46 n. C. EFFLATOUN. 



4. CERATITIS, Mac Leay. 

 Mac Leay, Zool. Jourii , IV. 475 (1829). 



Petalophora, Macq., Suit, à Buff., II. 454. 5. (1835) et Dipt. 

 ^xol., II. 3 part. (1843). 



Haltero-phora, Rond., Uipterol. Ital. Trodr., VII Ortalid. 29. 

 (1870). 



As restrieted hère thls genus is easily distinguished from any 

 nther by the arista which is pubescent on the upper sida only, the 

 oblique position of the médian cross-vein, and by the peculiar pat- 

 tern of the wings. 



Head as broad as high; face flat, very broad beneath; epistonia 

 nnt prominent; cheeks rather broad ; antennae inserted at the middle 

 of the eyes, short, the third joint at least twice the length of the 

 sec(jnd and rounded at the tip; arista very long, shortly pubescent 

 on the upper side only; s.or.1, i.or.2; oc. long and robust; prt. 

 parallel; ocp. well developed, black; genal bristle weak; ail the 

 bristles are black except the ])vt. yellow and the genal bristle pale 

 yellowish. 



Thorax and scutellum black with conspicuous grey markings 

 owing to a dense shining pulverulence of that colour; chaetotaxy 

 complète; de. nearer to the suture than to the scutellum; 1 mpL; 

 2)t. strong; the f/..«c. a little shorter than the b.sc. and converging 

 at the apex. 



Abdomen broad and short, bristly on the sides and at the end ; 

 maie hypopygium small but fairly prominent; ovipositor short and 

 flat. 



Legs robust, not long; front femora in the maie much more 

 bristly than in the female; middle tibiae with a single spur. 



Wings very broad and short with yellow and brown cross-bands 

 and blackish streaks at the base ; Kl short ; R2 + 3 and 114 + 5 straight, 

 the latter bristly throughout its length; radio-median cross-vein at 

 the middle of Ist M2 cell ; médian cross-vein oblique owing to which 

 the inferior angle of Ist M2 cell is acute; M cell a little dilated : 

 Cu 2 very deeply curved in the middle and the lowcr angle of Cu cell 

 drawn ont into a point as long as M cell. 



