LAMB— DIPTERA : LONCHjEID^, SAPROMYZID^E, EPHYDRID^E, ETC. 321 



Thorax slightly greyer in tone with the scutellum more pointed, and not abruptly 

 cut across. 



Wings, as Fig. 10, with blackened costa. 



Halters pale yellow. 



Legs the same, front pair all black, middle and hind black except for the bright red 

 first to fourth joints to the tarsi. 



Size. Most specimens are from 3 to 31 mm., but one measures only 2^ mm. 



Localities. Seychelles. Mahe : from marsh just behind beach at Port Glaud, 5. XL 

 1908 ; Anonyme Island, I. 1909 ; marshy ground near sea-level at Cascade, 20. II. 1909 ; 

 marshes on coastal plain, Anse aux Pins and Anse Royale, I. 1909. 



Ilythea, Haliday. 



Rythea Haliday, Ann. Mag. Nat. Hist., ser. 1, iii. (1839), p. 408. 



Two species of this interesting genus were collected, but unfortunately the specimens 

 were not in first-rate condition so that very full descriptions cannot be given. 



Fig. 10. Discomyza similis, n. sp., wing. Fig. 11. Ilythea fraclivirgata, n. sp., wing. 



22. Ilythea fractivirgata, n. sp. 



Head. Profile very like I. spilota Curtis, except that the back of the head behind and 

 below the eyes is not quite so swollen. Chsetotaxy the same but the bristles less strong. 

 Antennae similar, but the third joint slightly smaller and the five aristal rays propor- 

 tionately longer. In top view the head is not quite so flattened, and in front view the 

 shining elongate central knob does not extend so far down to the mouth-margin. 



The frons is shining, while the face, jowls and lower eye-margins are dusted with 

 grey. The palpi are long, thin and pale with a few bristles near the end ; tongue yellow 

 with a bent-back tip. 



Thorax. Dorsum and scutellum shining blue-black, slightly dusted : as far as can 

 be seen the chastotaxy is normal, but the bristles are again proportionately weaker. 



Wings as in Fig. 11, with remarkable interrupted blackish transverse bands, three in 

 number. 



Halters yellow. 



Legs all yellow. 



41—2 



