20 DIPTERA 
7. Dorsocentrals strong and black; sete of middletibie verylong . . . . . . . . . . . & 
Dorsocentrals weak and pale; sete of middle tibize short, none 
on flexor side (H. reversus Walker) . . . . . M uv dg EL EL 
8. Anterior femora, hind knees, middle tibize and NESSETRNL tarsi 
luto 4 0 ok o. ror o 0 is s TUM MEDI 
Femora black, tibiz and tarsi yellowish; wings subhyaline . ^H. narTERALIS, Bezzi. 
9. Wings brown; ten spines in anterior row under hind femora. | H. sctAPTERUS, nov. sp. 
Wings hyaline; seven or eight spines in anterior row under 
hind femora. . . AGIS NNE EU UN s 3 . H. coNiATUS, nov. sp. 
ro. Wings of male buwaish gray on apical boda - . . H. nEVERSUS, Walker, s. str. 
Wings of both sexes grayish hyaline except for the stigma. .. var. sLossoN.e, Coquillett.' 
1r. Legs black, only thetarsi yellow. . . . . . . . . . H. wEtzLIPEs, Wheeler & Melander. 
Knees and base of hind tibi yellowish. . . . . . . . H.wkorRoPicus, Bezzi. 
Geographica! distribution, 
t. H. aficis, Brunetti, Rec. Indian Mus. Vol. 9, p. 12 (1913); Fauna Brit. Burma. 
Ind. Dipt. Vol. 1, p. 340, f. 26. 27 (1920). 
2. H. aurifes, Brunetti, Rec. Indian Mus. Vol. 9, p. 14 (1913); Fauna Brit. India. 
Ind. Dipt. Vol. 1, p. 341 (1920). 
3. H. Beszii, Kertész, Termes. Fuezet. Vol. 22, p. 175 (1899); Bezzi, Ann. New Guinea. 
Mus. Hungar, Vol. 2, p. 328 (1904). 
4. H. bisetosus, Bezzi, ibidem, Vol. 2, p. 324 (1904), Vol. 10, p. 454 [1912] East Indies. 
(Noesa); Suppl. Ent. Berlin, Vol. 3, p. 67 [1914] (Noesa); Brunetti, 
Fauna Brit. Ind. Dipt. Vol. r, p. 338 (1920). 
5. H. brachialis, Rondani, Ann. Mus. Stor. Nat. Genova, Vol. 7, p. 446 Borneo. 
(1875); Bezzi, Ann. Mus. Hungar, Vol. 2, p. 326, note (1904). 
6. H. brachystigma, Bezzi, ibidem, Vol. 2, p. 327 (1904). New South Wales. 
7. H. brunnipes, Brunetti, Rec. Indian Mus. Vol. 9, p. 12 (1913); Fauna (India. 
Brit. Ind. Dipt. Vol. r, p. 343 (1920). 
—. H. brunnipes, Stephens, Syst. Cat. Brit. Ins. Vol. 2, p. 260 (1829) no 
description. 
8. H. coniatus, nov. sp. (1). Costa Rica. 
9. H. culiciformis, Fabricius, Syst. Ent. p. 796 [1775] (Asilus); Fabricius, Europe. 
Spec. Ins. Vol. 2, p. 466 [1781] (Asilus) ; Fabricius, Mant. Ins. 
Vol. 2, p. 361 [1787] (Asilus caliciformis); Olivier, Encycl. Méth. 
Ins. Vol. 4, p. 270 [1789] (Asilus); Fabricius, Ent. Syst. Vol. 4, 
p. 389 [1794] (Asilus); Schrank, Fauna Boica, Vol. 3, p. 161 [1803] 
(Asilus); Fabricius, Syst. Antl. p. 172 [1805] (Dasyfogon) ; Schiner, 
Fauna Austr. Dipt. Vol. 1, p. 78 (1862) ; Strobl, Mitteil. Naturw. 
Ver. Steiermark, Graz, Vol. 29, p. 44 (1892); Lundbeck, Dipt. Dan. 
Vol. 3, p 15, 17 (1910); Wahlgren, Ent. Tidskr. Vol. 31, p. 46 
(1910); Carter. Ent. Mag. Vol. 47, p. 161 (1911), Vol. 48, p. 59 
(1912); Frey, Act. Soc. Sc. Fenn. Helsingfors, Vol. 37 (3), p. 8(1913). 
funebris, Fallen (not Meigen), Empid, Suec. var. p. 5 (1815). 
infuscatus, Zetterstedt, Dipt. Scand. Vol. 1, p. 234 (1842), Vol. 8, p. 2993 
(1849); Wahlgren, Ent. Tidskr. Vol. 3r, p. 46 (1910). 
(1) Mybos coniatus, nov. sp. — Very close to sciapterus, differing as follows : Length 4 mm.; third antennal joint 
orbicular, arista three and one-half times antennal length; fourth abdominal segment with dorsal patch of dust in place of 
the band ; hind femora much more slender, usually with eight spines in anterior row beneath; pygidial fringes usually less 
pronounced ; wings clear hyaline, stigma weak ; often the flexor seta at basal third of middle tibia is quite long. 
Six males, nine females, La Suiza de Turrialba, Costa Rica, Pablo Schild, collector. 
