856 LIST OF DIPTERA. 



Dexia Ethoda, n. s., fern. Cyaneo-viridis albo micans, thorace vit- 

 tis una cenei duabusque aureo-viridibus ornato, scutello ceneo- 

 purpureo, pectore purpureo-cyaneo, abdomine viridi pnrpureo 

 cyaneoque ornato, palpis fulvis, antennis pedibusque niyris, alls 

 subcinereis. 



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

 with a white covering; a black stripe, gray on the disk, and having 

 a ferruginous spot at each end between the eyelets and the feelers ; 

 epistoma black, very prominent ; sides of the face fringed with bris- 

 tles for more than half the length : eyes pitchy ; fore part slightly 

 convex, its facets not larger than those elsewhere : sucker black, 

 pitchy and clothed with yellow hairs at the tip ; palpi dark tawny, 

 pitchy towards the tips, clothed with black hairs : feelers black, 

 tinged with gray, much shorter than the face; third joint linear, 

 rounded at the tip, about twice the length of the second ; bristle 

 downy, nearly thrice the length of the third joint : chest bluish 

 green, tinged with white, fore part adorned with a narrow brassy 

 stripe, and with a broad golden-green stripe on each side ; disk of 

 the hind part and scutcheon coppery-purple ; hind border of the 

 scutcheon armed with shining black bristles ; breast purplish blue : 

 abdomen short-obcouical, a little broader but not longer than 

 the chest, furrowed and striped with black on the back, notched in 

 the tip ; first segment bluish green ; second segment coppery- 

 purple, with golden-green reflections, its hind border armed with 

 black spines, and adorned with a bluish black band bordered with 

 green ; third segment like the second, but the purple predominates 

 over the golden-green ; fourth segment green, coppery-purple on 

 each side, its hind border armed with black spines ; fifth segment 

 golden-green, coppery-purple on the fore border, intense blue on the 

 hind border ; fore borders of the segments adorned with awhite co- 

 vering ; underside bright deep blue, purple on the hind border of 

 each segment ; third segment mostly green : legs black, clothed 

 with black hairs and bristles ; foot-cushions pitchy : wings slightly 

 gray ; a brown spot near the base ; wing-ribs and veins ferruginous; 

 tips of the veins black ; tip cross-vein forming a slightly obtuse an- 

 gle with the fourth longitudinal vein, having an almost imper- 

 ceptible inward curve from the base till near the tip, where it is 

 slightly inclined outward ; lower cross-vein with two curves, the 

 lower inward, the other outward, more slight and irregular than the 

 first. Length of the body 8 lines ; of the wings 18 lines. 

 a. Swan River. Presented by Sir John Richardson. 



