866 LIST OF DIPTERA. 



Group XIV. Formosia? Guerin, Rev. Zool. 1843. 



Dexia Hypsa, n. s., mas. Cyaneo-viridis, scutello ceneo-viridi, abdo- 

 mine aureo-viridi albo micante segmentorum marginibus posticis 

 nigris, apice cupreo, palpis ferrugineis, antennis piceis, pedibus 

 nigris femoribus tibiisque apice ferrugineis, alis limpidis. 

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

 tawny covering above, ferruginous along the sides of the face, dark 

 bluish green beneath, where it is thickly clothed with hoary hairs; 

 epistoma prominent ; sides of the face not bristly ; no middle ridge: 

 eyes dark red, meeting on the crown ; fore part flat, its facets very 

 much larger than those elsewhere : sucker black, clothed at the tip 

 with tawny hairs ; palpi ferruginous, long, slender, beset with short 

 black hairs : feelers pitchy, nearly as long as the face ; third joint 

 slender, linear, rounded at the tip, about six times the length of the 

 second; bristle black, very deeply feathered, much longer than the 

 third joint : chest in front purple, tinged with blue and green ; hind 

 part and scutcheon mostly coppery-green ; breast bluish green, 

 clothed with tawny hairs, brassy on each side : abdomen obconical, 

 much shorter but not broader than the chest ; first, second, and 

 third segments golden-green, with a slight white bloom, bluish along 

 the hind borders, which are black; fourth and fifth segments reddish 

 copper-colour, clothed with tawny hairs; hind border of the fourth 

 segment dark blue: legs black, clothed with black hairs and bristles ; 

 thighs and shanks dark ferruginous towards the tips ; foot-cushions 

 tawny : wings colourless, with a dark brown spot near the base, 

 which is slightly tawny ; wing-ribs pitchy ; veins black ; tip cross- 

 vein forming hardly more than a right angle with the fourth longi- 

 tudinal vein, curved slightly inward along the whole length, joining 

 the border at some distance above the tip of the wing ; lower cross- 

 vein with two very slight curves, the lower inward, rather more dis- 

 tinct than the other, which is outward ; scales gray. Length of the 

 the body 4 lines ; of the wings 10 lines. 



Dexia Chrysame, n. s., fem. Aureo-viridis, maculis albis ornata, 

 capite aureo, palpis fulvis, antennis ferrugineis, pedibus nigris, 

 alis limpidis. 



Body clothed with black hairs and bristles : head bright gold- 

 colour, white behind, clothed beneath with tawny hairs ; crown very 

 broad ; epistoma prominent ; face with a high middle ridge, its 

 sides fringed with bristles along half the length: eyes dark red, 

 with a black stripe near the hind border ; fore part convex, its facets 



