248 DIPTERA 
15. GENUS LAMPOSOMA, BECKER 
Lamposoma, Becker, Berl. Ent. Zeitschr. Vol. 33, p. 338 (1889); Coquillett, Proc. Ent. Soc. Wash. 
Vol. 5, p. 251, 263 (1903); Kertész, Cat. Dipt. Vol. 6, p. 120 (1909); Engel, Deutsche Bet 
Zeitschr. 1918, p. 3 (1918). 
Characters. — A minute insect, measuring one millimeter, shining blackin color and resembling 
Clinocera in form and venation, but differing in lacking a pollinose coating and in having broader wings. 
Head rounded, eyes large, finely pubescent, cheeks narrow, divided, face narrowed beneath, white 
pollinose and bare, the occiput shining black; third joint of the antenna oval, with a long apical arista; 
proboscis very short. "Thorax polished, a faint pollinose median vitta present, five strong dorsocentral 
bristles, two scutellars, no acrostichals ; pleurz and abdomen shining, bare except for a few hairs on the 
terminal segments; epipygium small, reflexed, with the lower piece hood-shaped. Legs slender, without 
bristles, the femora somewhat pale-ciliate beneath, the tibiz slightly enlarged apically, no pulvilli, empo- 
dium very small. Wings clear hyaline, broad and bluntly rounded, the veins slender, no stigma, costal 
bristle large, first vein ending before the middle of the wing, fork of the third vein greatly bowed, the 
second submarginal cell broad, discal cell rather blunt, emitting three posterior veins, anal cell 
extending as far as the second basal, no trace of the anal vein. 
But a single species is known, L. cavaticum, which was found in a cave in Dalmatia. 
Geographical distribution. 
1. L. cavaticum, Becker, Berl. Ent. Zeitschr. Vol. 33, p. 339, f. 3 (1889); S. Europe. 
Bezzi, Arch. Zool. Exper. Paris (5), Vol. 8. p. 5o (1911). — (PI. 7, 
Fig. 64). 
SuBFAMILY HEMERODROMIINZE 
Characters. — Very slender delicate species with raptorial front legs; usually of light coloration 
and with pale yellow appendages. Head globular, mouth-opening placed far back. proboscis inflexed, 
always shorter than the head and stout at the base, palpi small; eyes large, nearly or quite contiguous on 
the face in both sexes, but separated above the antennz, broadly emarginate on the lower occiput, 
lower facets largest when the eyes encroach on the face; antennz short, three-jointed, with a short style 
(Hemerodromia) or hairy two-jointed arista (Chelipoda), inserted below the middle of the head. Thorax 
narrow and diagonally elongate, scarcely arched, mesosternum much longer than the prosternum, front 
legs greatly distant from the posterior pairs and located close to the head, mesonotum nearly bare 
(Hemerodromia) or with bristles (Chelifoda), metapleurz hairy in the latter group, otherwise bare, 
prescutellar depression less evident than in the Climoceratine, — Abdomen slender, sometimes the last 
segments of the female drawn out to form an ovipositor 1 genitalia of the male either a terminal pygidium 
or reflexed epipygium. Legs long, the posterior pairs very slender, the front pair strongly raptorial, 
front coxz at least twice as long as the others, front femora thickened and armed below. Wings 
cuneiform, the anal angle not developed, costa continuing around the wing, except in Hemerodromia, 
s. str., where it is attenuated beyond the fourth vein, third vein forked (Hemerodromia) or not (Chelifoda), 
discal and anal cells present or absent, petiole of the second and third veins short, arising nearer the 
anterior than the humeral crossvein, anal crossvein if present perpendicular to the axis of the wing, 
stigma absent or present. Calypteres with straight edge and small fringe, and closely united to the 
base of the wing. 
