104 Tachinidae. 



and more so than in male. Epistoma not retreating, but reflected 

 and rather protruding in the lower half. Palpi thread-like. Antennæ 

 inserted above the middle of the eye, short, only reaching to the 

 middle of epistoma; they are a httle distant at base; third joint 

 shghtly longer than second; arista thickened at base, short-pubescent, 

 second joint distinct, but not elongated. Thorax quadratic; three 

 postsutural dorsocentrals, the anterior small, sometimes wanting, 

 and only præscutellar acrostichals. Scutellum with three marginal 

 bristles on each side. Two (or three) sternopleural bristles. Ptero- 

 pleura with a bundle of hairs above. Abdomen ovate; excavation 

 on second segment somewhat large, but not reaching the hind margin; 

 a narrow sixth segment visible anterior to the præhypopygial; only 

 small marginal bristles present, on second segment a pair. Male 

 genitalia bent in under venter; in female only simple retractile seg- 

 ments present at end. Legs medium long, hind tibiæ a little narrow 

 at base and then a little dilated; ventral bristle on middle tibiæ 

 wanting in male, present in female; claws and pulvilli in male strongly 

 elongated, in female shorter but not small. Wings with first posterior 

 cell narrowly open or just closed at margin, ending quile near apex 

 of wing; angle on discai vein very obtuse and rounded. No costal 

 spine, and no bristles at base of cubital vein. 



Of the genus about 5 European species are recorded, one occurring 

 in Denmark. 



1. X. cana Meig. 



1824. Meig. Syst. Beschr. IV, 201, 30 {Phasia) et 1838. VII, 282, 3. — 

 1862. Schin. F. A. I, 407. — 1891. B. B. Denkschr. Akad. Wiss. Wien LVIII, 

 388. — 1900. Stein, Ent. Nachricht. XXVI, 133. ^ 1907. Kat. palåarkt. Dipt. 

 III, 569. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 255, 1. — Phasia Rothi 

 Zett. 1859. Dipt. Scand. XIII, 6170, 16. — 1894. Pand. Eev. Entom. XIII, 

 94, 4. — 1907. Villen. Ann. Soc. Ent. de Fr. LXXVI, 380. — Xysta semicana 

 Egg. 1860. Verh. zool. bot. Gesell. Wien, X, 797. — 1862. Schin. F. A. I, 407 c^. 

 — 1891. B. B. 1. c. LVIII, 388. ^ 1907. Kat. palåarkt. Dipt. III, 569. 



Male. Frons above very narrow with the orbits nearly touching, 

 a little protruding; cheeks not narrow and jowls rather broad, but 

 somewhat horizontal and tlius not much descending. Orbits black 

 just above, below together with the cheeks silvery, shifting to dark; 

 jowls grey. Frontal stripe black or dark brownish. Frontal bristles 

 stopping above before vertex. Orbits bare, jowls with brownish to 

 blackish hairs. Occiput grey with yellowish hairs below, black above. 



