212 On the Two Genera Nusa and Pogonosoma. 



nearly the same colour as the abdomen, with white pubes- 

 cence. Wings tinged brown. 



Length 19 mm. 



Face blackish brown, the tubercle large, covered with 

 stout black bristles, forming the moustache, a few fine white 

 hairs intermixed. Cheeks with long fine white hairs, a few 

 shorter black ones on each side below the antennae. Palpi 

 with black liairs. Beard white. Hind part of head with 

 bristly black hairs, becoming weaker and reaciiing round to 

 the proboscis. On the ocelligerous tubercle two weak black 

 bristles. Antennce with the first two joints blackish brown 

 and with stout black bristles (third broken off). Thorax 

 dull blue, with brighter metallic glittering patches on the 

 sides, devoid of the brownish-yellow tomentum on dorsum, 

 which is nearly bare of pubescence anteriorly, but the sides 

 have long soft black hairs disposed in groups ; prealar bristles 

 stout, three in number, postalar two in number. Posterior 

 part of dorsum with rather numerous weak black hairs, and 

 the tomentum here is whitish. Scutellum dark blue, some- 

 what shining, with no bristles (denuded) ; on the specimen 

 from Khasi Hills there are two weak black ones. Abdomen 

 almost devoid of pubescence, sides of anterior segments with 

 long white hairs ; on the posterior segments shorter black 

 hairs predominate ; on each segment one or more stout black 

 bristles are present on the sides, and the second, third, and 

 fourth have small triangular white tomentose spots. Ovi- 

 positor short, no longer than the last segment. Legs dull 

 bluish, but the anterior pair are more brownish than blue, 

 and the same is the case with the middle pair ; pubescence 

 long, white, thickest on the tibiae ;. on the femora it is black 

 above and intermixed with white hairs below ; the tarsi with 

 black hairs and bristles ; there are numerous long black 

 bristles on the tibise and one or more stout ones on the hind 

 femora towards the apices ; the underside of tibiee with thick 

 brush-like foxy-red hairs. Wings tinged brown, paler at the 

 extreme base, with clear white spots in all the cells on the 

 posterior border except the apical one, and including the 

 fourth posterior cell : the first posterior cell is widely open, 

 the brown colouring is more intense on the anterior border in 

 the centre. Halteres pale. 



A very much damaged specimen from Khasi Hills, India 

 [F. W. L. Sladen), seems identical with the type ; it is also 

 a female. A female from Trincomalee, Ceylon, is very nearly 

 allied to these, but appears somewhat different. 



