106 I.KPTID.E. 



like prolongation of each yellowish white, last seven joints 

 (making with scape 32 in all) with their comb wholly yellowish 

 white ; proboscis orange-yellow. Thorax and abdomen orange ; a 

 large black spot on pleurae in front of wing-base and another just 

 behind wing-base; sternopleura shining black; abdomen with 

 '2nd segment much the longest ; hind border of each narrowly 

 black, less distinctly so on 5th and 6th segments. Legs orange- 

 yellow ; hind coxae shining black ; hind femora and tibiae with 

 basal two-thirds of each black ; hind tarsi all black. Wings grey, 

 subcostal and marginal cells blackish ; halteres yellow. 



Length, 9 mm. 



Described from a unique d in t.he Indian Museum from 

 Peshoke Spur, Darjiling, 2000 ft., vi. 1916 (L. 0. Hartless). 



70. Rhachicerus unicinctus, sp. nov. (PI. II, fig. 2.) 



$ . Head with frons brilliantly shining black, longitudinally 

 furrowed, at vertex one-third of head, slightly wider just above 

 level of antennae ; face dull black seen from below, but at least 

 upper part brilliantly white seen from above, narrowing towards 

 mouth ; proboscis short, thick, bulbous, orange, as are the up- 

 turned cylindrical palpi, slightly thickening towards tips ; eyes 

 brown; occiput moderately shining black, with a little short 

 brown pubescence towards margins. First two joints of antennae 

 blackish above, orange below ; 3rd with upper side and tips of 

 rays black, the intermediate part of rays orange-yellow ; 20 or 

 21 joints present in flagellum, according to whether the small 

 terminal prolongation is part of the last rayed joint or not: the 

 flattened irregularly-shaped elevation on which the antennae are 

 placed lemon-vellow. Thorax shining black, dorsum finely punc- 

 tate, with extremely short yellowish pubescence ; humeri and 

 mesopleurae dull shining yellowish ; scutellum like thoracic 

 dorsum. Abdomen slightly shining black; 1st segment very 

 short; 2nd longest, with a yellowish transverse band of moderate 

 width, of which the hind border lies just in front of middle of 

 segment and is punctuated by a row of small indentations, almost 

 giving the appearance of two segments; 3rd and 4th segments 

 barely narrower than 2nd ; 5th rapidly narrowing from base to 

 tip ; 6th, 7th, and 8th extremely narrow and very elongate, having 

 a telescopic appearance, the last one possibly forming two segments 

 (making nine in all) in addition to the two pale yellow elongate 

 lamellae ; whole abdomen with sparse short yellowish-white 

 pubescence; venter black, 2nd segment mainly dull yellowish. 

 Legs mainly orange-yellow ; trochanters, about basal halt of 

 femora, and hind tibiae wholly black. Wings yellowish grey, 

 vitreous, stigmatic region a little yellowish brown, a slight infus- 

 c.'ition at wing-tip ; halteres yellowish. 



Length, 8 mm. 



Described from one $ in the Indian Museum from Peshoko, 

 Darjiling, 1000 ft., 26, v.-M, vi. 1916 (Gravely), 



