LIST OF DIPTERA. 321 



slightly tapering from the base to the tip, as long as the first and the 

 second; fourth joint not one-third of the length of the third; fifth joint 

 extremely short : neck with a ruff of hoary hairs : chest thinly clothed 

 with long slender black hairs, and having a broad piceous stripe in 

 the middle: breast with a few scattered hoary hairs : abdomen nearly 

 linear and cylindrical, narrower than the chest and about twice its 

 length, black at the tip, thinly clothed with short hoary hairs, and 

 towards the base with longer hairs, and with a few bristles of the 

 same colour ; first and second segments short ; third and following 

 segments long, but successively decreasing in length : legs clothed 

 with hoary hairs and beset with tawny spines ; hips gray ; thighs 

 purplish bronze ; shanks ferruginous, with black tips; feet black; 

 claws black ; foot-cushions tawny ; fore shanks unarmed : wings co- 

 lourless, light gray at the tips; wing-ribs ferruginous ; veins piceous, 

 black towards the tips ; poisers tawny, with piceous knobs. Length 

 of the body 5j lines ; of the wings 8 lines. 



a. Swan River. Presented by Sir J. Richardson. 



Dasypogon Aoris, n. s., fern. Fuscus, thoracis vittis tribus lateri- 

 busque fulvis, pectore cano, abdominis apice nigro, antennis ni- 

 gris, pedibus cinereis, alis subfuscis. 



Body dark brown : head a little narrower than the chest, co- 

 vered with whitish down and clothed with white hairs behind and 

 beneath : crown with a stripe of pale yellow down and some whitish 

 hairs on each side ; front and clypeus covered with yellow down ; 

 clypeus armed with yellow hairs and bristles, the latter in front : 

 eyes black ; fore part slightly convex, its facets not much larger 

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

 yellow hairs ; palpi black, beset with long pale yellow hairs : feelers 

 black; first and second joints clothed with pale yellow hairs ; second 

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

 than the first and the second joints ; fourth and fifth joints forming 

 a spine, which is about one-sixth of the length of the third joint: 

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

 and behind with some white bristles, adorned with three tawny 

 stripes ; middle stripe indistinct ; sides tawny : breast hoary, partly 

 clothed with white hairs : abdomen narrower than the chest and 

 nearly twice its length, slightly tapering from the base to the tip, 

 clothed with yellow hairs, which are longer and more numeroas to- 

 wards the base, black, shining, and crossed by numerous little fur- 

 rows towards the tip ; first and second segments very short ; third 

 and following segments long, successively decreasing in length ; tip 

 armed with a circlet of short black spines : legs gray, thickly clothed 

 with whitish hairs, armed with white spines, which are numerous 



