Die nord- u. südamerikan. Arten der Gatt. Conops. 155 
short thick. Thorax black, opaque; near the humeri and behina, 
as also on the scutellum, thickly golden pollinose; pleurae diffusely 
pollinose; abdomen opaque black; the hind margin of the first 
three segments, and the fourth and fifth segments, thickly light 
golden pollinose. Legs reddish brown, the base of the tibiae and 
the basal joints of the tarsi yellowish. The brown of'the wings 
extends to the third vein and through the middle of. the first 
posterior cell; costal and subcostal cells lighter colored. Length 
11 mm. — Two specimens. 
Chapada.‘ 
19. Conops argentifaeies Will. (= C.nobilis Will.?) 1. c., p. 45. 
Diese Art steht meines Wissens nur in Willistons Bestimmungs- 
tabelle, ohne daß er eine Beschreibung hinzugefügt hat.- Andrer- 
seits steht unter den Artbeschreibungen auf pag. 45 die Beschrei- 
bung von Conops nobilis Will., die wiederum in der Bestimmungs- 
tabelle fehlt. Ich vermute, daß Williston für seine neue Art beide 
Namen vorbemerkt hatte und nun auch beide vergab, daß also 
C. nobilis Will. die Beschreibung von C. argentifacies Will. ist, die 
ich hiermit bei genannter Art anführe: 
Q: „Head black; front, below the vertical callosity, except a 
crescentic space above the base of the antennae opaque; face, on 
the depression, with a conspicuous, light yellow silvery reflection; 
in an oblique light from above the ground-color wholly concealed. 
Antennae black; thereddish first joint about two-thirds the length 
of the third joint; te third joint about two-thirds of the length 
of the slender second joint; third joint of the style with a short 
bristly extremity. Thorax black, lightly pollinose, opaque; on 
the front margin, and near the humeri velvety; in the middle in 
front distincetly whitish when seen from behind. Abdomen black, 
subshining; second segment deep opaque black, save on the anterior 
part, where it is whitish pollinose; ventral process of the fıfth 
segment small. Legs black; the tarsi and claws, save their extreme 
tips, light yellow; pulvilli very large, yellow; the tarsi dilated. 
Wings unequally brown in front, scarcely extending beyond the 
third vein, save in the first posterior cell; the costal cell and the 
outer part of the wing in front of the third vein of a lighter color. 
Length 12 mm. One specimen. 
Chapada.‘“ 
20. Conops grandis Will. 1. c., p. 44. 
Q: „Front black, the lower margin of the vertical callosity 
reddish; just below the callosity opaque, elsewhere shining. An- 
tennae black; the second and third joints of nearly equal length; 
the first joint about two-thirds of the length of the second joint; 
style with a long bristly extremity. Face and cheeks light yellow, 
the orbital margins of the former silvery, or light golden pollinose. 
Thorax black, the mesonotum shining, the pleurae lightly whitish 
5. Heft 
