342 LIST OF DIPTERA. 



stripes narrow, long and linear ; the outer stripes short, broad, and 

 not extending over the fore part of the chest ; scutcheon tawny : 

 abdomen ferruginous, dull, very finely punctured, clothed with short 

 black hairs, and towards the tip with longer tawny hairs, somewhat 

 narrower than the chest and about twice its length ; base and last 

 three segments more or less piceous on the back ; first and second 

 segments short, beset on each side with black bristles ; third segment 

 long, with a cross impression before the middle ; fourth and following 

 segments successively decreasing in length to the tip : legs ferrugi- 

 nous, rather thickly clothed with short tawny hairs ; hips black ; shanks 

 having verv few black spines, but these are more frequent on the 

 feet, especially towards the tips of the joints ; claws black ; foot- 

 cushions pale yellow; fore legs armed with a long curved black 

 tooth at the tip of the shank, and with a short blunt tawny foot at 

 the base of the foot : wings tawny, with a brown tinge at the base 

 and along the fore border for about half the length ; wing-ribs and 

 veins ferruginous ; poisers tawny. Length of the body 9 lines ; of 

 the wings 16 lines. 



Group XI. 



Dasypogon Libo, n. s. Canus, thoracis disco fusco vittis tribus pal- 

 lidioribus, abdomine rufo -fusco basi apiceque pallidioribus, an- 

 tennis pedibusque nigris, alis subfuscis fusco subvittatis. 



Body dull : head hardly as broad as the chest, covered with 

 thick shining yellowish white down, clothed behind and beneath 

 with yellow hairs, and having a few black hairs on the crown and on 

 the tubercle of the eyelets : rims of the eyes beset with black bris- 

 tles : clypeus armed with eight long pale yellow bristles, and also 

 beset with some tawny hairs and long black bristles : lip black, a 

 little longer than the head, clothed with very few long yellow hairs, 

 and having a group of short yellow hairs at the tip ; tongue ferru- 

 ginous ; maxillae and labrum tawny : eyes black, with a very slight 

 purplish tint ; fore part, its facets large, but decreasing in size as 

 they diverge towards the convex part, not however so as to blend 

 with the latter, which has extremely small facets : feelers black, a 

 little longer than the head ; first and second joints of equal length, 

 beset with black bristles ; third joint long club-shaped, nearly as 

 long as the first and the second joints, but much more slender: fore 

 chest distinct, with a cross furrow : chest and breast hoary ; disk of 

 the chest dark brown, with three narrow indistinct pale stripes ; sides 

 beset with black bristles ; breast clothed with long yellowish white 



