i86 Records of the Indian Museum. [Voi,. VIII, 



MICROPEZINA E. 



Calobata trifascipennis, mihi, sp. nov. 



(PI vi, fig. 19). 



cf 9 Assam. Long 10 mm. (excl. ovipositor). 



Head. — Frons shining black, with a brilliant dark blue tinge on 

 lower part; a velvet black spot on the frons, elongate-triangular 

 in shape, its apex at the vertex, and with a small triangular 

 prolongation at its lower extremity; the minute ocelli set just 

 before the apex of the spot. Face dull blackish, a little brownish 

 yellow on lower margin of eyes, around the mouth border and 

 immediately below the antennae. Proboscis and palpi blackish, 

 antennal ist and 2nd joints blackish, 3rd dull brownish yellow, 

 with microscopic greyish pubescence; arista black, minutely 

 pubescent at base, where it is yellowish. Back of head shining 

 brownish black, the normal pair of vertical bristles and a pair of 

 post- vertical ones. (In the type there is a supplementary very 

 short bristle in front of one of the vertical ones). 



Thorax, scutellum and metanotum dull blackish. (Bristles 

 mostly broken off). One pair of dorso-central, near hind margin, 

 one or two supra-alar and an apical pair of scutellar bristles. 



Abdomen blackish, a little blue tinged, hardly shining, an 

 indistinct greyish band on hind margins of 2nd and 3rd segments; 

 belly obscure, genitalia large. 



Legs. — Coxae black, fore legs dark brown, tips of metatarsus 

 and remainder of tarsus whitish yellow. Posterior femora and 

 tibiae brownish yellow; middle tibiae sometimes darker; posterior 

 tarsi mainly black for a greater or less distance from the tips. 

 Posterior femora with three indistinct or incomplete blackish 

 bands, the first basal, the second just beyond the middle, the 

 third subapical, all these bands subject to variation in extent and 

 intensity, sometimes reduced to a mere trace. The hind femora 

 have in addition a narrow bright yellow ring at the extreme base. 



Wings nearly clear; ist posterior cell closed immediately 

 before the border. An ill-defined but distinct, brownish transverse 

 band across the middle from the costa to just below the discal cell, 

 its proximal edge passing distad of the anterior cross-vein. The 

 wing tip still more indistinctly but obviously clouded brownish ; an 

 irregular, indistinct brownish spot over the ist basal cell and basal 

 half of the discal cell. Halteres very small, obscurely brown. 



Described from 3 examples ; Dibrugarh, 17 — 19-xi-ii. 



N.B. — Judging from the description this form appears to be 

 new, although in such a critical genus as Calobata the species 

 require very careful comparison, and the Oriental ones are badly 

 in want of complete revision. 



