Ghrysogaster, 



107 



with White hairs. Occiput greenish, grey pruinose with white hairs. 

 Antennæ not specially long, third joint elongated, somewiiat pointed, 

 scarcely twice as long as broad ; arista about as long as the antennæ ; 

 the antennæ black or brownish black, third joint pale beneath especi- 

 ally towards the base ; the second joint has long, white bristles beneath. 



Fig. 46. Antenna of O. nobilis c?, from the inside. X 80. 



Thorax metallic green or brassy, very densely punctate, slightly shining; 

 it has four slight more brass-coloured or brownish stripes, the two 

 median abbreviated behind ; it is clothed with very short, pale brown 

 hairs. Pleura metallic green, densely punctate, with longer, pale hairs. 

 Abdomen bliiish black and dull on the disc, metallic green, shining at 

 the sides and apex; it is clothed with short hairs which are pale at 

 the sides, dark and still shorter on the dull part; the hairs are longer 



Fig. 47. Wing of O. nobilis cf. 



at the sides of the first segment and still longer at the basal corners 

 of second. Genitalia rather large. Venter metallic green with pale 

 hairs. Legs unicolorous, metallic green, tarsi black; the hairs short and 

 pale, hind femora a little setulose beneath ; hind tibiæ somewhat curved 

 and a little compressed towards both ends and hind metatarsus slightly 



