EXOPEOSOPA. 83 



hairs and an erect black pubescence ; proboscis but little, or not, projecting beyond the 

 oral edge. Antenna? dark brown, reddish at the base ; third joint of the usual elongated 

 conical shape, with a style less than half its length, and a bristle at the end of the style 

 (the bristle seems to be longer than in the cognate species, but, owing to the dust which 

 covers the specimens, I cannot be very positive about it). The ground-colour of thorax 

 and abdomen is black ; the distal half of the scutellum reddish. Round the thorax are 

 the usual tufts of yellowish hairs, and black, rather long, bristles on the pree-alar and 

 post-alar callosities and on the scutellum. On the abdomen the usual whitish cross- 

 band on the second segment ; silvery scales on the last two segments in the male, 

 yellowish-white ones (?) in the female ; the intermediate segments show traces (rather 

 rubbed off) of black and yellow scale-like hairs, and tufts of black hairs on the sides. 

 Legs brown, more reddish on the tibiae, beset with yellowish scales. Wings with the 

 first posterior cell closed and petiolate ; apex, including the expanded portion of the 

 marginal cell, and the distal ends of the inner submarginal and first posterior cells, 

 hyaline ; a brown spot, isolated from the rest of the brown, at the proximal end of the 

 second posterior cell ; distal (larger) half of the discal cell, and the third and fourth 

 posterior cells (except the proximal end of the fourth), hyaline ; a brown cross-band 

 begins with two brown spots upon the origins of the second and third veins, covers the 

 proximal end of the discal cell and the great cross-vein, and crosses the middle of the 

 anal and axillary cells ; root of the wings brown. 



4. Exoprosopa rhea, sp. n., $ . (Tab. I. fig. 14.) 



Wings black, the apex hyaline, hyaline spots forming two cross-bands, the one nearest the base very narrow ; 



body black, with tufts of bright rufous hair on the sides of the thorax and on the base of the abdomen;. 



the latter bluish. 

 Length of the body 11-12 millim. 



Hah. Mexico (Craven). 



Face and front bluish-black, beset with black hair ; antennal scapus black, with black 

 hairs (third joint broken). Thorax black ; collar beset with rufous hair, forming a tuft 

 on each side in front of the wings ; similar tufts behind the root of the wings and at 

 the base of the abdomen (on the sides of the first and second segments), the rest of 

 the abdominal margin beset with long, black hair, forming a dense fringe round the 

 whole abdomen; surface of the latter bluish-black; small white spots, formed by 

 white scales, on each side of segments 3 to 5, a pair of similar spots in the middle of 

 each of the segments 4 and 5. Halteres brown. Legs brown. Wings black, except the 

 apex, beyond the end of the first vein, and with two cross-bands of hyaline spots arranged 

 as follows : — the first narrow, and formed by a series of disconnected spots, one in 

 the proximal half of the first basal cell, a larger one in the second basal cell, and 

 two others not far from the proximal ends of the anal and axillary cells ; the second 

 consisting of three small spots in the marginal cell, placed near the proximal ends of 



m 2 



