874 DIPTERA OF AUSTRALIA, 



372. Gynoplistia melanopyga, Schiner. (PL xxiii. fig. 36). 



Gynoplistia inelanopyga (^J), Sch., Dipt. 'No vara' Exp. Zool. 

 Theil, Bd.ii. p. 39, 1868. 



$. — Length of antennae 0-120 inch ... 3*04 millimetres. 



Expanse of wings 0-350 x 0-090 ... 8-87 x 2-27 



Size of body 0-420x0-060 ... 10-66x1-54 



Head shining black, with black hairs ; rostrum, palpi and 

 antennae black ; the latter 19- or 20-jointed ; the first 12 or 13 

 flagellar joints with long branches, decreasing in length from the 

 ninth or tenth joint, the thirteenth, when present, a mere rudi- 

 mentary tooth ; last five joints sub-elliptical, the terminal one 

 usually more elongate ; the first two branches directed outwards. 

 Thorax black, shining ; pleurae and coxae with a grey or yellowish- 

 grey bloom. Halteres brown with a black club. Abdomen 

 reddish-fulvous ; the first segment and last two or three, including 

 forceps, violaceous-black (the apex of basal pieces of latter slightly 

 reddish-brown) ; forceps armed with a single, somewhat thick, 

 slightly bent appendage, tridentate at the extremity, and some 

 peculiar appendages of the internal apparatus (PI. xxiv., fig. 67). 

 Coxae, tibiae and tarsi black, except that the hind tibiae are 

 brownish-fulvous, with a slight black ring at base and a broad 

 one at apex, sometimes also the fore and intermediate pair ; 

 femora reddish-fulvous, with a ring of black at apex. Wings 

 with a pale brownish tint, fulvous at base, the apex, costal cell 

 and the posterior veins slightly inf uscated ; three brown spots ; 

 first spot filling bases of basal cells ; second squarish, usually 

 slightly smaller than the first, situated at origin of second longi- 

 tudinal vein ; third larger, somewhat roundish, extending from 

 costa, at stigma, to inner end of discal cell. Auxiliary vein 

 reaching costa almost opposite inner end of first sub-marginal cell ; 

 sub-costal cross-vein near its tip ; first longitudinal reaching costa 

 at a point more than midway between tips of auxiliary vein and 

 anterior branch of second longitudinal vein ; marginal cross-vein 



