422 LIST OF DIPTERA. 



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

 black, beset with long black hairs; first and second joints of 

 the feelers black, beset with short black bristles; second joint not 

 half the length of the first : fore chest beset with pale yellow hairs 

 and black bristles : chest clothed with very short black hairs, beset 

 on each side with a few and behind with many bristles, adorned with 

 three paler slender brown stripes ; sides and breast pale brown, 

 thinly clothed here and there with hoary hairs : abdomen much nar- 

 rower than the chest, and much more than twice its length, taper- 

 ing from the base to the tip, covered with tawny down, clothed with 

 short black and whitish hairs, and with some long hairs on each 

 side of the base ; first and second segments very short ; third and 

 following segments long, successively decreasing in length; last 

 segments cylindrical, ferruginous, shining ; tip armed with a circlet 

 of short black spines: legs dark red, clothed with short whitish hairs, 

 armed with black spines ; claws black ; foot-cushions tawny ; hind 

 thighs black: wings yellowish brown ; wing-ribs and veins dark fer- 

 ruginous ; poisers piceous. Length of the body 10^ lines ; of the 

 wings 15 lines. 



Asilus Gorgasus, n. s., fem. Fuscus, thoracis vittis tribus pectoreque 

 cinereis, abdominis segmentorum marginibus posticis fulvis, an- 

 tennis pedibusque nigris, alis subcinereis apice obscurioribus. 



Body dark brown : head much narrower than the chest, covered 

 with hoary down, thickly clothed behind and beneath with golden 

 hairs, beset behind the eyes with a row of black bristles ; sides of 

 the crown and tubercle of the eyelets beset with black hairs ; front 

 and clypeus covered with tawny down ; clypeus thickly beset with 

 long black and pale yellow bristles : eyes dark bronze ; fore part 

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

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

 with long black hairs: feelers black; first joint beset with long 

 black bristles ; second joint with short black bristles ; third joint 

 spindle-shaped, slender, a little longer than the first and the second ; 

 bristle stout, much shorter than the first joint: chest thinly clothed 

 with short black hairs, beset on each side and behind with black 

 bristles, adorned with three slender gray stripes ; sides and breast 

 also gray : abdomen much narrower than the chest, and much less 

 than twice its length, tapering from the base to the tip, clothed with 

 short black hairs ; hind borders of the segments tawny ; first and 

 second segments very short; third and following segments long, 

 successively decreasing in length ; tip black, compressed : legs 

 black, clothed with short tawny hairs, armed with black spines ; 



