216 DIPTERA 
Type species : B. bicolor, Loew (Pl. 8, Fig. 20), Coquillett's designation. This species. 
occurs along the Pacific coast from Alaska to the State of Washington. It may be that Bigot's Clinocera 
maculijes, a species with yellow antennes, halteres and legs, may belong here. ; 
Geographical distribution, 
1. B. bicolor, Loew, Berl. Ent. Zeitschr. Vol, 7, p. 18: Cent. 3, No. 34  W. North America. 
[1863] (Synamphotera); Coquillett, Proc. Wash. Acad. Sc. Vol. 2. 
p- 423 [1900] (Synamfhotera);; Melander, Trans. Amer. Ent. Soc. 
Vol. 28, p. 231 [1902] (Synamphotera) ; Coquillett, Proc. Ent. Soc. 
Wash. Vol. 5, p. 247 (1903). — PI. 8, Fig. 20. 
2. B. ? maculipes, Bigot. Bull. Soc. Zool. France, Vol. 12, p. 118 [1887] California. 
(Clinocera); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 245 
[1902] (Cliuocera); Engel, Deutsche Ent. Zeitschr. 1918, p. 35 [1918] 
(Clinocera). 
3. GeENUs SYNAMPHOTERA, LoEW 
Synamphotera, Loew, Zeitschr. Ges. Naturw. Vol. 11, p. 454 (1858); Syst. Beschr. Vol. 2, p. 255 
(1871); Roeder, Wien. Ent. Zeit. Vol, 6, p. 169 (1887); Bigot, Ann. Soc. Ent. France (6), Vol. 9, 
p. 120 (1889); Williston, Man. N. Amer. Dipt. p. 75 (1896); Melander, Williston Man. N. Amer. 
Dipt. p. 222 (1908); Lundbeck, Dipt. Dan. Vol.3, p.226 (1910). — T 
Dryodromia, Rondani, Dipt. Ital. Vol. r, p. 150[1856] (Dryodromya and Driodromyia); Mik, Ent. Nachr. 
Berlin, Vol. 12, p. 324 (1886); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 248 (1903); Kertész, 
Cat. Dipt. Vol. 6, p. 119 (1909); Engel, Deutsche Ent. Zeitschr. 1918, p. 3 (1918). 
Characters. — An entirely yellow, bristleless insect with short antenna and full neuration. 
Head globular, eyes moderately large, round, bare, facets uniform, no excision at the antenne, well 
separated ou the front and face in both sexes; cheeks linear, epistome long, face extremely short; 
proboscis shorter than the head, vertical, chitinous, tubular, the palpi long, projecting straight forward, 
cylindrical and hairy in the female, compressed in the male, in which sex they are conspicuous ; antennze 
located well down on the head, the basal two joints shorter than broad, the third joint short ovate, rather 
broad, and with a stumpy two-jointed terminal style which is tipped with a short bristle. Thorax 
moderately large, pollinose, without bristles, the scutellum with a few marginal setulz,, prothorax short. 
Abdomen nearly bare; epipygium reflexed and large, penis very thick, two pairs of erect side valves; 
ovipositor conical, erect. Legs rather slender, without bristles, spurs or setze, front coxa one-half as 
long as the femora and slightly longer than the posterior coxze, pulvilli moderate, empodium bristle-like, 
minute. Wings with narrowed base, axillary angle very blunt, costa continuing around the wing, no 
basal bristle, no costal setule, stigma very faint, auxiliary vein attaining the costa, first vein ending 
beyond the middle of the wing, third vein forked and normally the upper branch angulate and connected 
with the second vein by an extra crossvein, discal cell complete and long, posterior cells sessile, anal 
crossvein slightly reflexed and recurved, abruptly ending in the complete anal vein which meets the 
wing-margin, the anal cell a little shorter than the second basal, fourth vein arising near the base of the 
anal cell, a fold present beneath the humeral crossvein, marginal cilia and costal hairs very short. The 
crossveins at the end of the wing are quite unstable, additional ones may be present or the normal one 
absent. 
Taxonomy : In the analytical key to the genera of Empidina of his Prodromus of the Italian 
Diptera, Rondani established the genus Dryodromia, citing but not describing the species /es/acea. 
Coquillett was of the opinion that Rondani's species was Hilara tenella Fallen, with a supernumerary 
