LIST OF DIPTERA. 851 



Dexia loDgipes, var. ? Macq. Dipt. Ent. Suppl. 1846, 187, 4. 

 Mas. et fern. Cana, capite albo, thoraci vittis sex piceis, abdo- 

 mine fulvo-cano micante, segmentorum suturis nigris, antennis 

 piceis, articulo 3° pedibusque nigris, alis sublimpidis. 



Male. — Body hoary, clothed with black hairs and bristles: head 

 white, prominent in front, thickly clothed beneath with white hairs ; 

 a pitchy stripe fringed with bristles tapering from the feelers to- 

 wards the eyelets, where it again widens ; face narrow, pale tawny, 

 fringed with bristles at the base ; epistoma prominent : eyes deep 

 red, not hairy : sucker black, long, ferruginous and clothed with 

 tawny hairs towards the tip ; palpi short, tawny, beset with black 

 bristles : feelers pitchy, shorter than the face ; third joint black, 

 slender, linear, rounded at the tip, more than thrice the length of 

 the second joint ; bristle tawny, feathered to the tip, stout for about 

 one-sixth of the length from the base, near which it is encircled by 

 a broad black band : chest with three slender, indistinct, pitchy 

 stripes on each side : abdomen obconical, narrower, but hardly 

 larger than the chest, adorned with hoary reflections, which have a 

 tawny tinge ; sutures of the segments black : legs black, slender, 

 very long, clothed with short black hairs ; each of the two hinder 

 pair nearly twice the length of the body ; foot-cushions pale tawny : 

 wings nearly colourless ; wing-ribs and veins tawny ; veins black 

 towards the tips ; tip cross-vein forming a slightly obtuse angle 

 with the fourth longitudinal vein, irregularly and very slightly 

 curved inward till near the tip, where it is a little inclined outward, 

 joining the border at a short distance above the tip of the wing ; 

 lower cross-vein with two curves, the lower inward and hardly per- 

 ceptible, the other distinct and outward ; scales large, white, with 

 tawny borders. Female. — Abdomen nearly elliptical, a little shorter, 

 but not narrower than the chest : curve of the tip cross-vein more 

 irregular than that of the male ; inner curve of the lower cross-vein 

 more distinct. Length of the body 6 lines ; of the wings 14 lines. 



a. Van Dieman's Land. Presented by the Eev. T. Ewing. 



b. New Holland. 



Group IX. Cordyligaster, Macq. Dipt. Exot. ii. 2, 90. 



Dexia petiolata, Wied. Auss. Zweif. ii. 374, 10. Cordyligaster pe- 

 tiolatus, Macq. Dipt. Exot. ii. 2, 90, 1. Nigra, capite argenteo, 

 thorace albo ornato, abdominis suturis canis, palpis anteunis pe- 

 dibusque nigris, alis cinereis. 



Body black, clothed with black hairs and bristles : head adorned 

 with silvery lustre, clothed beneath with white hairs ; a black stripe 

 fringed with bristles between the eyelets and the feelers ; epistoma 



