222 Orthorrhapha brachycera. 



bristles in the dorsocentral rows. Scutellum with two bristles and 

 some small hairs. All femora with a pair of præapical bristles. 



One Danish species 4. Zetterstedti. 



4. Cl. Zetterstedti Fall. 



1823. Fall. Dipt. Suec. Suppl. I, 7, 36—37 (Empis). — 1842. Zett 

 Dipt. Scand. I, 362, 4 (Brachystoma). — 1858. Loew, Wien. entom. Monatschr. 

 II, 249, 6. - 1862. Schin. F. A. I, 84. — 1881. Mik, Verhandl. zool. bot. 

 Gesell. Wien, XXXI, Tab. XVI, Fig. 11. — 1903. Kat. palåarkt. Dipt. II, 266. 



Male. Vertex, frons and epistoma brownish ; palpi black. Occiput 

 grey, with black, bristly hairs above, long, whitish hairs below. Antennæ 

 black. Thorax dark olive-brown, unicolorous, at most with traces of 

 a pair of longitudinal stripes. The disc has five long, black dorso- 

 central bristles in each row, and very short and thin, biserial acro- 

 stichal bristles. Further a humeral bristle, a posthumeral, two noto- 

 pleural and a postalar bristle, all long, black; there is no supraalar 

 bristle; besides there are small hairs anteriorly in the præsutural de- 

 pression. Scutellum has two black marginal bristles, and some small 

 hairs. Pleura brownish grey, metapleura with short, whitish hairs. 

 Abdomen olive-brown above, bluish grey along the sides; it is clothed 

 with short, blackish hairs. Venter grey or bluish grey, with whitish 

 yellow hairs. The exterior genitalia directed forwards, the outer 

 (lower) lamellæ rounded at the end, the inner (upper) lamellæ longer, 

 drawn out into two small, rounded processes at the end, beset with 

 longish hairs, the lower lamellæ likewise with somewhat long hairs. 

 Penis brown, thread-like, sinuous at the apex. Legs black or blackish ; 

 coxæ greyish brown pruinose, and also the base of the femora more 

 or less greyish. The legs are short-haired with brownish to blackish 

 hairs, the front femora with a little longer hairs below towards the 

 base; all femora with two subapical black bristles, one on the anterior 



Fig. 92. Wing of Cl. Zetterstedti. 



and one on the posterior side; hind tibiæ with longish, bristly hairs 

 above and below in the apical half part, longest below. Wings 

 blackish tinged. Veins black. Stigma blackish brown; costa with 



