FAM. EMPIDIDZE 2I 
rufitarsis, Zetterstedt; Dipt. Scand. Vol. 8, p. 2994 (1849); Lundbeck, Dipt. 
Dan. Vol. 3, p. 18 (1910); Wahlgren, Ent. Tidskr. Vol. 31, p. 46 (1910). 
vitripennis, Meigen, Syst. Beschr. Vol. 2, p. 348 (1820); Macquart, Dipt. 
, N. France, Vol. 3, p. 149 (1827) ; Hist. Nat. Dipt. Vol. rz, p. 319 (1834); 
- Curtis, Brit. Ent. Vol. 8, p. 661 (1837); Zetterstedt, Fauna Ins. Lappon, 
p. 535 (1838); Dipt. Scand. Vol. 1, p. 234 (1842); Boitard, Man, Ent. 
Vol. 3, p. 316 (1843); Zetterstedt, Dipt. Scand. Vol. 8, p. 2994 (1849) ; 
Walker, List. Dipt. Brit. Mus. Vol. 3, p. 485 (1849); Dahlbom, Svenska 
Vet. Akad. Handl. p 160 (1851); Scholz, Zeitsch. Ent. Breslau, 
Vol. 5 (17), p. 48 (1851); Walker, Ins. Brit. Dipt. Vol. r, p. 121 (1851); 
Zetterstedt, Dipt. Scand. Vol. 11, p. 4267 (1852) ; Vol. 13, p. 4978 (1859). 
I0. H. discoidalis, Meijere, Tijdsch. v. Ent. Vol. 56, Suppl. p. 66 (1914). Java. 
II. H. ectorus, nov. sp. (1). Costa Rica. 
12. H. * exilis, Meunier, Ann. Sc. Nat. (Zool.) Vol. 7, p. 9r, 109, pl. 7, Baltic Amber. 
f. 8, 9 (1908). 
13. H. femoratus, Mueller, Zool. Dan. Prodr. p. 181 [1776] (AsZlus); Walker, Europe, Egypt. 
Ins. Brit. Dipt. Vol. r, p. 121 (1851); Schiner, Fauna Dipt. Austr. 
Vol. z, p. 78 (1862); Giard, Traité Ent. Vol. 3, p. 992, pl. 108, f. 6 
(1885); Strobl, Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p. 44 
(1892); Becker, Mitteil. Mus. Naturk. Berlin, Vol. 2, p. 47 (1902) ; 
Czizek, Zeitschr. Máhr. Landesmus. Brünn, Vol. 7, p. 165 (1907); 
Lundbeck, Dipt. Dan. Vol. 3, p. 13 (1910); Walhgren, Ent. Tid- 
schrift, Vol. 31, p. 46 (1910); Carter, Ent, Mag. Vol. 48, p. 59 
(1912); Frey, Acta Soc. Sc. Fenn. Vol. 37 (3), p. 7 (1913). 
flavipes, Meigen, Klassif. Beschr. Eur. Zweifl. Ins. Vol. r, p. 241 (1804); 
Fabricius, Syst. Antl. p. 145 (1805); Fallen, Empid. Suec. p. 5 (1815); 
Meigen, Syst. Beschr. Vol. 2, p. 348, pl. 21, f 2o (1820); Macquart, 
Mém. Soc. Sc. Lille, p. 145 (1823); Dipt. N. France, Vol. 3, p. 149 (1827); 
Hist. Nat. Dipt. Vol. 1, p. 319, pl. 7, f. 13 (1834) ; Zetterstedt, Fauna Ins 
Lappon. p. 535 (1834) ; Curtis, Brit. Ent. Vol. 8, p. 661 (1837) ; Zetterstedt, 
Dipt. Scand. Vol. rz, p. 235(1842); Boitard, Man. Ent. Vol. 3, p. 316 (1843); 
Gimmerthal, Bull. Soc. Natur. Moscou, Vol. 20 (2), p. 163 (1847); Walker, 
List Dipt. Brit. Mus. Vol. 3, p. 485 (1849); Zetterstedt, Dipt. Scan. 
Vol. 13, p. 4978 (1859); Pipping, Not. Sállsk, Fenn. Fórh. Vol. 4, p. 114, 
(1858); Bonsdorff, Finl, Tváv. Ins. Dipt. p. 142(1861); Siebke, Nyt Mag. 
Naturvid. Vol. 14, p. 380, 384, 399 (1866). 
var. fumipennis, Meigen, Syst. Beschr. Vol. 2, p. 349 (1820); Ahrens & Germar, Europe. 
Fauna, Ins. Eur. Pt. 12, p. 25(1829); Curtis, Brit, Ent. Vol. 8, p. 661 
(1837); Walker, List Dipt. Brit. Mus. Vol. 3, p. 486 (1849); Scholz, 
Zeitschr. Ent. Breslau, Vol. 5 (17) p. 48 (1851); Walker, Ins. Brit. Dipt. 
Vol. 1, p. 121 (1851); Pipping, Not. Sàállsk. Fenn. Fórh. Vol. 4, p. 114 
(1858); Bonsdorff, Finl. tvàv. Ins. Dipt. p. 142 (1861); Schiner, Fauna 
Austr. Dipt. Vol. z, p. 78 (1862); Neuhaus, Dipt. March. p. 68 (1886); 
Strobl, Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p.'44 (1892); 
Czizek, Zeitschr. Máhr. Landesmus, Brünn, Vol. 7, p. 165 (1907); 
Wahlgren, Ent. Tidskr. Vol. 3r, p. 46 (1910); Kuntze, Deutsche Ent. 
Zeitschr. p. 548 (1913). 
(1) Hybos ectorus, nov. sp. — Male. Length4 mm. Third antennal joint ovate, one and three-fourths times 
long as wide, arista three times antennal length ; upper facets enlarged. "Thorax moderately dusted with brown, leaving a 
pair of short vittae and a rounded side spot shining, one pair of dorsocentrals large, apical scutellars long, pleurz cine- 
reous. Abdomen dusted with brown, leaving the hind margin of the last three segments shining; hairs sparse and yellow ; 
pygidium not fimbriate, the upper valve deeply cleft, apically ending in two triangular processes of which the right one is 
smaller and narrower, lower valve with spoon-like termination, intermediate valve, on right side, large and bearing a flat- 
tened claw which fits into the cleft of the upper valve. Legs black, anterior coxce and base of hind coxz cinereous, front 
metatarsi slender, four-fifths as long as tibize, middle tibiz with a long seta at middle of flexor face, at basal fifth and two- 
fifths of extensor face, hind femora rather slender, hairs black becoming longer and yellow below, a dorsal bristle before 
knee, six spinous bristles in lower anterior row, ventral denticles arising from minute tubercles, geniculation of hind tibie 
brown, nothorns on metatarsal sole. Knob of halteres brown, wings gray-hyaline, stigma weak, sections of fifth vein 2 : 1. 
Female. Dust forming broad triangles on abdominal segments. 
Eight males, eleven females, La Suiza de Turrialba, Costa Rica, Pablo Schild, collector. 
