58 P. W. EDWARDS — FURTHER NOTES ON AFRICAN CULICIDAE. 



C. pallidocephalus from C. ager or C. tipuliformis, which could not possibly be 

 confused. If there were only one specimen it might have been regarded as a 

 remarkable monstrosity or perhaps a hybrid ; the occurrence of two other similar 

 specimens makes both these hypotheses, especially the former, improbable. How 

 the females of C. pallidocephalus and C. mirificus may be distinguished I cannot say. 



British East Africa: 1 $ (type), Njoro, 28 i. 1912 (T. J. Anderson), 

 2 d\ L. Nakuru, 20 ii. 1911 {Dr. H. A. Bddeker). 



Ten females taken by Dr. Bodeker at the same time and place as the males 

 may be either this species or C. pallida eephalus. The three males and five 

 females have been presented to the British Museum by the Imperial Bureau of 

 Entomology. 



Culex decens, Theo., and C. invidiosus, Theo. 



The genitalia have the harpes with an even larger basal projection than in 

 C. pallidocephalus ; the harpagones are divided into three plates, of which the 

 second is toothed. 



Culex simpsoni, Theo. 



The genitalia resemble those of C. decens and C. invidiosus, but the third plate 

 of the harpagones is not distinctly separated from the second, which is toothed 

 otherwise than in the two species named. C. simpsoni varies a good deal in size ; 

 it closely resembles C. univittatus, except that the tibiae are without the pale 

 stripe ; the coloration of the thorax is the same in the two species. This 

 similarity has led to confusion ; the specimen which Theobald selected for his 

 male type of C. univittatus is really C. simpsoni, as also is the specimen referred 

 to by the writer (Bull. Ent. Res. iii, p. 32), as apparently a C. univittatus 

 lacking the tibial stripe. 



Culex univittatus, Theo. 



As in the three species last considered, the harpes have a very large basal 

 projection ; the harpagones are divided into only two plates, the second very 

 difficult to see ; it is untoothed, though emarginate at its tip. The side-pieces 

 and claspers of all species of Culex, except such abnormal ones as C. mirificus, 

 resemble one another extremely closely, and usually it is only in the small basal 

 parts that specific differences can be made out. 



In this species the femora sometimes show traces of white lines such as are 

 seen in C. tlpuliformis : these are particularly evident in some specimens from 

 Nairobi (T. J. Anderson). 



Culex hortensis. Fie. 



Culex horle?isis, Ficalbi, Bull. Soc. Ent. Ital. xxi, p. 27 (1889). 

 Maillotia pilifera, Theo., Mon. Cul. iv, p. 274 (1907). 

 Prof. Ficalbi has kindly sent me some specimens of C. hortensis, which have 

 enabled me to give the foregoing synonymy. Blanchard makes C. hortensis a 

 synonym of C. penicillatus, Oliv., but I cannot accept this, as it seems to me that 

 Olivier's original description clearly indicates Ochlerotatus lateralis, Mg. 



