104 Oithonhapha biacliyceia. 



Feniales. 



1 . First joint of antennæ long, cyiindrical, nol much thicker 



Ihan the third, grey 3. italica. 



— First joint of antennæ more or less thickened, not entirely 



gi-ey 2. 



2. First joint of antennæ inoderately thickened, with an 

 annulifortn constriction at the apex 1. pluvialis. 



— First joint of antennæ more thickened, not constricted 



at the apex 2. crassicornis. 



1. H. pluvialis L. 



1761. Tabanus, Linn. Fn. suec. 403, 1887. — 1842. Zett. Dipt. Scand. 

 1, 122, 1. — 1862. Schin. F. A. 1, 39. — 1903. Kat. palåarkt. Dipt. 11, 55. 



Male. Upper eye-margin with rather long hairs, which are for 

 the most part black. Antennæ with the first joint thickened, ovale, 

 the greatest tliickness lying before the middle nearer to the base, 

 shining black. inore or less grey pruinose at the base on the inside; 

 third joint riifous to dark brown; the style black. Frontal triangle 

 grey, above the antennæ a velvet black spot. Face grey, on the 

 cheeks with black points; pubescence grey, black on the cheeks. 

 Thora.x greyish black, with five grey stripes, the inner side stripes 

 sonietimes with the hind part dissolved in two cuneiform spots; the 

 stripes sometimes very indistinct. Thorax clothed with long, brownish 

 hairs, on the pleura and sterna with yeliow hairs. Abdnnien blackish, 

 in front with an indistinct, reddish spot on each side; the dorsal 

 middle line, the hind margins of the segments, and from the third 

 or fourth segment a roundish spot on each side near the middle line, 

 brownish grey; the design sometimes indistinct. Venter grey with a 

 reddish side spot at the base. Pubescence yeliow. Legs black, greyish 

 pruinose; the posterior tibiæ with two yeliow rings, the front tibiæ 

 yeliow at the base; front tarsi black, posterior tarsi yeliow at the 

 base; femora and middle tibiæ clothed with long, partly yeliow, partly 

 black, hairs; hind tibiæ with a black ciliation. Wings greyish to 

 brownish with a reticulation of hyaline lines and spots. Halteres 

 pale, the knob brownish with pale apex. 



Female. First joint of antennæ moderately thick, distinctly con- 

 stricted annuliformly at the apex, greyish pruinose to the middle or 

 nearly to the apex; third joint yellowish to dark brown; style black. 

 Front grey with a round, velvet black spot on each side, and a small 

 one in the middle above; above the antennæ a ratlier broad, shining 

 black band, more ore less produced triangularly backwards in the 

 middle. Pubescence on thorax paler than in the male, sometimes 

 whitish grev. Abdomen as in the male, but the reddish markings 



