LIST OF DIPTERA. 839 



the base ; third joint full thrice the length of the second, linear for 

 two-thirds of its length, thence slightly increasing in depth to the 

 tip, which is rounded, bristle more than twice the length of the 

 third joint, its first and second joints short ; third downy till near 

 the tip : chest adorned with four hoary stripes ; inner pair double ; 

 scutcheon purple : breast black, tinged with gray : abdomen a little 

 longer than broad, much broader but hardly longer than the chest, 

 adorned with two slender, indistinct, purple stripes, which are pa- 

 rallel and very near to each other ; under side purple, with hoary 

 reflections : legs black, clothed with black hairs and bristles ; foot- 

 cushions and claws tawny ; tips of the claws black : wings slightly 

 brown, tawny with colourless intervals at the base, and on nearly- 

 half the length of the fore borders ; wing-ribs and veins bright 

 tawny ; veins pitchy towards the tips ; tip cross-vein forming a 

 slightly obtuse angle with the fourth longitudinal vein, hardly 

 curved inward at the base, almost straight from thence to the tip, 

 joining the border at some distance above the tip of the wing ; 

 lower cross-vein with two very slight curves, the one near the 

 base and almost imperceptible, the other near the tip and rather 

 more distinct ; scales pale tawny. Length of the body 8 lines ; of 

 the wings 20 lines. 



Dexia potens, Wied. Auss.Zweif. ii. 368, 1. Dinera potens, Macq. 



Hist. Nat. Dipt. ii. 210, 2. 

 a. Brazil. From Mrs. Noel's collection. 



Dexia Gortys, n. s., fern. Picea, capite antico ferrugineo, thoracis 

 lateribus pectore scutellique apice fulvis, abdomine fulvo,palpis 

 antennis pedibusque ferrugineis, alis Jlavo-fuscis. 



Body pitchy, clothed with black hairs and bristles : head ferru- 

 ginous in front; epistoma not prominent; sides of the face fringed 

 with bristles at the base : eyes pale red ; facets on the fore part 

 larger than those elsewhere : sucker and palpi ferruginous, beset 

 with black bristles : feelers pale ferruginous, shorter than the face ; 

 third joint linear, somewhat truncated at the tip, about thrice the 

 length of the second joint ; bristle much more than twice the length 

 of the third joint, deeply feathered till near the tip, where it is 

 black : chest on each side, breast and tip of the scutcheon tawny : 

 abdomen nearly oval, dull tawny, paler beneath, darker towards the 

 tip, a little broader but not longer than the chest : legs ferruginous, 

 clothed with black hairs and bristles ; feet furnished beneath with 

 golden down ; foot-cushions tawny ; claws black, ferruginous at the 

 base : wings yellowish brown, darkest along the fore borders ; wing- 



