Petina. 537 



Lapp. 653, 3 (Musca) et 1844. Dipt. Scand. III, 1271, 8 (Dexia). — 1862. 

 Schin. F. A. I, 555 {Melania). — 1889. B. B. Denkschr. Akad. Wiss. Wien,, 

 LVI, 129, Tab. VIII, Fig. 219 (Melanota). — 1896. Pand. Kev. Entom. XV, 

 145, 8 {M elanophor a). — 1907. Kat. palåarkt. Dipt. III, 434. — 1924. Stein, 

 Arch. f. Naturgesch. 90, 6, 154. — Musca cylindrica Fall. 1816. Vet. Acad. 

 Handl. 242, 23 et 1821. Dipt. Suec. Muse. 43, 13. — Dexia bifasciata Meig. 

 1826. 1. c. V, 35, 1 et 1838. VII, 275, 4 {Melania). — 1862. Schin. F. A. I, 555 

 (Melania). — T. procera Meig. 1824. 1. c. 410, 297 et 1838. VII, 239, 1, Tab. 

 LXXI, Fig. 1—5 (Hyfostena). — 1900. Stein, Ent. Nachricht. XXVI, 147. 



Male. Frons about as broad as the eye. Head silvery, orbits 

 more greyish above. Frontal stripe velvet black. Orbits and cheeks 

 with fine black hairs; jowls bare for the most part. Occiput blackish 

 grey, with yellow hairs below, black above. Antennæ black; arista 

 thickened in basal part, short-plumose. Palpi black. Thorax black^ 

 shining, whitish pruinose at humeri and sides stretching inwards 

 at the suture; it is sparingly black-haired. Abdomen black, shining^ 

 third and fourth segment with a silvery pruinose front band, inter- 

 rupted in the middle. Abdomen black-haired, with a pair of discai 

 and a row of marginal bristles on all segments, the bristles long. Legs 

 black. Wings brownish, most at anterior margin; veins brown. Squa- 

 mulæ and balteres yellow. 



Female. Quite similar, with frons of the same breadth. 



Length 6,5 to fully 8 mm. 



P. volvulus is not just common in Denmark; Egebæks Vang^ 

 Jyderup, Sorø; on Lolland at Nysted and Saxkøbing; on Falster at 

 Nykøbing, and in Jutland at Toftlund, Gram and Hald; the dates 

 are ^/g — ^^/g. The species occurs in low herbagé and on umbellifers. 



Geographical distribution: — Europe; towards the north to 

 northern Scandinavia, and in Finland. 



133. Petina Meig. 



(Peteina.) 



Species of medium size, somewhat slender, all black, without or 

 with slight pruinosity. Head a little broader than thorax, somewhat 

 long, nearly as long as high, convex behind and here considerably pufTed 

 out, especially below. Epistoma very retreating, so that the head is 

 somewhat triangular in profile. Frons broad and about equal in both 

 sexes, very protruding. Cheeks somewhat broad, and jowls about 

 one third of the height of the eye. In both sexes ocellar, inner vertical 



