Ghrysogaster. 



103 



paler beneath ; second joint with pale bristles of some length beneath. 

 Eyes without band. Thorax about as in elegans, the duU stripes 

 somewhat distinct; it is very short-haired, but however a little more 

 conspicuously haired. Scutellum deeply inarginate, with a couple of 



Fig. 42. Antenna of O. intermedia cJ", ffom the inside. X 80. 



generally very indistinct transverse furrows. Abdomen duU black on 

 the disc, brightly shining, greenish or brassy at the sides and apex, 

 haired as in ele.gans. Legs as in geniculata with also the extreme tip 

 of the tibiæ yellow. Wings hyaline; stigma light yellow; upper mar- 

 ginal cross-vein somewhat recurrent. Squamulæ dirtily whitish with 

 a darker margin and a yellow fringe. H alteres yellow. 



Fig. 43. Wing of O. intermedia cf. 



Female. Frons and epistoma somewhat narrow, narrower than 

 in the two preceding species, in the height of the antennæ about as 

 broad as the diameter of the eye; otherwise the frons about as in 

 the two preceding species, the middle space more or less impressed 

 or even elevated, the cross-furrows not deep. Antennæ as in the 

 male. Abdomen with a small but distinct wart in the middle of the 

 hind margin of the fourth segment. Legs as in the male, hind femora 

 likewise setulose beneath. Wings as in the male, upper marginal 

 "Cross-vein recurrent in the same way. 



Length 5,5 — 6 mm. 



