Ghrysogaster. 115 



the sides, but from the middle of the spot a curved, finely striated 

 space curves down to each side, tiiese spaces togetiier with the middle 

 of tiie dusted spot loolcing as a grey, bow-shaped part. Vertex and 

 frons witii long, black hairs; epistoraa with pale hairs at the sides 

 above. Occiput blaclc, a httle pruinose, with black hairs ; quite below 

 and on the jowls the hairs white. Eyes with the large and small facets 

 distinctly contrasted and the division across the eyes rather distinct. 

 Eye-margins very narrow. Antennæ small, black, third joint roundish, 

 second joint with only small hairs below; arista much longer than 

 the antennæ. Thorax black, slightly æneous, duUish in front, shining 

 behind, finely not densely punctate; anteriorly it has three somewhat 

 distinct duU black stripes, the median most distinct, the lateral ab- 

 breviated and quite short. Thorax is clothed with longish, fme and 

 not dense, brownish or black hairs. Pleura with black hairs. Abdomen 

 duU velvet black on the disc, shining and a little æneous at sides and 

 apex; it is sparingly clothed with fme hairs which are partly dark, 

 but quite short and inconspicuous on the disc, a little longer and pale 

 at the sides and here somewhat long at the basal corners. Venter 

 black or a little æneous, shining, sparingly clothed with short, pale 

 hairs. Genitalia somewhat large. Legs black, haired as usual; the 

 hairs mainly black on the anterior femora and on tibiæ, but here 

 quite inconspicuous; hind femora black setulose below. Hind tibiæ 

 rather distinctly curved, hind metatarsus a little thickened. Wings a 

 little tinged; stigma brownish yellow, below it generally an undefined 

 brownish cloud, sometimes the wings almost hyaline; middle cross- 

 vein generally a little thickened. Plumula blackish. Squamulæ dirtily 

 whitish, with a dark margin and a pale fringe. Balteres blackish or 

 blackish brown. 



Female. Frons very broad, relatively broader than in Macquarti-, 

 it has a distinct longitudinal channel and vague, irregular cross-furrows ; 

 the bow-shaped impression above the antennæ distinct and below it 

 a dot-like groove. Epistoma without central knob. Mouth edge a 

 little more produced than in Macquarti; frons very short-haired, 

 epistoma almost bare. Antennæ a little larger than in the male. 

 Thorax æneous black, shining, sparingly punctate and with very short, 

 mainly dark hairs so that it may look almost bare. Abdomen like- 

 wise æneous black and shining, on the disc more black or bluish black 

 but not dull ; it is sparingly punctate and haired, the hairs quite short, 

 yellowish, but dark on the middle. Wings generally with the cloud 

 stronger than in the male, and also often with the base darkened. 



Length 5,5 to fully 6 mm. 



This species is easily distinguished from Macquarti, in the male 



