FAM. EMPIDIDZE 251 
HEMERODROMI!A, MEIGEN, SENSU LATIORE 
Hemerodromia, Meigen, Syst. Beschr. Vol. 3, p. 61 (1822); Macquart, Dipt. N. France, Vol. 3, 
p. ror (1827); Hist. Nat. Dipt. Vol. r, p. 347 (1834); Zetterstedt, Fauna Ins. Lappon. p. 542 
(1838); Dipt. Scand. Vol. 1r, p. 260 (1842); Boitard, Man. Ent. Vol. 3, p. 322 (1843); Walker, 
Ins. Brit. Dipt. Vol. r, p. 142(1851); Rondani, Dipt. Ital. Vol. r, p. 148 (1856); Bigot, Ann. 
Soc. Ent. France (3), Vol. 5, p. 562 (1857); Schiner, Fauna Dipt. Austr. Vol. 1, p. 82 (1862); 
Loew, Wien. Ent. Monatschr. Vol. 8, p. 237-255 (1864); Lioy, Atti Instit. Ven. 1864, p. 719 
(1864); Róder, Wien. Ent. Zeit. Vol. 6, p. 169 (1887); Bigot, Ann. Soc. Ent. France (6), Vol. 9, 
p. 123 (1889); Coquillett, Proc. U. S. Nat. Mus. Vol. 18, p. 389, 391 (1895); Williston, Trans. 
Ent. Soc. London, Vol. 3, p. 440 (1896); Man. N. Amer. Dipt. p. 75 (1896); Melander, Trans. 
Amer. Ent. Soc. Vol. 28, p. 233 (1902); Bezzi, Ann. Mus. Hungar. Vol. 3, p. 452 (1905); 
Melander, Williston's Man. N. Amer. Dipt. p. 223 (1908); Bezzi, Nova Acta Akad. Naturf. Halle, 
Vol. 9t, p. 123 (1889); Kertész, Cat. Dipt. Vol. 6, p. 112 (1909); Lundbeck, Dipt. Dan. Vol. 3, 
p. 228 (1910); Wahlgren, Ent. Tidskr. Vol. 31, p. 44, 83 (1910). 
Characters. — Slender, elongate, frail, nearly bare, little flies with elongate raptorial front legs 
and forked third vein, usually of reddish coloration, but sometimes the body is blackened. Head 
produced obliquely downward, somewhat flattened, nearly as broad as the thorax, ocelli placed rather 
far forward, eyes obliquely oval, bare, with a rather deep notch at the antenne, facets more or less 
enlarged below, lower orbits usually with a conspicuous white pruinose spot, which is broader below, 
vertex large and broad, front varying from short to long, but broader than the short face, which is 
sometimes quite narrowed by the subcontiguous eyes, cheeks linear, oral opening and epistome with 
dense silky pubescence, vertex rarely with setule and with no or one bristle. Antenne inserted low 
on the head, contiguous, three-jointed, the basal joints not setose, the third joint compressed ovate, 
with apical unjointed style which varies from one-twentieth to two-thirds the length of the third joint 
and is either bare or hairy. Proboscis about as long as the head, slender, incurved, the densely hairy, 
small, slender, one-jointed palpi more or less retracted, vertical or directed somewhat backward. Thorax 
conspicuously longer than wide, quadrate or tapering forward when viewed from above when the 
prothorax and metathorax are quite visible, humeral grooves more or less distinct, pollinose but not 
pubescent, with very sparse biseriate acrostichal and uniseriate dorsocentral setule, no prescutellar 
bristles, no humeral, one supraalar, one or no postalar bristles, several notopleural setulz,, sometimes 
two fine scutellar bristles, sometimes no, two or four scutellar hairs, setulz in front of the scutellum 
proclinate; mesopleurz very long between the front and middle coxal attachments, metapleure bare. 
Abdomen slender and cylindrical, comprising eight segments, the first very small and in the male the 
last also, ovipositor more or less conical, variable in length, pygidium globose or with a hood-shaped 
lower piece surmounted by a pair each of broad, usually forcipate lateral and dorsal valves, penis clavate 
or capitate, sometimes hidden. Legs slender, the posterior pairs simple but the front pair remarkably 
modified, front coxe very long, usually extremely slender, the prosternum flared at the coxal cavities, 
front femora and front tibiz raptorial, the former swollen and with biseriate flexor setule and usually 
with prominent lateral stiff setze, the front tibiz shorter than the femora, produced within as a sharp 
spur and with flexor setulee which engage between the femoral setulz when the leg is folded, otherwise 
no bristles or apical spines, tarsi simple and slender, the posterior metatarsi long, pulvilli minute. 
Wings slender, oval, the anal angle wanting, costa continuing around the entire wing, but in Hemerodro- 
mia s. str. very much attenuated beyond the fourth vein, no costal bristle or setulz, the costal hairs short, 
but the hairs of the hind margin rather long, especially toward the base, auxiliary vein present but its 
