Ghrysotoxum. 577 



second shorter than the first; arista as long as third joint, brownish 

 at the base. Thorax æneous, shining, with two somewhat narrow, 

 greyish stripes, abbreviated behind themiddle; the yellow, longitudinal 

 side spots present as usual, moderately interrupted; thorax is clothed 

 with somewhat long, yellowish brown hairs, longest behind; above 

 the wing-root are dense, black hairs. Scutelluin æneous black with a 

 narrow yellow margin, and with similar hairs as on thorax, among 

 which some few black. Pleura with oniy the spot on mesopleura 

 present ; the hairs long, yellow. Abdomen black, rather shining, a 

 little duU only on second segment before the hind margin; it has two 

 yellow bows, one on second and one on fourth segment; the first 

 bow is broad, a little raised, just interrupted in the middle, and it 

 reaches the side margins with just the hinder corners; the second 

 bow is not interrupted and it does not reach the margins; on 

 the third segment are generally a pair of very narrow, shorter 

 or longer lines as traces of a bow; the fifth segment has a small, 

 interrupted bow or this bow is reduced to two small spots; the 

 segments have narrow, pale hind margins, sometimes widening at 

 the hind corners, on second segment the margin present only in the 

 middle and generally also at the sides; abdomen is clothed with short 

 hairs, which as usual mainly follow the ground colour, and there are 

 yellow hairs about the traces of the bow on third segment; the hairs 

 at or beneath the side margin are yellow, a little longer, and long 

 at the basal corners. Genitalia small, black and partly black-haired. 

 Venter black, shining, with a broad, yellow band at the base of the 

 third segment; the hairs are long, yellow on the basal half, black at 

 apex. Legs yellow, anterior femora with the basal part or half black, 

 hind femora black to near the apex ; hind tarsi more or less darkened 

 above, especially metatarsus; the tibiæ more or less canary yellow; 

 the legs are somewhat thinly haired, but the hairs below the posterior 

 femora long ; all the hairs are yellow or there are some black behind 

 the apical part of the anterior femora and below the apex of hind 

 femora. Wings yellowish on the basal half between costa and the 

 discai vein, and after this yellow part with a large, brown spot stretching 

 about to the end of the subcostal vein and down into the cubital 

 cell, on the inner part to the cubital vein ; the cubital vein somewhat 

 deeply curved. Squamulæ somewhat blackish with brownish yellow 

 fringes. Halteres yellow. 



Female. Similar; vertex and frons broad, widening downwards, 

 black; the frons with large, greyish yellow dust spots; the hairs very 

 short, pale. Eyes very short-haired. Thorax and scutellum with ex- 

 ceedingly short hairs, black behind on thorax. Abdomen generally 



37 



