BY FREDERICK A. A. SKUSE. 861 



Two sub-marginal cells ; five (rarely only four"^) posterior cells ; 

 discal cell closed ; auxiliary vein reaching costa more or less 

 opposite inner end of second sub-marginal cell ; sub-costal cross- 

 vein near its tip ; first longitudinal vein reaching costa about 

 opposite middle of anterior branch of second longitudinal vein ; 

 first sub-marginal cell with a short petiole ; seventh longitudinal 

 vein distinctly sinuated. Wings glabrous. Eyes glabrous. 

 Antennae 16- to 20-jointed, usually most of the flagellar joints 

 unipectinate in both sexes. Tibiae spurred ; empodia distinct ; 

 ungues smooth. The forceps of the male Liimiophila-like ; 

 usually with only one horny claw-shaped appendage. 



Rostrum short, with large suctorial labella. Head wider than long ; 

 eyes round, slightly emarginate at base of antennie ; front broad ; 

 palpi tolerably long, joints about equal or the first shortest. The 

 antennpo usually short, shorter in ^ than in ^, seldom reaching 

 beyond the root of the wings if bent backwards, reaching beyond 

 only in G. vilis (^^) ; the number of joints varies from 16 to 20 in 

 both sexes, the number being somewhat variable in individuals of 

 the same species ; in ^ the first 10 to 15, and in ^ the first 8 to 12, 

 flagellar joints unipectinate, the branches shorter in ^ than in g 

 (in G. jucunda^ O.-Sack., from Celebes, only the first 6 flagellar 

 joints are branched in both sexes) ; the branches are on the inner 

 side of the antennae, except the two first which are directed out- 

 wards, only in G. vilis are the three first directed outwards. 

 Baron Osten-Sacken (Studies IT. p. 210), says "the three first 

 branches in all the species are inserted sideways, and hence are 

 pointing in a direction difi'erent from that of the others," but I 

 find that the third branch, in all but G. vilis, is inserted scarcely 

 more sideways than the following ones ; in the last-named species, 

 the fourth branch is situated similarly to the third in the remaining 

 species. Macquart's figures of the antennae of G. vilis (Dipt. Exot. 

 4th Suppl. pi. i. fig. 2) and of G. hella {yariegata, Macq.) correctly 

 show the difierence between them. The terminal joints of the 



* Only four posterior cells in Gyn. jucunda, O.-Sack., from Celebes (Ann. 

 del Mus. Civ. di St. Nat. di Gen. XVI. 1881, p. 405). 



