io6 Memoirs of the Indian Museum. [Vol,. Ill, 



The head is as high as broad, and the eyes are rounded; frons reddish yellow, 

 a little darkened above the antennae; arista shortly plumose. 



The two black bands of the thorax are distant, complete, narrowly interrupted 

 at the transverse suture, beginning after the external sc. and ending before the 

 scutellum at the level of the internal posterior sa.; a black triangular spot in front 

 of the scutellum, between the prsc. ; humeri, sides and posterior portion of the dor- 

 sum whitish yellow, as also the mesopleura; pteropleura blackish; metanotum black , 

 with a whitish lateral spot; hypopleura white. Scutellum whitish yellow with an 

 apical black spot. All the bristles black. Haltères yellow. 



Abdomen ferruginous, with pale pubescence; the transverse band on the hind 

 border of the third segment is narrowly interrupted in the middle ; venter black ; 

 male genitalia not prominent. Legs wholly yellow; coxae with some bristles; front 

 femoral row of bristles numbering 7 or 8, middle tibiae with 4-5 bristles in the middle 

 on the outside, hind tibiae with a complete row. 



Pattern of the wings brownish yellow, disposed as in Macquart's figure, but the 

 last cross-band not reaching the fore border and not connected with the band on the 

 posterior cross- vein. 



The species was originally described from East India. A single specimen from 

 Sylhet, Assam, 26-iv-o5 {E. A. Hall). 



15- Gastrozona montana, n. sp. d , ? . 

 {PI. viii, fig. 17.) 



Very like the preceding but distinguished by the entirely yellow scutellum and 

 somewhat different pattern of the thorax, abdomen and wings. Length 7 mm. 



Head yellow, with a black geminate spot on the occiput and a small black ocellar 

 dot; all the bristles black, some yellowish hairs on the lower portion of the occiput; 

 eyes not narrowed; cheeks rather broad; antennae a little shorter than the face, the 

 third joint attenuated at the tip but not pointed, with a short plumose arista; pro- 

 boscis and palpi yellow. 



Thorax ferruginous on the back, with very short yellowish pubescence and black 

 bristles; 2 npL; scp. long and strong, black; the female has a black notopleural 

 stripe, which in the male is reduced to a less distinct spot on the posterior ntpl. ; in 

 front of the scutellum the female has a broad shining black cross-band, which in the 

 male is broken into three spots. Pleura with the usual broad whitish stripe, from 

 the humeri through the mesopleura to the sternopleura ; this stripe is margined with 

 brown above and below; sternopleura ferruginous, with the upper border black; 

 metanotum black, with two lateral spots, which are fused with the hypopleural spot, 

 forming a broad white yellowish patch. Scutellum entirely of a pale yellow colour, 

 with four strong bristles. Squamulae and haltères dark ferruginous in the female, pale 

 yellow in the male. All the black markings of the thorax are less distinct in the male. 



Abdomen ferruginous at the base, greyish at the end, with long pale pubescence 

 and black bristles; the first transverse black band is broad and entire, in the female 

 filling the whole of the second segment and a narrow fore border of the third ; the 



