122 



Orthorrhapha brachycera. 



Antennæ elongated, considerably longer than the head, third joint 

 long, lanceolate, with an attenuated and pointed apex which is turned 

 a little upwards; the joint is distinctly hairy; the antennæ are black, 

 yellow beneath the basal joint. Thorax green or golden green, gener- 

 ally with a more golden middle stripe; sometimes the thorax is more 

 æneous; it is distinctly greyish pruinose, somewhat shining; scutellum 

 very finely yellow pubescent; postscutellum green, grey pruinose. 

 Pleura greenish or æneous, greyish pruinose; propleura with few, 

 short, pale hairs above, and a black prothoracic bristle. Abdoraen 

 green with golden, sometimes more coppery reflexes; it is distinctly 

 white pruinose downwards, and has very narrow, darkened hind mar- 

 gins to the segments, or these are almost wanting; it is clothed with 

 short, black hairs, at the sides with some pale hairs intermingled, and 



it has hindmarginal bristles, 

 which are a little long on 

 the first segment, and also 

 increase in length towards 

 the end. Venter greenish 

 grey, very slightly pale-haired, 

 Hypopygium black or slightly 

 æneous , greyish pruinose ; 

 eighth segment with black 

 hairs; there are long. straight, 

 almost styliform posterior 

 ventral lobes, ending with a 

 pair of small spines, they 

 issue a little more forwards than commonly; there are also a little 

 projecting middle ventral lobes, but this part of the hypopygium is a 

 little unsymmetrical; the inner lamellæ issue more ventrally than 

 commonly, they are long, the median curved a little downwards, 

 hook-shaped at the apex; the lateral are straight, a little dilated, and 

 at the apex with a dilatation which is separated ofif by an excision; 

 the outer lamellæ somewhat small, almost rectangular, white, with a 

 blackish margin only at the apex; at the end there are two longer 

 and a few shorter teeth with curved, black hairs; dorsally to the 

 teeth there are a pair of hairs, and the ventral margin has shorter 

 hairs, and on the inside some inwards curved hairs. Legs yellow, 

 front coxæ white pruinose anteriorly ; middle coxæ grey, yellow on 

 the apical part; hind coxæ mainly yellow, only greyish towards the 

 base on the outer side; front tarsi with the apex of metatarsus and 

 the foUowing four joints black, middle tarsi black, only slightly yel- 

 lowish at the extreme base; hind tibiæ black on the apical part, and 



Fig. 36. Z). acuticornis. Apical part of hypo- 

 pygium; posterior ventral lobe, lateral and 

 median inner lamellæ, and dorsal median ap- 

 pendage are seen. 



