LIST OF DIPTERA. 857 



Dexia inornata. Rutilia inornata, Guerin, Rev. Zool. 1843, 268, 



7. Macq. Dipt. Exot. Suppl. 1846, 178, 7, pi. 16, /. 5. 

 a. New Holland. 



Dexia Potina, n. s., fern. Picea, albo ornata, scutello abdominisque 

 segmentorum marginibus anticis ferrugineis, palpis fulvis, anten- 

 nis piceis, pedibus nigris, alis limpidis. 



Body clothed with black hairs and bristles : head pitchy, 

 adorned with a white covering, which does not appear on the broad 

 furrowed stripe between the eyelets and the feelers ; epistoma tawny, 

 shining, very prominent ; middle ridge of the face tawny, covered 

 with white bloom ; sides covered with tawny down, fringed with 

 bristles for more than half the length : eyes dark red ; facets of the 

 fore part very small : sucker black, clothed at the tip with tawny 

 hairs : palpi long, slender, dark tawny, clothed with short black 

 hairs ; their tips black : feelers pitchy, not more than half the 

 length of the face ; second joint armed with a long bristle ; third 

 joint linear, rounded at the tip, more than twice the length of the 

 second ; bristle black, slightly downy, much more than twice the 

 length of the third joint: chest pitchy, armed with some black 

 spines at the base of the wings ; hind part and scutcheon ferrugi- 

 nous : abdomen pitchy, Obconical, full as broad and as long as the 

 chest ; fore borders of the segments somewhat ferruginous, tinged 

 with white bloom'; hind border of the third segment armed with 

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

 cushions tawny : wings colourless, with a large brown spot near the 

 base, which is tawny ; wing-ribs and veins ferruginous ; veins black 

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

 with the fourth longitudinal vein, very slightly curved inward near 

 the base, straight from thence to the tip, where it is very slightly 

 curved outward, joining the border at a short distance above the tip 

 of the wing; lower cross-vein with two curves, the lower inward, 

 much deeper and shorter than the other, which is outward ; scales 

 whitish, with yellow borders. Length of the body 7 lines ; of the 

 wings 16 lines. 

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



Dexia Barcha, n. s., fern. Ferruginea, capite piceo, thoracis disco, 

 abdominis vitta et segmentorum marginibus posticis nigris, mar- 

 ginibus anticis albo ornatis, palpis fulvis, antennis piceis , pedi- 

 bus nigris, alis limpidis. 



Body clothed with black hairs and bristles : head pitchy ; a 

 black stripe between the eyelets and the feelers; epistoma black, 

 very prominent ; fore border ferruginous ; facials dark red ; middle 

 PART IV. 4 F 



