70 Orthoirhapha brachycera. 



Table of Species. 



1. Abdomen more Ihan twice as long as thorax, slightly wedge- 

 shaped; male forceps long, female ovipositor with the lower 

 margin straight, the upper slightly convex, the lamellæ very 

 sparingly punctate 1 , forcipula. 



— Abdomen scarcely twice as long as thorax, distinctly wedge- 

 shaped; male forceps short, female ovipositor with the lower 

 margin convex, the upper slightly concave, the lamellæ 

 densely punctate 2. trigonus. 



1. D. forcipula Zeller. 

 1840. Zeller, Isis 1840, 68 {Asilus). — 1842. Zett. Dipt. Scand. I, 

 174, 9 et nota, et 1855. XII, 4576, 9, et 1859. XIII, 4963, 9 {Asilus). — 

 1848. Low, Linn. Entom. III, 4.38,7 {Loj)honotus). — 1862. Schin. F. A. I, 

 147 (Asilus). — 1903. Kat. palåarkt. Dipt. II, 148. — ? 1830. Asilus Do- 

 mitor Meig. Syst. Beschr. VI, 334, 63. 



Male. Eyes in the living specimens greenish, slightly metallic. 

 Face brownish yellow pruinose; epistomal beard black above and at 

 the sides, yellow in the niiddle and below. Palpi black with yellow 

 hairs. Frons and vertex brown with long, black hairs. Occiput 

 brownish yellow pruinose; occipito-orbital bristles black; the hairs 

 yellowish. Antennæ black, the two first joints with black hairs, the 

 hairs below the first joint long. Thorax yellowish brown, the middle 

 stripe blackish brown, broad in front, narrowed behind and pointed ; 

 it has a dividing line generally very indistinct; the side stripes not 

 large, the space between them and the niiddle stripe rather broad 

 with a more or less indistinct, brown stripe, most distinct in front. 

 Thorax clothed with long, black hairs which only are shorter in front; 

 the bristles black, those at the sides yellow. Scutellum with yellow 

 hairs and yellow and black marginal bristles. Pleura brownish pruinose 

 with some long, yellowish hairs; the long hairs on meta- and hypo- 

 pleura yellow, Abdomen dark greyish brown with a slight indication 

 of a middle line; with the light from behind it is darker and slightly 

 shining, with grey hind margins of the segments which are widened 

 at the hind corners. Venter grey. Abdomen clothed with short hairs 

 which are black along the middle, for the rest yellow; at the hind 

 margins of the segments there are long, yellow bristles which are 

 wanting along the middle. Venter sparingly clothed with long, whitish, 

 somewhat strong hairs, the eighth segment has a dense fringe of black 

 hairs at the hind margin. The genitalia black, shining, black haired, 

 at the lower side of the upper forceps there are generally some yellow 

 hairs; the dorsal median lamella with ferrugineous hairs; the ventral 

 lamella black. shining. The forceps long, the arms curved evenly 

 downwards, with a slight and shallow excision above at the apex. 



