FAM. EMPIDID/E 259 
Polydromia, Bigot, Ann. Soc. Ent. France (3), Vol. 557, 562 [1857] (Polydromya) ; Coquillett, Proc. 
Ent. Soc. Wash. Vol. 5, p. 256 (1903); Coquillett, Proc. U. S. Nat. Mus. Vol. 37, p. 593 [1910] 
(Polydromya). 
B. SuBcENUS CLADODROMIA, BEZZI 
Cladodromia, Bezzi, Ann. Mus. Hungar. Vol. 3, p. 453 (1905); Melander, Williston's Man. N. 
Amer. Dipt. p. 223 (1908); Bezzi, Nova Acta Akad. Naturf. Halle, Vol. 9r, p. 299 (1909). 
C. SuBcENUS METACHELA, CoQUILLETT 
Metachela, Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 253, 263 (1903); Melander, Williston's Man. 
N. Amer. Dipt. p. 223 (1908); Coquillett, Proc. U. S. Nat. Mus. Vol. 37, p. 568 (1910). 
Hemerodromia, s. str. Melander, Trans. Amer. Ent. Soc. Vol. 28. p. 233 (1902). 
D. SuBGENUS NEOPLASTA, CoquILLETT 
Neoplasta, Coquillett, Proc. U. S. Nat. Mus. Vol. 18, p. 389, 392 (1905); Williston, Trans. Ent. Soc. 
Lond. Vol. 3, p. 440 (1896); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 254, 261 (1903); 
Melander, Williston's Man. N. Amer. Dipt p.223 (1908); Bezzi, Nova Acta Akad. Naturf. Halle, 
Vol. 91, p. 299 (1999); Coquillett, Proc. U. S. Nat. Mus. Naturf. Halle, Vol. 37, p. 575 (1910). 
Characters. — Eyes rather large, the lower facets larger than the upper but not expanding the 
eyes so as to bring them almost together on the face, as in Hemerodromia, front relatively longer, the 
sides of the face parallel; style one-third to one-twentieth as long as the third antennal joint, bare. 
Thorax typically gradually narrowed anteriorly, but often the thorax is quadrate, the humeri marked 
off by distinct grooves, a flattened or depressed space before the scutellum, the scutellum narrower than 
the metanotum, with two apical setze placed close together. Front coxa thin, front femora usually 
strongly raptorial and setose in front and back. Costa continuing around entire wing-margin, auxiliary 
vein straight, well-separated from the costa, the humeral crossvein distinct, first vein ending at or beyond 
the middle of the wing, pedicel of the second and third veins distinct though rather short, anal cell 
complete, the anal vein separated from the hind margin. - 
(The subgenera of CAelifera are characterized as follows : 
Chelifera, Macquart, s. str. Discal cell complete, emitting two veins, the anterior of which is 
forked, thus the second posterior cell has a long petiole; second vein curving around a more or less 
visible stigma ; thorax distinctly tapering anteriorly in surface view ; no ovipositor; front femora strongly 
setose; antennalstyle very short and bare, one-tenth to one-fourth as long as the third joint of the 
antenng. 
Tyne species : C. frecatoria, Fallen (Pl. 4, Fig. 28). 
Cladodromia, Bezzi. ^ Discal cell complete, emitting three veins, the second posterior cell sessile 
or pointed at its base, rarely with a short petiole; thorax opaque, apparently quadrate; ovipositor rather 
thick and long ; front legs strongly setose; antennal style very short. 
Type species : C. znca, Bezzi. 
Metachela, Coquillett. Discal cell fused with the second basal, the anterior crossvein far before 
the posterior, second posterior cell with a long petiole; thorax not tapering in front; ovipositor ensiform; 
front femora setose; style one-third as long as the third antennal joint and thick; pygidium erect. 
