14 DIPTERA. 
densely beset with black hairs and strong black bristles. Legs black (the front femora outwardly with 
whitish reflections), beset with many bristles, those of the outward basal half of the middle tibiz longer. 
Tegule dark brownish-grey. Wings grey; posterior cross-vein oblique and a little curved at the base. 
Length 12 millim. 
This insect is perhaps conspecific with Jurinia ceruleo-nigra, Macq. (Dipt. Exot., 
Suppl. i. p. 146. 13, t. 13. f. 8), from Colombia, which, according to the hairy eyes, 
must be included in the genus Hystricia. ‘The principal differences between the two 
descriptions consist in the following points :— 
J. ceruleo-nigra. H. cyaneiventris. 
Head pale yellowish. ' Head pale cinereous. 
Third joint of the antenne a little longer Third joint of the antennz twice as long as 
than the second. the second. 
Thorax black, with whitish tomentum (no Thorax with four longitudinal black stripes. 
mention is made of dark stripes). 
Wings brown. Wings grey. 
5. Hystricia pollinosa, sp.n., ¢ ¢. (Tab. I. fig. 8.) 
Blackish ; thorax grey, with four black stripes; head pale yellow (¢) or white (?); antennz and legs black, 
the third joint of the antenna a little longer than the second ; palpi ochraceous ; foot-claws yellow, with 
black tips ; wings brownish-grey. 
Length 165-19 millim. 
Head of the male straw-yellow, of the female white, with the oral margin yellowish ; face vertical, somewhat 
prominent below; front in the male narrowed behind, greyish-yellow, with a black median band, that of 
the female broad and blackish ; pilosity of the front, cheeks, and occiput (and the beard also) pale yellow ; 
frontal bristles stout, but not numerous, some few (placed close together) descending to a little beneath 
the base of the antenne; vibrisse robust, surmounted by some shorter and weaker bristles; before the 
beard are three bristles. Antenne black, in some specimens the end of the second joint and the base of 
the third rufous ; on the upperside of the second joint are some rather long bristles; third joint a little 
longer and broader than the second, rounded at the end; arista indistinctly jointed. Proboscis shining 
black ; palpi ochraceous, enlarged and with some short black bristles towards the end. Thorax and 
scutellum black, sometimes with faint metallic reflections; thorax above with light grey tomentum, 
blackish pilosity, and four longitudinal black stripes, between which are rows of bristles ; behind the root 
of the wing is a rufous spot; pleure above the front and hind coxe with yellowish tomentum and partly 
yellow hairs; scutellum densely beset with bristles, two of which at the hind margin are thicker and 
more spine-like. Abdomen black or reddish-piceous, everywhere beset with black spines, which in the 
female are very numerous beneath the anus. Legs black, the front femora outwardly with grey tomentum 
and yellowish hairs; for the rest the pilosity is blackish and the bristles rather numerous and stout; at 
the underside of the middle femora are three very strong bristles; foot-claws pale yellow, with black 
tips. Tegule and wings brownish-grey; small cross-vein oblique, placed a little before the middle of the 
discal cell; apical cross-vein curved inward at its base; posterior cross-vein slightly curved. | 
Hab. GuateMata, San Gerdénimo (Champion); Costa Rica, Rio Sucio and Cache 
(Rogers). 
Two male and two female specimens. 
