310 LIST OF DIPTERA. 



crown thinly covered with tawny hairs : front and clypeus adorned 

 with yellowish white down, the former clothed on each side with 

 yellowish white hairs, the latter very thickly beset with yellow bris- 

 tles ; hypostoma ferruginous: eyes black, rather large; fore part 

 flat, distinct from the other part and with much larger facets : lip 

 black, rather long, thickly clothed at the tip with pale tawny hairs ; 

 palpi bright tawny, thickly beset with tawny hairs and bristles ; first 

 and second joints of the feelers ferruginous with piceous tips, of 

 nearly equal length, clothed with tawny hairs and bristles : chest 

 tawny, clothed with short tawny hairs and beset on each side and 

 behind with tawny bristles, adorned with four piceous stripes, of 

 which the inner pair are slender and the outer pair are broad ; sides 

 and breast paler, covered with a hoary bloom and clothed with white 

 hairs : abdomen tapering from the base to the tip, narrower than 

 the chest and more than twice its length, black above, ferruginous 

 beneath and on the sides of the segments above from the middle to 

 the hind borders, clothed with short tawny hairs, sometimes piceous 

 and covered with a dark tawny or hoary bloom ; segments dotted 

 with cross rows of little black punctures ; first and second segments 

 short ; third and following segments long, successively but slightly 

 decreasing in length to the tip, which is armed with a circlet of 

 short black spines : legs ferruginous, clothed with short pale yellow 

 or white hairs, and armed with pale yellow spines ; hips black, 

 clothed with long white hairs ; thighs black above ; hind shanks 

 black at the tips ; tips of the feet blackish ; claws black, ferruginous 

 at the base ; foot-cushions yellow or tawny : wings very light brown, 

 colourless at the base, reaching when closed nearly to three-fourths 

 of the length or to the last segment of the abdomen ; wing-ribs and 

 veins piceous, the latter black at the tips ; poisers tawny, their knobs 

 mostly piceous. Length of the body 12 lines ; of the wings 16 lines. 



Var. j3. Abdomen piceous, covered with a dark tawny bloom ; 

 sides and under-side covered with a hoary bloom ; hind borders of 

 the segments of the under-side ferruginous, and this hue becomes 

 more prevalent towards the tip and occupies the whole of the last 

 segment. 



a. South Africa. Presented by Dr. A. Smith. 



Dasypogon venosus, Wied. Dipt. Exot. i. 215, 1. Auss. Ziveif. i. 

 367, 1. Microstylum venosum, Macq. Dipt. Exot. i. 2, 27, 1. 

 a. South Africa. Presented by Dr. A. Smith. 



