156 The Philippine Journal of Science 1917 



along the orbits to their middle and in front entirely to cover 

 the narrow cheeks. Face elongate, narrower than the frons, 

 yellow above, whitish below and there with a prominent, oval, 

 strongly glistening blackish brown tubercle, the surrounding 

 area shining white; prselabrum prominent, triangular, whitish; 

 palpi whitish, narrow, almost bare ; proboscis yellowish. Anten- 

 nae short, inserted above the middle of eyes, the two basal joints 

 yellow, with some black hairs and a longer bristle above at end 

 of the second; third joint rather acute at end, not longer than 

 the first two joints together, deep black with narrowly yellow 

 base; arista blackish, incrassate at base, very long-plumose to 

 the end. Cephalic bristles strong and black; two pairs of 

 verticals, bent backward, the inner pair longer and placed more 

 forward; two pairs of frontoorbitals, likewise bent backward, 

 of equal size, one at level of the ocelli, the other before the 

 middle of the frons; no distinct ocellar or postvertical bristles. 

 In profile view the head is almost entirely occupied by the eyes, 

 which are rounded and of great size ; frons only a little prominent 

 above the antennae; ocelli placed just at middle distance be- 

 tween the inner vertical and the anterior frontoorbital bristles. 



Mesonotum entirely yellow, a little shining and a little darker 

 on dorsum, more orange and opaque on sides and on pleurae; 

 conical and exceedingly prolonged in front; on dorsum clothed 

 by short black hairs disposed in almost regular longitudinal 

 rows; quite bare on pleurae. Bristles black; no humeral; a 

 single notopleural, the posterior one, placed apparently on the 

 pleura, on account of the peculiar form of mesonotum, and just 

 below the very oblique and broadly interrupted suture; one 

 anterior and one posterior supra-alar; one pair of dorsocentrals 

 very near the scutellum; one mesopleural. Scutellum elongate, 

 triangular, with one basal and one apical pair of long bristles; 

 postscutellum of a very peculiar form, in shape of an obtuse 

 cone, more prominent than the scutellum itself, entirely yellow, 

 opaque; mesophragma short, yellow, whitish-dusted. Squamae 

 very small, yellowish, with brown border; halteres yellowish, 

 with brown knob. 



Abdomen narrower than the thorax, elongate, linear, of equal 

 breadth throughout; about as long as the mesonotum, entirely 

 yellow, opaque, with short black hairs ; the last segment whitish- 

 dusted ; the very small genitalia yellow, whitish-dusted, retracted, 

 destitute of appendages. Venter pale yellow, with black hairs 

 on the sides. Legs thin, not elongate; coxae and femora yellow; 

 tibiae and tarsi black, but on these last the elongate praetarsi of 

 the front pair whitish; front coxae with some short black hairs 



