Ghrysogaster. 99 



third joint; the antennæ are brown, paler beneath, second joint with 

 only inconspicuous dark bristles beneath. Eyes with a distinct dark 

 transverse band across the middle. Thorax brass-coloured or more 

 greenish, coarsely and somewhat rugosely punctate and hence dull; 

 it has four brown or purplish, quite dull stripes, two in the middle, 

 abbreviated behind, and one on each side, interrupted at the furrow; 

 the middle stripes darkest. The disc is clothed with very short, yel- 

 lowish hairs. Scutellum marginate and with one or a couple of more 

 or less distinct transverse furrows. Pleura less punctate, shining, with 

 a little longer, sparse, pale hairs. Abdomen brownish black, dull, the 

 sides and the apical part brassy or greenish and shining, also the first 

 segment less dull; abdomen is clothed with exceedingly short, dark 

 hairs, paler at the sides and a little longer and pale at the apex; they 

 are also longer and likewise pale at the basal corners. Venter greenish 

 metallic, shining, with short pale hairs. Legs metallic greenish, knees 

 yellowish, this colom* stretching down the basal part of tibiæ; tarsi 

 with the two first joints more or less yellowish, the rest black; hind 

 metatarsi slightly thickened. The legs with short and inconspicuous 



Fig. 34. Wing of O. elegans cf- 



mainly pale or brownish hairs, hind femora black setulose beneath. 

 Wings very slightly tinged; stigma yellow; upper marginal cross-vein 

 somewhat recurrent, slightly sinuous. Squamulæ dirtily whitish with 

 a brownish margin and a yellowish fringe. Halteres yellow. 



Female. Frons and epistoma not very broad, but in the height 

 of the antennæ considerably broader than the diameter of the eye; 

 frons with a slightly marked middle channel or stripe, and in front 

 of it a small dot-like impression ; to each side there are some oblique 

 cross-furrows ; the frons is bluish above, Eyes with a dark band as 

 in the male, but it is placed a httle higher, above the middle. Fourth 

 abdominal segment with a very small, almost imperceptible wart in 

 the middle of the hind margin. Anterior tarsi with the basal joints 

 darker than in the male or brownish. 



Length 5 to about 6 mm. 



7* 



