208 PERCY SLADEN TRUST EXPEDITION 



This is a strikingly isolated genus, more so perhaps than any other in the Limnobina 

 anomala ( = Khamphidinai of Kertesz). The insects with their short antenna3 and legs, 

 rather long and narrow wings, and elongated abdomens, look more like Chironomidse than 

 Limnobiidse ; the resemblance may be only superficial, or may indicate an ancestral con- 

 nection with that family. Brunetti (Rec. Ind. Mus. vi. 1911, p. 297) places the genus 

 in the Eriopterini between Mongoma and Gonomyia ; I cannot follow him in this, as 

 I consider Styringomyia is much more nearly related to Teucholabis and Paratropesa. 



Styringomyia seems to occur throughout the Ethiopian, Oriental and Australasian 

 regions. The first recent species described was S. didyma Grimshaw, from the Sandwich 

 Islands. This has since been recorded from the Caroline Islands (as Idiophlebia pallida), 

 Semarang, Batavia, Pasuruan, and Queensland. The second species, S. {Idiophlebia) 

 C7-assicosta Speiser, was described from Kamerun ; it is widely distributed in Africa ; the 

 British Museum possesses specimens from N. Nigeria, Gold Coast, Mashonaland, Natal, 

 Brit. E. Africa and Delagoa Bay ; I have also seen it from the Cape of Good Hope ; 

 Mr C. P. Alexander redescribes it (Can. Ent., 1912, p. 83, as S. howardi) from Queliniani, 

 Zambesi River. My S. ceylonica from Ceylon (also found in India and the Straits 

 Settlements) may be only a form of S. crassicosta, but there are slight differences 

 in the $ genitalia ; it is rather surprising, considering this distribution, that it is not 

 the species found in the Seychelles. I should say that, through the kindness of 

 Prof Sjostedt, I have examined the type of ^S'. c7'assicosta and compared it with the 

 British Museum specimens. It closely resembles >S. seychellarum ; the marked differences 

 in the genitalia have already been pointed out. Brunetti {loc. cit. pp. 300, 301) describes 

 two species from Nepaul and S. India. Finally, it may be mentioned that three species 

 (two from Africa, one from Straits Settlements) in the British Museum collection await 

 description. 



The original description of S. venusta Loew is not full enough for a detailed compari- 

 son to be made, but it would seem to be distinct from any living species by the shortness 

 of its wings. These do not vary perceptibly in length (relatively to the length of the 

 body) in the Seychelles species. Loew (Bernstein und Bernsteinfauna, p. 38, 1850) men- 

 tions, but does not describe, another species in the name of S. gracilis. 



Group Eriopterini. 



Genus Ormosia Rondani, Prodr., i. 180 (1856). 



Rhypholophus Kolenati, Wien. Ent. Monatschr., iv. 393 (1860). 



19. Ormosia perpusilla, sp. n. (Plate 10, fig. 12, wing; plate 11, fig. 10, ^ 

 genitalia.) 



Parva, ochracea ; alis hirsutis, infuscatis, cellula discoidali aperta ; antennis thorace 

 brevioribus. 



<?. Head brownish ochreous, antennae a little shorter than thorax, joints of flagellum 

 about as long as broad. Thorax dark brown above, ochreous on pleurae, without any 

 distinct markings. Legs brownish ochreous. Wings fuscous-tinged, rather densely hairy, 

 hairs on the veins, flattened and scale-like. Marginal cross-vein just before base of 



