BRITISH TEPHRITITES. 83 



poisers pale yellow. (Length of body 1± — 2 lines; oi' wings 



31— 4± lines.) 



Common in England ; on currant bushes, hazel trees, &c. 



in the summer. 



Acidia. — Desvoidy. 



Desvoidy does not include this genus with his Aciphorece, but it 

 can hardly be separated, though it is almost without their 

 peculiar characters, and much resembles some of the Sapromyzites. 



Body rather long and narrow, slightly shining ; head round ; peri- 

 stoma large, angular, not longer than broad ; epistoma scarcely 

 prominent ; mouth of moderate length ; feelers not thickened ; 

 3d joint of antennae long and cylindric, 6th joint very downy ; 

 scutellum small, shining, prominent, semicircular, hiding no part 

 of the metathorax, which is also shining; abdomen of the male 

 convex, nearly cylindric, scarcely as broad as the thorax, rather 

 narrower at the base ; abdomen of the female broader at the base, 

 narrower at the tip ; telum very short ; wings long and narrow ; 

 cross nervures straight and upright. 



Sp. 1. Acid, cognata. Tawny ; wings limpid, with taivny or 

 brown bands. (Fig. 31.) 



Trypeta cognata. Wied. Meig. Europ.Zweiflug. Ins. V. 315. 



PI. XLVIII. fig. 19. 

 Acidia cognata . Desvoidy, Essai surles Myodaires, 721. 2. 



Body tawny, clothed with a few black hairs and bristles ; head 

 almost white round the eyes, pale yellow beneath, a white curved 

 spot above the base of the antennas ; mouth yellow, clothed with 

 white hairs ; antennae yellow ; metathorax with a large black 

 spot on each side ; legs pale tawny, clothed with black hairs ; 

 wings limpid, each with an irregular pale tawny mark reaching 

 from the base to the middle, where at the upper border is a square 

 dark brown spot, beyond this a narrow tawny band darker above 

 stretches across the wing, still nearer the tip is another band of 

 the same size and shape, but brown at both ends, and from it a 

 dark brown curved band runs along the upper border of the wing, 

 and ends with the costa ; nervures and poisers yellow, tips of the 

 former darker. (Length of body 2§ lines ; of wings 5| lines.) 

 Rare in England ; found in the autumn on ivy ; near 

 London. 



Note. — The structure of the two following species is somewhat 

 different from that of cognata. 



