for this genus. Anyway, Rondani's species feslacea was tabulated 
sine descriptione and would give way to Loew's well described ?a/lida. | Mik referred Dryodromiato Tachyfeza 
in the reference above given. 
Tyne species : S. ?alliia, is the only known form. | It occurs in Europe and is considered rare. 
Its earlier stages are not known. 
Geographical distribution. 
I. S. fallida, Loew, Zeitschr. Ges. Naturw. Vol. 11, p. 455 (1858); Syst. C. & S. Europe. 
Beschr. Vol. 2, p. 253 (1871); Lundbeck, Dipt. Danica, Vol. 3, 
p. 227, f. 95-97 (1910); Collin, Ent. Mag. London, Vol. 24 (2), 
p. ro6 (1913), — PI. S, Fig. 23. 
testacea, Rondani, Dipt. Ital. Vol. 1, p. 150 [1856] (Dryodromia), table name; 
Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 248 (1903), as syn. of Hilara 
tenella, Fall. 
4. GENUS NIPHOGENIA, NOV. GEN. 
Characters. — Slender insects with lengthened antennz. Head globose, eyes round, bare, 
facets uniform, face wide and convex, particularly so in the female, continuous with the small cheeks, 
its lower edge straight; front broad, half as long as the face, setulose above antenne, ocellar triangle 
scarcely elevated, ocellar bristles reaching two-thirds the way to the antenne, no vertical bristles but the 
uppermost occipital setze bristle-like; first antennal joint more than twice as wide as the globose second, 
both joints loosely setulose, third joint as long as the head, slightly tapering. loosely pubescent, tipped 
by a microscopic setula; proboscis short and thick, palpi pendent. Thorax with full rows of uniseriate 
uniform dorsocentrals and acrostichals, several humeral bristles, and one each of intrahumeral, posthum- 
eral, notopleural, supra-alar, intra-alar and postalar bristles, two scutellars, metapleurze bearing a cluster 
of setule; prescutellar area not depressed. Abdomen cylindrical, seven segments before the pygidium, 
loosely setose, showing small pittings arranged across base of second segment and in pairs on sides of 
.the segments; pygidium globular, not widening the abdomen, dorsal valves erect, terminal valves 
abruptly bent vertically down and flat, terminal processes long, slender, pointed and decussate, penis 
erect. Legs slender, not bristly, coxe loosely setose, tarsi longer than their tibie, pulvilli small, 
empodium microscopic but fleshy. "Wings normal, anal angle not projecting, costa encompassing entire 
wing, costal bristle present, auxiliary vein evanescent before the anterior crossvein, second vein long, 
third vein forked, discal cell complete, emitting three veins, anterior crossvein at two-fifths the length 
of the discal cell, the first basal cell therefore much longer than the second, anal crossvein arising 
rectangularly and uniformly curving into the lower side of the anal cell, no anal vein, fold in wing- 
membrane at root of second basal cell visible but not pronounced ; calypteres with nearly straight edge 
and weak fringe. , 
Genotype : N. eucera, nov. sp. 
Geographical distribution. 
I. N. eucera, nov. sp. (1). — PI. 8, Fig. 21. Washington. 
(1) Niphogenia eucera, nov. sp. (Pl. 3, Fig. 21). — Length 3mm.  Piceous black, covered with brown-gray 
but not heavy pollen. Antenne entirely black, the pubescence of the third joint brown. — About ten bristles in dorsocentral 
row and eight acrostichals. Eighth segment of female abdomen edged with numerous setze, eighth sternite of male with long 
