412 LIST OF DIPTERA. 



Asilus Ladon, u. s., fern. Fuscus, thoracis vittis tribus pectoreque 

 cinereiS) abdomine subcompresso dorso carinato, antennis pedi- 

 busque nigris, alis subfulvis. 



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

 white down, clothed behind and beneath with white hairs, beset be- 

 hind the eyes with a row of black bristles ; sides of the crown and 

 tubercle of the eyelets covered with black hairs ; sides of the crown, 

 front, and clypeus covered with tawny down ; clypeus thickly beset 

 with white bristles, and also armed with a few black hairs and bris- 

 tles : eyes reddish bronze ; fore part flat, its facets much larger than 

 those of the other part : lip black, clothed at the tip with short pale 

 yellow hairs : feelers black ; first and second joints clothed with 

 pale yellow hairs ; first joint armed with long black bristles ; second 

 joint club-shaped, much shorter than the first ; third joint spindle- 

 shaped, rather slender, a little shorter thau the first and the second ; 

 fifth joint stout, and not like a bristle, tapering from the base to the 

 tip, nearly half the length of the third : chest thickly clothed with 

 long and slender black hairs, beset on each side and behind with 

 white bristles, adorned with three indistinct gray stripes ; sides and 

 breast also gray, partly clothed with tawny hairs ; fore chest short, 

 clothed with tawny hairs and with a row of black bristles: abdomen 

 slightly compressed, keeled along the back, tapering from the base 

 to the tip, narrower than the chest, and much less than twice its 

 length, covered with dull tawny down ; hind borders of the segments 

 beset with long pale yellow bristles ; first and second segments very 

 short ; third and following segments long, successively decreasing 

 in length ; tip shining, piceous : legs black, clothed with short 

 whitish hairs and with white spines, and also armed with black 

 spines ; claws tawny towards the base ; foot-cushions tawny : wings 

 with a slight tawny tinge, reaching, when closed, to the tip of the 

 abdomen : wing-ribs and veins piceous, the latter black towards the 

 tips ; poisers yellow. Length of the body 7 lines ; of the wings 

 11 lines. 



Asilus Phceax, n. s. Fuscus, capite aureo piloso, thorace nigro- 

 fusco maculato et univittato, abdominis apice nigro, antennis ni- 

 gris, pedibus fuscis, alis subfuscis. 



Body brown : head a little narrower than the chest, clothed 

 with tawny hairs ; crown beset with a few black hairs ; clypeus and 

 each side of the fore part most thickly covered with pale golden 

 hairs : eyes black ; fore part nearly flat, its facets not much larger 

 than those of the other part, from which it is hardly distinct : lip 

 black, shining, clothed at the base with long, and at the tip with 



