44 DIPTERA. 
39. Vibrissz absent (next the oral margin several short bristles, 
among which the two vibrissz cannot be distinguished from 
the others) . 2. 1. 1 ee ee ee ee ee ee 40. - 
Vibrisse distinct . . . . . . . . Al. 
40, Wings without a costal spine (unusually dilated ; in the male) ; | 
second vein close to the costa and far from the third . . Neoptera, v.d. Wulp. Its 
Wings with a costal spine (not dilated in the male) ; second 
vein at an equal distance from the costa and from the third 
vein; (abdomen very transparent and with black spots). . Cenosoma, v. d. Wulp. 166 
41. Vibrissze inserted at some distance above the oral margin. . Telothyria, v. d. Wulp. /67] 
Vibrissz inserted just at the oral margin . . . . . « . 42. 
42, Abdomen elliptical, conical or ovate. . . . . . . . . Anisia, v. d. Wulp. [ &b 
Abdomen rounded. . . . . .. 1 6 » es . . « Spherina, v. d. Wulp. 205— 
43. Apical cell long-petiolated . . . . woe ee ew AA 
Apical cell short-petiolated or closed at the wing-margin. . 45. 
44. Cheeks with a row of bristles close to the orbits of the eyes . Rhinophora, Rob.-Desv. 295° 
Cheeks bare . . . ........... . « Leweostoma, Meig. 206 
45, Third antennal joint short. . . . . . . . . . . . Clista, Meig. 297 
“Third antennal joint long . 2. 2... ee...) Myothyria, v. d. Wulp. 206 | 
DISTICHONA, gen. nov.* 
Head a little broader than the thorax; front rather broad, somewhat prominent; frontal bristles in a double 
row on each side of the frontal band; face perpendicular; vibrisse at a little distance above the oral 
margin, which is not prominent; facial ridges with a row of bristles; cheeks broad. Eyes more or less 
* oo pilose, descending to the vibrisse. Antenne shorter than the face; third joint more than twice as long as 
Wet iw the second ; arista thickened nearly to the end, distinctly jointed, sometimes nicked. Proboscis exserted ; 
palpi filiform. Abdomen elongate-oval; first segment shorter than the following; second and third 
segments only with marginal macrochete. Wings without a costal spine; curvation of the fourth vein 
angular, but without appendice ; apical cell opened at some distance from the wing’s tip. 
This genus may be compared with Cnephalia, Phorocera, and Baumhaueria: from 
the first it differs by the hairy eyes and a less broad front; from Phorocera by the 
thick and distinctly-jointed arista; and from Baumhaueria by the hairy eyes. It 
contains but a single species. 
1. Distichona varia, sp. n., ¢ @. (Tab. III. figg. 2; 2a, head; 26, head in 
profile, ¢ .) 
Cinereous ; frontal band, four stripes on the thorax, reflections on the abdomen, and the antenne and legs 
black ; palpi rufous. 
Length 8°5 millim. ; 
Front in both sexes broader than the diameter of the eyes ; frontal band black, nearly as broad as the sides, but 
sometimes becoming narrower or disappearing in a greyish reflection ; inner row of the frontal bristles 
descending to beneath the second antennal joint ; in some specimens the colour ‘of the face and cheeks 
has a tendency to ochraceous. asal joints of the antenne more or less rufous and of equal length ; 
third joint three or four times as long as the second; penultimate joint of the arista half as long as the 
* dis (double); orixos (row). 
