246 Orthorrhapha brachycera. 



bristles; further a notopleural and a supraalar bristle present. Scutel- 

 lum with two marginal bristles. Metapleura with a few bristles. ^ 

 Abdomen consists of eight segments. The exterior male genitalia are 

 large, they resemble somewhat the genitalia in Hilara; the seventh 

 and eighth abdominal segments are lower than the preceding and 

 covered by the genitalia; these latter consist of a large, strongly com- 

 pressed piece, which above and in front has a pair of lamellæ with 

 hooks; perhaps the lower piece answers to the ventral lamella. In the 

 female the abdomen is pointed towards the apex and terminates with 

 a thin ovipositor formed of two small, slightly downwards curved 

 styliform lamellæ. Legs thin and slender; the front coxæ elongated, 

 more than half as long as the femora; the front femora thickened in 

 both sexes, with two rows of strong bristles below, and besides with 

 rows of very small, tubercle-shaped spines; the front tibiæ are a httle 

 curved and can be laid up towards the femora between the rows of 

 the bristles; the front legs are thus raptorial as in Hemerodromia. 

 For the rest the legs are short-haired ; tibiæ without apical spurs. 

 There are two claws, two small pulvilli and a small, linear empodium 



Fig. 109. Wing of Ch. melanocephala. 



with bristles at the margin. Wings with the subcostal vein short; the 

 cubital vein unforked, thus one cubital cell; the discai vein forked 

 and thus four posterior cells; no discai cell; the lower branch of the 

 postical vein going straightly downwards; the second basal cell a 

 little shorter than the first, the anal cell as long as the second basal 

 cell; anal vein not reaching the margin. No stigma. Axillary lobe 

 not developed. No alula, the wing-margin here only short fringed. 

 Alar squamula very narrow, with some long hairs at the margin. 



The developmental stages are not known. 



The small and delicate species occurs especially in woods on 

 shaded and humid piaces. / 



The genus comprises only one species, also occurring in Denmark. 



^ Girschner says (111. Zeitschr. fiir Entoin. 1897, 557) that of the Hemerodromiinae 

 only CUnocera has hairs on the metapleura, but both the present and the fol- 

 lowing genus have distiiict metapleural bristles. 



