62 
19. 
20. 
21. 
22. 
23. 
24. 
26. 
DIPTERA. 
Anal segment black, only laterally with a whitish reflection ; 
smaller species (5°5 millim.) . . . . 2... . ee 
Abdomen conical . . 
Abdomen ovate . . . . 
Body grey, with black markings; larger species (12 millim.) 
Body shining black, with whitish markings; smaller species 
(6°5 millim.} 
Palpi black 
Palpirufous . . . . . . 1 ew ee eee 
Hind tibiz outwardly fringe-like with bristles. . . . 
Hind tibie outwardly with bristles of unequal length 
‘Abdomen shining black or piceous (sometimes laterally tes- 
taceous), with more or less conspicuous whitish reflections 
Abdomen grey or cinereous (sometimes laterally testaceous), 
with blackish reflecting spots or black hind borders to the 
segments . oe 
Scutellum black . 
Scutellum piceous orrufous. . . . . ..... 
. Palpi normal; vibrisse scarcely longer than the other bristles 
onthe oral margin. . . .... ee ee 
Palpi filiform ; vibrisse distinctly longer than the other bristles 
on the oral margin . . . 
Face laterally ochraceous 
Face whitish . 
1. Exorista obscurata, sp. n., ¢. 
Head and thorax ochraceous ; abdomen grey; frontal band, antenna, palpi, four thoracic stripes, hind borders 
nigricauda, v. d. Wulp. 
20. 
21. , 
angustata, v. d. Wulp. 
exilis, v. d. Wulp. 
22. 
23. 
ignobilis, v. d. Wulp. 
humilis, v. d. Wulp. 
24:. 
26. 
maura, v. d. Wulp. 
25. 
glabricula, v. d. Wulp. 
tenuipalpis, v. d. Wulp. 
flavicans, v. d. Wulp. 
griseomicans, v. d. Wulp. 
of the abdominal segments, and legs black; abdomen with discal and marginal macrochete ; wings 
infuscated along the costa. 
Length 8 millim. 
Front ochraceous, narrower than the diameter of the eyes; frontal bristles descending on both sides in a single 
row beneath the second antennal joint; face and cheeks pale yellow; vibrissa surmounted by some 
shorter bristles ; beard whitish ; eyes pubescent. Antenne shorter than the face ; second joint bristly on 
its upper part; third joint three or four times as long as the second ; arista thickened not quite to the 
middle. The stripes of the thorax very conspicuous, abbreviated behind, especially the middle ones ; the 
outer stripes interrupted on the transverse suture; scutellum cinereous. Abdomen conical, greyish- 
cinereous ; the first segment black, the following segments with broad black hind borders ; macrochete 
in the middle as well as on the hind margins of the segments. Middle tibiee with two long bristles, one on 
the outer and one on the inner side; hind tibie outwardly with a row of short and with some longer 
bristles ; foot-claws anc pulvilli elongate, the pulvilli brownish-yellow. Tegule yellowish-grey. Wings 
slightly infuscated on the anterior half or along the costa; small cross-vein on or a little before the 
middle of the costal cell; apical cross-vein straight ; posterior cross-vein distinctly curved. 
Hab. Mexico, Atoyac in Vera Cruz, Teapa in Tabasco (H. H. Smith). 
Five male specimens. 
