410 LIST OF DIPTERA. 



the tips ; wing-ribs ferruginous ; veins black ; poisers tawny. 

 Length of the body 11 lines ; of the wings 18 lines. 



a. ? From Mr. Children's collection. 



Group IX. 



Asilus Herminius, n. s., fem. Ferrugineus, abdominis segmentorum 

 marginibus posticis fulvis apice piceo, antennis nigris, pedibus 

 fulvis, femoribus anterioribus ferrugineis nigro viltatis, alis ful- 

 vis apice fuscis. 



Body ferruginous : head much narrower than the chest, clothed 

 behind and beneath with yellow hairs, beset behind the eyes with 

 tawny bristles ; front and clypeus adorned with golden down ; cly- 

 peus armed with a thick cluster of yellow bristles : eyes black, rather 

 small ; fore part convex, its facets not larger than those of the other 

 part : lip black, shining, clothed at the tip with short tawny hairs ; 

 tongue yellow ; palpi black, beset with black hairs : feelers black ; 

 first and second joints red, beset with some short black hairs ; 

 second joint slightly club-shaped, a little more than half the length 

 of the first ; third joint very long, slender, slightly tapering from 

 the base to the tip, more than twice the length of the first and of 

 the second ; fourth and fifth joints like a short spine, which is about 

 one-fifth of the length of the third : chest thinly clothed with very 

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

 bristles : breast clothed here and there with tawny hairs : abdomen 

 thrice the length of the chest, slender, very slightly tapering from 

 the base to the tip, thinly clothed with very short black hairs, shin- 

 ing towards the tip, which is piceous ; hind border of every segment 

 tawny, and especially so on each side ; first and second segments 

 very short; third and following segments long, but successively, 

 though slightly decreasing in length : legs tawny, thickly clothed 

 with tawny down, armed with a few black spines ; feet thickly armed 

 beneath with short black spines, and at the tips with two long curved 

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

 front thighs ferruginous, striped with black : wings deep tawny, 

 brown towards the tips and along the hind borders, reaching when 

 closed, nearly to two-thirds of the length of the abdomen ; borders 

 of the veins paler ; wing-ribs and veins ferruginous, the latter 

 piceous towards the tips ; poisers yellow. Length of the body 14 

 lines ; of the wings 17 lines. 



a. Massachusetts. From Prof. Sheppard's collection. 



