364 LIST OF DIPTERA. 



its fore part chiefly occupied by the eyes, which are large and pro- 

 minent ; in their inner region the facets decrease regularly in size 

 from the border of the crown outwards, but the facets of the outer 

 part are all extremely small, and of equal size : feelers and mouth 

 black : chest, breast, and abdomen hoary, thinly clothed with white 

 hairs : chest with three brown stripes ; middle stripe broad, linear, 

 extending from near the fore border to a little beyond the middle of 

 the length ; side stripes but little more than half the length of the 

 middle stripe, being shortened in front where their borders are 

 straight, but their hind borders are convex ; scutcheon prominent : 

 abdomen narrower than the chest, and less than twice its length : 

 legs stout, tawny, clothed with black hairs and bristles ; hips hoary ; 

 thighs towards the base, knees, feet, and tips of the shanks black ; 

 hind thighs thick, each armed beneath with nine black spines ; hind 

 shanks slightly curved ; hind feet not wide : wings white ; wing 

 ribs and veins pale yellow, the latter tawny towards the tips of the 

 fore borders ; poisers tawny. Length of the body 4^- lines ; of the 

 wings 8 lines. 



a. North Bengal. From Miss Campbell's collection. 



Group XXIII. 



Dasypogon transiens, n. s. Niger, pilis nigris vestitus, thorace vit- 

 tis tribus cinereis, abdomine pilis ferrugineis vestito, antennis 

 pedibusque nigris, alis fuscis. 



Resembles a Laphria ; and some of the species of Dasypogon, 

 Laphria and Asilus form parallel series, like those of Empis and 

 Rhamphomyia. Body black, thickly clothed with black hairs : head 

 a little narrower than the chest : tubercle of the eyelets beset with 

 a tuft of black bristles ; front covered with silky brown down ; cly- 

 peus thickly armed with long black bristles : eyes black ; fore part 

 flat, composed of large facets, its border quite distinct and not 

 blending with the facets of the other part : lip short, stout, deep 

 black, its tip clothed with short tawny hairs : feelers black ; first 

 and second joints beset with black hairs and bristles ; second joint 

 a little longer than the first ; third joint nearly linear or slightly ta- 

 pering from the middle to each end, clothed above with short black 

 hairs, more than twice the length of the first and of the second 

 joints : chest with three indistinct very dark gray stripes ; middle 

 stripe long and linear ; side stripes short and oblique : abdomen 

 nearly linear, convex, thickly clothed with ferruginous hairs, armed 

 at the tip with short black spines, a little narrower than the chest 

 and nearly twice its length : legs stout, black, thickly clothed with 



