124 DIPTEEA. 



segment which are again black ; segments 6 and 7 are black in the middle, and have tufts of yellowish- 

 white hairs on the sides, with some golden hairs nearer the middle. The rest of the upper surface of the 

 body black, except some scattered reddish-fulvous appressed hairs in front of the scutellum and some- 

 similar hairs along its posterior edge, and some fulvous hairs on the first abdominal segment ; the rest of 

 the surface of the abdomen clothed with short black hairs and soot-like appressed scaly pile. On the 

 venter the hind margins of the segments have fringes of whitish hairs. Legs black. Antennae black ;. 

 basal joints very short; third joint short, conical, with a long style, tapering at its base. Face black, 

 beset with orichalceous short hairs, the hairs whiter near the orbits; the black front with similar 

 orichalceous hairs above the antennas, mixed with a black pubescence; vertex comparatively narrow (6)', 

 occiput black, the lower occipital orbits silvery. The antero-proximal two thirds of the wings of a deep 

 brownish-black, not variegated by any darker or lighter shades on the cross-veins and bifurcations ; the 

 boundary of the black begins at the tip of the anal cell, forms an angle at the distal end of the discal cell, 

 and then reaches the end of the first vein : thus the extreme distal edge only of the discal, the end of the 

 first posterior, two thirds of the second submarginal, the curved portion of the first submarginal, and the 

 enlarged portion of the marginal cells remain hyaline. 

 Length 11 millim. 



Eab. Costa Rica, Cache (Bogers). 



A single male. 



The front tibiae are smooth and not beset with spinules ; the front tarsi have small 

 ungues, and a delicate, erect pubescence on both sides ; the latter are less slender and 

 less tapering than in those species which have almost Exoprosopa-like tarsi, and the 

 joints are more distinct. 



14. Anthrax ephebus, sp. n., s $ . 



The dark greyish-brown ground-colour more or less hidden under a yellow tomentum, which on the abdomen 

 forms broad cross-bands occupying almost the whole segment and leaves on the posterior margins but 

 narrow spaces clothed with a black tomentum ; the sides of the abdomen have fringes of similar yellow 

 hairs, interspersed with tufts of black hair which begin with the end of the second segment ; venter 

 with yellow hairs. Thorax beset with yellow hairs, a little more reddish in front ; rufous macrochsetae 

 on the prse- and post-alar callosities and on the scutellum. Face conically projecting ; proboscis withdrawn 

 (sometimes a little projecting) ; face and front with a yellow, appressed tomentum ; front with a black, 

 erect pubescence. Antennas brown ; third joint short, conical, gradually merging into a long style. 

 Halteres with a yellowish knob; stem brown. The reddish or brownish ground-colour of the legs 

 is hidden under reddish scales ; the front tibiae beset with spinules ; tarsi brown, the front pair with 

 distinct joints, comparatively large ungues, and beset with microscopic bristles on the underside (the 

 delicate, erect pubescence, which, in some species, exists on both sides of the front tarsi, is not visible 

 here) ; the ungues with a tooth-like projection at the base. Antero-proximal half of the wings brown, 

 within which the bifurcations and cross-veins on both sides of the discal cell are clouded with darker 

 brown, the boundary of the brown rather diluted ; axillary cell almost entirely hyaline ; the brown in the 

 anal cell does not reach beyond the posterior cross-vein, it occupies a little of the fourth and third posterior 

 cells, less than half of the discal, and has in the first posterior and first submarginal cells an evanescent 

 boundary running obliquely towards the end of the first vein ; in the hyaline portion there is a brown 

 cloud on the bifurcation of the third vein, and another on the cross -vein separating the second posterior 

 from the discal cell. 

 Length 9-12 millim. 



Eab. Mexico, Tehuacan (Sumichrast). 



Two male and two female specimens in Prof. Bellardi's collection. 



These specimens are dusty and abraded, especially about the thoracic dorsum and 



