Exorista. 313 



Hansen) and at Hald (A. Petersen); the dates are in August. The 

 species is recorded parasitic on Aporia crataegi^ Thecla ilicis, Zephyrus 

 quercus, Callophrys rubi, Tephroclystia sp. and the non Danish Rhy- 

 paria purpurata. 



Geographicai distribution: — Europe and down into Africa 

 (Villeneuve, Rev. Zool. Afric. III, 1913, 32); towards the north to 

 middle Scandinavia, and in Finland. It also occurs in North America. 



4. E. affinis Fall. 



1810. Fall. Vet. Acad. Handl. XXXI, 260 et 1820. Dipt. Suec. Muse. 

 28, 57 {Tachina). — 1824. Meig. Syst. Beschr. IV, 327, 153 et 1830, VI, 368 

 (Tachina) et 1838. VII, 255, 5, Tab. LXXII, Fig. 17—21. — 1844. Zett. Dipt. 

 Scand. III, 1106, 103 et 1859. XIII, 6101, 103 (Tachina). — 1862. Schin. F. A. I. 

 465. — 1891. B. B. Denkschr. Akad. Wiss. Wien, LVIII, 320 {Parexorista). — 

 1896. Pand. Eev. Entom. XV, 25, 38. — 1907. Kat. palåarkt. Dipt. III, 239. 

 — 1921. Baer, Zeitschr. f. angew. Ent. VII, 147. — 1924. Stein, Arch. f. Natur- 

 gesch. 90, 6, 72, 3. — E. polychaeta Macq. 1849. Ann. Soc. Ent. de Fr. 2, VII, 

 380, 31, Tab. XI, fig. 10. — 1859. Rond. Dipt. Ital. Prodr. III, 125, 3. — 

 1862. Schin. F. A. I, 463. — 1891. B. B. p. p. 1. c. LVIII, 320 (Parexorista). — 

 Parexorista latifrons B. B. p. p. 1891. 1. c. LVIII, 321 et 327. — 1907. Villen. 

 Wien. Ent. Zeitg. XXVI, 251. — Myxexorista flavipalpis B. B. 1891. 1. c. 

 LVIII, 332. — 1907. Villen. 1. c. XXVI, 250. — 1907. Kat. palåarkt. Dipt. 

 III, 278 (Zenillia). 



Male. Frons above about one third of the breadth of the eye, 

 slightly protruding; orbits somewhat broader than the frontal stripe; 

 cheeks much narrowing downwards. Orbits black above, downwards 

 together with cheeks silvery, but reflecting dark in certain views; 

 jowls rather narrow, greyish black, intermediate triangle reddish; 

 frontal stripe velvet black. Frontal bristles numerous, descending 

 to or below insertion of arista and to middle of cheeks or below; 

 they are somewhat irregular below; three upper strong and reclinate. 

 Vibrissæ slightly ascending. Orbits and jowls black-haired. Occiput 

 dark grey, with yellowdsh hairs and no black hairs behind postocular 

 bristles, at all events not above. Eyes with pale hairs. Antennæ black, 

 third joint about twice as long as second; arista thickened in about 

 basal third, second joint distinct but only slightly elongated. Palpi 

 yellow, dark at base. Thorax black, somewhat shining, a little bluish 

 pruinose anteriorly and especially at the sides; there are four not 

 very distinct, equally broad dark stripes, evanescent behind; scu- 

 tellum brownish red, black at base. Thorax with short black hairs; 

 three postsutural dorsocentrals, (or four: var. polychaeta Macq,). 

 Scutellum with four marginal bristles on each side, the apical crossing. 



