LIST OF DIPTERA. 463 



the base to the tip, which is compressed, black, and shining ; hind 

 borders of the segments tawny ; under-side tinged with gray ; first 

 and second segments very short ; third and following segments long, 

 successively decreasing in length : legs red, thinly clothed with short 

 black hairs, aimed with black spines ; hips covered with dark tawny 

 down ; tips of thighs and of shanks piceous ; feet black, red at the 

 base ; foot-cushions tawny : wings colourless : wing-ribs ferrugi- 

 nous ; veins black, piceous at the base ; poisers tawny. Length of 

 the body 6^ lines ; of the wings 10 lines. 



Asilus Mucius, n. s., fern. Fuscus, thoracis vittis tribus lateri- 

 busque fulvis, pectore cano, abdomine cinereo fasciato apice 

 nigro compresso, antennis nigris, pedibus fulvis, femoribus et 

 tibiis apice tarsisque nigris, femoribus posiicis nigro vittatis, 

 alis subcinereis. 



Body brown : head full as broad as the chest, covered with 



I white down, clothed behind and more thickly beneath with white 



hairs ; crown, front, and clypeus covered with yellow down ; clypeus 



armed with a few yellowish white bristles : eyes dark bronze ; fore 



part slightly convex, its facets rather larger than those of the other 



part : lip black, clothed at the tip with short yellow hairs ; palpi 



black : feelers black; first and second joints beset with a few short 



black bristles ; second joint club-shaped, about half the length of 



1 the first ; third joint tapering from the base to the tip, rather shorter 



than the first ; bristle rather stout, much longer than the third joint; 



chest thinly clothed with very short black hairs, beset on each side 



and behind with a few white bristles, adorned with tawny sides and 



\ with three tawny stripes : middle stripe slender ; side stripes broader, 



widened in front: breast hoary: abdomen slender, brown, very 



I thinly clothed with short pale hairs, a little narrower than the 



chest, and much more than twice its length, linear till near the tip, 



I where it is compressed, black, and shining ; hind borders of the seg- 



l ments gray; first and second segments very short; third and 



| following segments long, successively decreasing in length ; under- 



i side hoary : legs tawny ; hips gray ; feet and tips of thighs and of 



shanks black ; foot-cushions dark tawny ; hind thighs streaked with 



I black : wings with a slight gray tinge ; wing-ribs ferruginous ; veins 



\ black, ferruginous towards the base ; poisers tawny. Length of the 



body 5 lines ; of the wings 8 lines. 



J a. Monte Video. Presented by C. Darwin, Esq. 



2s3 



