﻿AFRICAN CULICIDAE, OTHER THAN ANOPHELES. 23 



22. 0. nigricephalus, Theo. (Stegomyia), Kept. Liyerp. S. Trop. Med. Mem. IV> 



app. (1901). 

 Phagomyia nigricephala, Theo., Gen. Ins. Culicidae, p. 21 (1905). 

 Myxosquamus paludosus, Graham, Ann. Mag. Nat. Hist. (8) V, p. 270 (1910). 

 This species should be easily recognised by its almost uniform black colour, 

 the only other black species being O. caliginosus, which has basal white bands on 

 the abdominal segments, while in this species there are only white lateral spots. 

 O. nigricephalus has a similar scutellar scaling to that of the following species, 

 but the scales are all black. The type of O. nigricephalus appears to have been 

 lost (it is missing from the British Museum Collection), but from the description, 

 and from a damaged specimen so named by Theobald, there seems little doubt 

 that it is the same as Graham's species. 

 S. Nigeria. 



23. 0. irritans, Theo. (Stegomyia), Kept. Liverp. S. Trop. Med., Mem. IV, 



app. p. iii. (1901). 

 Catageiomyia senegalensis, Theo., Kept. Liverp. S. Trop. Med., Mem. XI, 



app. p. 1 (1903). 

 Aedimorplius albotaeniatus, Theo., Mon. Cul. V, p. 204 (1910). 

 Myxosquamus confusus, Theo., Mon. Cul. V, p. 225 (1910). 

 Phagomyia irritans, Theo., Gen. Ins. Culicidae, p. 21 (1905). 

 The members of the group to which O. irritans belongs are not very easily 

 separated. Perhaps the best character for this species is the scaling of the 

 scutellum. The middle lobe bears a variable number of cream-coloured narrow 

 curved scales, mixed with flat black ones, some or all of the flat ones being occa- 

 sionally also cream-coloured ; the lateral lobes bear only creamy narrow curved 

 scales. The abdominal segments have narrow basal pale bands ; the tip of the 

 hind tibiae is white, but not conspicuously so. It thus approaches rather closely 

 to O. minutus var. stenoscutus. The species seems to be very abundant at Accra. 

 There is no doubt about the synonymy given above. The remarks made con- 

 cerning O. apicoannulatus (p. ) might be applied with added force here. 

 Senegal ; Gold Coast ; S. Nigeria. 



24. 0. OChraceus, Theo., Mon. Cul. II, p. 103 (1901). 



Additional locality : British East Africa ( C. W. Woodhouse and W. Kennedy). 



26. 0. quasiunivittatus, Theo., Mon. Cul. II, p. 32 (1901). 

 Additional localities : British East Africa ; Uganda. 



28. 0. dentatus, Theo. (Culex), First Rept. Welle. Lab., p. 75 (1905). 



Culex pallidopunctata, Theo., U. South Afr. Dept. Agric, First Rept. Yet. 

 Res., p. 267 (1911). 

 Theobald does not compare C. -pallidopunctata with O. dentatus, but describes 

 the hind claws of the female as being simple ; he states that C. pallidopunctata 

 was described from a series of 58 females. Evidently this series was really a 

 mixed one, for out of four females presented by him to the British Museum, 

 two (including the holotype) are typical O. dentatus with toothed hind claws ; 

 one appears to be O. quasiunivittatus from the thoracic scaling, but the hind 

 tarsi are missing ; the fourth is a Culex pipiens var. pallidocephalus ! 



