Tin; CAx.ADiAx i;.\ tiimoi.dcist. 273 



Ernestia ampelus Walk. 



ilead at vi1)rissae about as thicl< as at l)asc of antennae; vlbrissae well 

 above tbe oral niarj^in. Palpi wllow. l{yes bairy. Cbeeks (below tbe eyes) 

 wbite pollinose on a black ground, subsbinint^" on tbe lower bairv part, a row of 

 bristles at tbe oral margin. Distance from tbe oral margin to tbe base of the 

 eye equal to about one-tbird of tbe eye beij^iit. Sides of tbe face covered with 

 silvery pollen; bare; narrowest width sli:;btly less than tbe length of the second 

 antennal segment. Facial ridges bristly on lowest fourth. Facial depression 

 silvery pollinose without an.y carina. .\ntenna.e reaching the lowest fourth of 

 the face, in male ;dl segments black except the distal enfl of the second, which 

 is usually reddish; in tbe fem.ale tbe brst two segments reddisb-vellow, the 

 third segment black; in both sexes tbe tbirrl segment about one and one-fourth 

 tunes as long as the second. .Arista thickened on basal two-hfths to one- 

 half, tbe i)enultimate segment a])out twice as long as broad. Width of front 

 at narrowest point measuring in male about tbe length of, in the female about 

 twice the length of tbe second antennal segment: the front silverv pollinose; 

 frontal vitta didl, dark-brown; at narrowest ])oint as wide or sligbtlv wider than 

 either side of the front just ce])halad of tbe ocellar triangle. Orbital bristles 

 present in female, absent in male; ocellars well developed, especially in the fe- 

 male; the single row of front.al bristles descending almost to the base of the 

 third antennal segment. 



Thorax subsbining, black, covered with gra\' ])ollen ; scutellum gray pol- 

 linose on a black ground that becomes rulous toward the ape.x. Tlu'ee sterno- 

 pleural and four dorsocenlral mocrochaetae, scutellum with three pairs of mar- 

 ginal macrocbaetae and an ai)ical cruciate pair. Legs black,, the middle tibiae 

 with two or more bristles on the front side near the middle, the hind tibiae 

 without a comb-like row of bristles on the outer side. Wings hvaline ; R.,,.- 

 ( third vein) with a group of two to seven hairs both above ;md below at the 

 jimction of \\._.^-.: bend of -\l,.j appendiculate in some of the males, destitute of 

 an appendage in most of tbe females. Tegulae white. 



Abdomen subsbining; silver\' ])ollinose on a black ground; tbe fourth ab- 

 dominal segment in the female rufous. Discal and marginal macrocbaetae i)re- 

 sent on second, third and fouiib abdominal segments. The hind margin of 

 the third tergite not conspicuousK' arcuate even in tbe male. Fifth tergite in 

 male black or rufous and marked oil from tbe sixth bv a suture onlv on the 

 lateral parts, its greatest length e(|ual to one-hfth tbe length ot tbe lateral part 

 of the tovu'th. The sixth and seventh .abdominal segments fornnng in tbe m;de 

 prominent genital segments. 



Male genitalia rufous. Tbe basal pait of tbe outi-r forceps covered 1)\' 

 a leaf-like expansion. Tbe basal part of tbe inner forceps with two conspicu- 

 ous projections placed side bv side, seemingly derived from forms m which a 

 keel-like projectif)n had become split. 



The horseshoe-like indentiu'e in tbe male extencls .about twri-fiftbs thr 

 distance to the base of the last sternile. 



Redescribed from a long series of males and lemales in the L^. S. Xa- 

 tional Museum and the National Collection at Ottawa. 



