208 Orthorrhapha brachycera. 



which often may be seen below; the penis is long and so strongly 

 curved that, when stretched quite out, it may be seen below the 

 hypopygium, stretching baci^wards. In the female the abdomen has 

 as usual five normal, visible, and three hidden segments, and it ter- 

 minates with a number of small spines. The usual dot-like impres- 

 sions are present on the second, third and fourth segment, and also 

 somewhat visible on the fifth, at all events in the male. The ab- 

 dominal segments have short hindmarginal bristles. Legs not long 

 and somewhat robust; hind metatarsus a little longer than the second 

 joint. The legs have short hairs; the coxæ have small, bristly hairs 

 at the apex, the middle coxæ a longer bristle anteriorly at the outer 

 edge, and the hind coxæ a bristle on the outer side; femora with 

 small or more bristly hairs below on the posterior side of the front 

 femora, on both sides of the middle femora and on the anterior side 

 of the hind femora; sometimes they are present on both sides of all 

 femora; they are always strongest and bristly at the apex, but there 

 are otherwise no preapical bristles. Front tibiæ with two, one or no 

 bristles above; middle tibiæ generally with two strong antero-dorsal 

 bristles, and one to three small postero-dorsal; sometimes there is 

 only one antero-dorsal or none at all; below there are no bristles; 

 hind tibiæ with two dorsal rows of bristles, and in the males besides 

 with a shorter or longer ciliation on the antero-dorsal and anterior 

 side, continued more or less out on the tarsi; hind metatarsi without 

 bristles. There are two small claws and pulvilli, and a narrow em- 

 podium with bristles below. Wings of usual shape; the mediastinal 

 vein terminating in the subcostal vein; discai vein with a very small 

 curve after the cross-vein, but for the rest parallel with the cubital 

 vein; the posterior cross-vein in the middle or nearer the base; anal 

 vein not reaching the margin. Axillary lobe moderately developed. 

 The discai vein has the curve lying on a convexity. The wings are 

 in rest borne somewhat open, at all events generally. Squamulæ 

 small, the angulary lobe distinctly developed, with a fan of rather 

 long hairs; the inner part of the squamulæ short-haired. 



The developmental stages of the genus are not known, as far as 

 I am aware. 



The species of Chrysotus are rather lively flies, and they are 

 in nature easily known from most other Dolichopodids by their 

 somewhat short shape and the, in rest, half open wings. Their walking 

 occurs, as Kowarz states, somewhat at intervals, and they fly only 

 short distances at a time. They occur on bushes, leaves and in low 

 herbage and grass on more or less humid piaces as in fens and on 

 meadows, especially at or in woods, and also near water, sometimes 



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