Asilidae. 23 



4. D. rufipes De Geer. 



1776. De Geer, Ins. VI, 97, 6, Tab. XIV, Fig. 2. (Asilus) — 1842. 

 Zett. Dipt. Scand. I, 183, 2, et 1849, VIII, 2972, 2, et 1855, XII, 4580, 2. 

 — 1847. Low, Linn. Entom. II, 425, 9. — 1862. Schin. F. A. I, 121. — 

 1903. Kat. palåarkt. Dipt. II, 107. 



Male. Eyes in the living specimens greenish, slightly metallic. 

 Face brassy to whitish pminose, shining black just below the antennæ; 

 epistomal beard yellowish. Proboscis and palpi black with yellow 

 hairs. Antennal tubercle highly prominent; frons and vertex black; 

 occiput black with dark yellow hairs which are paler downwards, it is 

 yellow pruinose along the posterior eye-margin when seen in certain 

 directions. Antennæ black, the two first joints with black hairs; the 

 first joint twice as long as the second, the third slightly shorter than 

 the two first together. Thorax black, somewhat shining, with three 

 not very distinct narrow, yellow hairy stripes 

 uniting posteriorly and confluent with the yellow 

 pubescence on the disc; the median stripe most 

 narrow and not rarely quite indistinct. Præsu- 

 tural and supraalar bristles brownish or yellow. 

 Pleura black, shining, the hairy stripes fully 

 developed, yellowish togreyish; longer yellowish 

 or greyish hairs are found above the front coxæ 

 and at the hind margin of the mesopleura; the 

 long hairs on metapleura yellow. Scutellum 

 rugose with somewhat longish, yellow^ pube- 

 scence. Abdomen black with short, yellowish 

 pubescence, which is slightly longer on the venter; 

 at the lateral margins of the first segment there ^'^■^- "^^'^ of D. ru fip.s. 

 are longer hairs; genitalia with longish, yellowish hairs, especially 

 beneath. Legs with the coxæ black, greyish or whitish pruinose on 

 the outer side and with long, whitish hairs; anterior legs ferrugineous, 

 the outermost apex of the tibiæ and the tarsi except the base of the 

 metatarsus blackish brown; often a small black patch at the apex of 

 the femora on the upper side; hind legs black, the base and apex of 

 the femora and the base of the tibiæ very narrowly ferrugineous. The 

 apex of the hind tibiæ only slightly thickened, and the hind metatarsi 

 not thickened, only very slightly broader than the second joint. 

 Pubescence on the legs yellowish, the fringe on the hind femora 

 whitish, that on the tibiæ whitish brown; the usual long, thin hairs 

 present; the stronger, spine-like bristles brownish or yellow, those on 

 the hind tibiæ sometimes black; they are very small on the anterior 



