204 PERCY SLADEN TRUST EXPEDITION 



and great cross-veins, and ajJex of discal cell infuscated. Halteres entirely pale ochreous. 

 Abdomen dark brown, the spaces between the terga ochreous. 

 Length of body 5 mm. 



„ wing 4 mm. 



„ rostrum 4 mm. 



Loc. Seychelles. Mahe : 2$, one from Foret Noire, X. — XL 1908; marshes on 

 coastal plain at Anse aux Pins and Anse Royale, 1 $. 



C. seychellarum is closely allied to C. condgerum Speiser {imm-sampsoni Wesche) 

 {vide Ann. Mag. Nat. Hist., ser. 8, viii. 1911, p. 279), differing chiefly as follows: the 

 spots on the wings are fainter, and there is no spot on the 1st longitudinal vein midway 

 between the base and the origin of the prsefurca, which is well-marked in C cornigerum ; 

 the rostrum is relatively longer and the second joint of the antenna smaller. From 

 Toxorrhina madagascariensis Meunier, the present species is distinguished by the 

 neuration (?), and by its smaller size and relatively longer rostrum ; the third joint of the 

 antennge is a little larger. It is possible that these three may eventually prove to be 

 only local forms of a rather variable species. 



Genus Ohimarga Osten-Sacken, Mon. N. Am. Dipt., iv. 120. x. (18G9). 



13. Orimarga scotti, sp. n. $. (Plate 10, tig. 8, wing.) 

 Subrufescenti-cinerea, antennis palpisque nigris, pedibus fuscis ; alis hyalinis, venula 



transversa, magna prope ortum prsefurca^ inserta, venula transversa marginali ad apicem 

 vense longitudinalis primse inserta, celluM posteriore tertia pedunculo longiore. 



$. Head blackish, antennse and palpi black. First joint of antennse three times the 

 length of the second, joints of flagellum cylindrical, half as long again as broad. Rostrum 

 half as long as head. Tliorax greyish ochreous, more grey above. Legs light fuscous, 

 femora except apex testaceous. Wings hyaline, stigma absent or very pale. Marginal 

 cross-vein near apex of first longitudinal, which is indistinct and bent sharply up towards 

 the costa ; great cross-vein nearly opposite the origin of the praefui-ca ; third posterior cell 

 longer than its petiole, rounded at the base ; submai'ginal and first posterior cells 

 contracted at apex. Abdomen dark brownish ochreous, genitalia ochreous. 



Length of body 6 mm. 

 ,, wing 6 '5 mm. 



Loc. Seychelles. Mahe: Cascade Estate, 800—1500 ft., 1909, 1 ^. 



14. Orimarga fryeri, sp. n. ^. (Plate 10, fig. 9, wing.) 



Ochreo-cinerea, antennis palpisque nigris, pedibus testaceis ; praefurca angulat^, 

 cellula posteriore tertia pedunculo breviore. 



$. Head blackish, palpi black. Antennse brownish fuscous, shorter than the 

 thorax; joints of flagellum ovate, rather shortly hairy, half as long again as broad. 

 Rostrum as long as head. Thorax and abdomen ochreous grey. Legs very slender, 

 testaceous, apices of femora darker. Wings hyaline, stigma absent ; prsefurca rather 



