360 Tachinidae. 



Kat. palåarkt. Dipt. III, 305. — 1924. Stein. Arch. f. Naturgesch. 90, 6, 104 

 (Frivaldzkia). — Frivaldzkia longicornis 1862. Schin. (nec. Fall.) F. A. I, 527. 

 — 1889. B. B. Denkschr. Akad. Wiss. Wien, LVI, 93, Tab. II, Fig. 39 {Hypo- 

 chaeta). — 1907. Villen. 1. c. XXVI, 249, 8. — Zenillia alnicola Pand. 1894. 

 Rev. Entom. XIV, 346, 23. — 1907. Villen. Ann. Soc. Ent. de Fr. LXXVI, 384. 



Male. Frons above as broad as the eye, somewhat protruding, 

 eye-margins nearly parallel or slightly diverging downwards; orbits 

 and cheeks narrow; jowls broad, nearly half as broad as the height 

 of the eye. Orbits greyish, cheeks silvery; jowls grey; frontal stripe 

 greyish or yellowish priiinose. Ocellar bristles erect and directed 

 outwards and a little backwards. Vibrissæ strong and distant, only 

 a few upper smaller. Orbits with a row of black hairs; jowls white- 

 haired, with one or sometimes two black bristles exterior to the oral 

 bristles at the upper margin of the jowl. Occiput grey, with white 

 hairs, and a row of black hairs behind postocular bristles. Eyes with 

 long pale hairs. Antennæ black, third joint five or six times as long 

 as second; arista thickened in a little more than basal third. Palpi 

 thin, yellow. Thorax greyish brown or blackish, grey pruinose, with 

 four darker stripes, the median narrow, abbreviated behind, the 

 lateral broader; scutellum a little elongated, longer than or as long 

 as broad, dark. Thorax black-haired; generally three præ- and two 

 postsutural acrostichals; a præsiitiiral intraalar bristle. Abdomen 

 black, shining, the three last segments with a narrow greyish pruinose 

 front band, more or less excised in the middle. Abdomen black- 

 haired; second segment without bristles, third with a pair of discai 

 and marginal, fourth with a pair of discai and a row of marginal, 

 and fifth with a row of discai and of marginal bristles. Genitalia 

 bent in under venter; upper forceps triangularly spine-shaped, pointed, 

 with apex curved inwards, it is hairy except apex with longish, back- 

 wards directed hairs; arms of lower forceps triangular, more obtuse 

 and a little shorter. Legs black; tarsi with the basal joints a little 

 compressed. Wings somewhat brownish tinged; veins blackish brown; 

 apical cross- vein straight; posterior cross- vein nearer the medial 

 cross- vein than the angle; the two or three bristles at base of cubital 

 vein rather strong. Squamulæ dirty whitish or yellowish. Halteres 

 yellow. 



Female. Similar; frons of the same breadth; jowls partly black- 

 haired; no outer vertical bristles. The pruinose bands on abdomen 

 generally broader. 



Length 5 — 6 mm. 



