460 LIST OF DIPTERA. 



black ; tips of shanks piceous ; feet black, tawny at the base ; foot- 

 cushions piceous : wings colourless ; wing-ribs piceous ; veins black ; 

 poisers pale tawny. Length of the body 6\ lines ; of the wings 8 

 lines. 



Asilus Thimbro, n. s., mas. et fern. Fulvus, thoracis vittis quatuor 

 obscurioribus, later ibus pectoreque canis, abdominis segmentorum 

 marginibus posticis cinereo-fulvis, antennis fulvis apice piceis, 

 pedibus fulvis, alis limpidis, apicibus marginibusque posticis 

 cinereis. 



Male. — Head as broad as the chest, covered with white down, 

 clothed behind and beneath with white hairs ; crown covered with 

 tawny down, beset on each side with a few black hairs ; front 

 and clypeus covered with pale yellow hairs ; clypeus armed with 

 long pale yellow bristles : eyes dark reddish bronze ; fore part flat, 

 its facets much larger than those of the other part: lip black, 

 clothed at the tip with short tawny hairs ; palpi red, beset with long 

 tawny hairs : feelers tawny ; first and second joints beset with short 

 black bristles ; second joint about half the length of the first ; third 

 joint piceous, spindle-shaped, tawny at the base, as long as the first 

 joint: bristle black, rather stout, much longer than the third joint : 

 chest light tawny, clothed with short black hairs, beset on each side 

 and behind with black bristles, adorned with four darker tawny 

 stripes ; middle stripes narrow, linear ; side stripes shorter, broader, 

 and irregular : breast and sides of the chest hoary : abdomen nearly 

 linear and cylindrical, very much narrower than the chest, and more 

 than twice its length, clothed with short pale yellow hairs, and to- 

 wards the base with longer hairs ; first and second segments very 

 short ; second segment arched ; third and following segments long, 

 successively decreasing in length to the tip, which is shining ; hind 

 borders of the segments grayish tawny, armed on each side with 

 long black and white bristles ; sexual parts large, piceous, shining i 

 legs tawny, clothed with short black hairs, armed with long black 

 spines ; claws black, tawny at the base ; foot-cushions tawny : wings 

 colourless, gray at the tips and along the hind borders ; wing-ribs 

 tawny ; veins black, tawny at the base ; poisers tawny. Female. — 

 Abdomen about thrice the length of the chest ; its tip black, shin- 

 ing, and compressed. Length of the body 7 — 8 lines ; of the wings 

 11— 12 lines. 



