ISONEUBOMTIA. 67 



at base. Palpi elougate, incurved. Ocelli very distinct, placed on 

 a vertical protuberance, the outyr ones very large, the middle one a 

 little below the others. Winc/s with all the veins equally and very 

 strongly developed, except the almost obsolete base of the 4th vein. 

 Auxiliary vein ending before the middle of the wing, just beyond 

 the base of the 3rd longitudinal ; subcostal cross-vein placed 

 just beyond the humeral cross-vein. The 1st longitudinal vein 

 thickly spinose with several rows of small spines, the remaining 

 veins each with a single row of microscopic spines. Posterior 

 cross-vein \\\ its normal position at proximal end of the coalesced 

 portions of the 3rd and 4th veins. The 5th, (itl), and 7th veins 

 equally strong, arising close together near the base of the wing,, 

 this strength of the veins being the chief generic character. 

 Range. Assam, Ceylon. 



24. Isoneuromyia annandalei, sp. nov. (PI. Ill, tig. 5.) 



5 . Head mainly blackish, frons bare, with blue-grey dusting, 

 whitish above the antennae, ocellar protuberance blackish. Some 

 stiff black hairs beliind the head. Epistome and palpi from 

 creamy white to brownish yellow. Antennae yellowish to reddish 

 brown, a little blackish in some specimens. Proboscis brown. 

 Thorax blackish. Dorsum with blue-grey dusting, a median 

 black (not always very distinct) stripe which may be widened in 

 the middle and which dies away towards the posterior margin. 

 Anterior margin of thorax, just below dorsum, light creamy 

 yellowish, the colour extending narrowly laterally. Sides of 

 thorax brownish, pleurae with white or bluish-white dusting, also 

 the metanotum. Whole thorax shortly pubescent, some stiff 

 bristles below the brownish humeri, and on the lateral margins 

 of the thorax. Scutellum with stiff hairs on the hind margin. 

 Abdomen black, minutely pubescent, base of each of first five 

 segments with a somewhat narrow but distinct yellowish band, 

 which appears snow-white if viewed from in front, last segment 

 all black. Genital organs small, oval, creamy yellow. Legs : coxae 

 yellowish, with some stili hairs, black at tips, fore pair blackish 

 on outer side. Femora brownish yellow, irregularly blackish at 

 base and tips, with short black hairs, which are generally stronger 

 on the upper side, giving it a blacker appearance. In one 

 example all the femora nearly wholly black. Tibiae and tarsi 

 blackish. Wings pale grey, rather glassy in appearance, distinctly 

 iridescent. All the veins very distinctly brown, and all of equal 

 strength (except basal part of 4th longitudinal). A brown suf- 

 fusion towards the wing-tip, darkest on its anterior part, 

 commencing on the costa, exactly by the upper branch of the 

 3rd vein, and extending hindwards and outwards in gradually 

 diminishing intensity, sometimes retaining its dark colour as far 

 as the hind margin. A narrow brown suffusion over the coales- 

 cence of the 3rd and 4th veins and along the faint basal part of 



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