are analysed in this paper. Ten different species of niosquitos were 

 found in the 417 samples, viz : — Stegomyia fasckUa in SS'M per 

 cent., Cukx fatigans in 14-86 per cent., Anopheles coskdis in 

 0'95 per cent., Culex decens and CuUciomjiki nebniosa each in 0'71 per 

 cent., Stegomym lukocephala and ^S. mekdlka each in ()"47 per cent., 

 and Culex invidiosus, C. tkjripes var. fuscus, and Siegoingm nnilinecda 

 each in 0'23 per cent. Only the first two species can therefore be said 

 to be common domestic mosquitos in Accra. Six of the 417 

 samples were from the official residential area, all the rest being from 

 native compounds. A comparison is made between these results and 

 those which Graham obtained from 1,043 samples from the native 

 compounds at Lagos. In both cases S. fasckila is by far the commonest 

 species {92-5 per cent, at Lagos). C. fatigans, the only other species 

 that was at all common at Accra, was not found at Lagos in a single 

 .sample. An editorial note states that Dr. J. M. Dalziel has recorded 

 the capture at Lagos of two adult C. fatigans and five instances of the 

 larvae having been found there. Cidiciomyia nehvlosa, which came 

 second in Graham's list (21 -6 per cent.), was found in only three samples 

 from Accra, all from the residential quarter. The four species common 

 to the two lists are A. costaUs, C. decens, C. tigripes var. fuscus and S. 

 Jasciata. It is remarkable that the larvae obtained represent only ten 

 out of the forty-one species of adult mosquitos recorded at ilccra up to 

 1915, viz : — Anopheles coslalis, A.funestus, A. pharoensis, A. umbiosus, 

 ■Culex decens, C. duttoni, C. fatigans, C. grahmni, C. guiarti, 

 G. ins'ignis, C. invidiosus, C. ornatothoracis, C. qaasigelidus, C. thalas- 

 ■sitis, C. tigripes, C. tigripes var. fuscus, Culiciomyia nehulosa, 

 €yathomyia {Prototnelanoconion) fusca, Mansonioides africanus, 

 M. uniformis, Micraedes inconspicuosus, Mucidus mricidus, Ochlero- 

 tatus albocephalus, 0. irritans, 0. domesticus, 0. minutus, 0. minutus\a>r. 

 biammlatus, 0. minutus var. stenoscutus, 0. minutus var. tarsaJis, 

 O. nigrocephalus, 0. punctothoracis, Stegoinyia fasciata, S. luteocephah, 

 S. metallica, S. unilineata, Uranotaenia balfouri, U. connali, U. ma- 

 shonaensis, U. mayeri. Since 1915, additional species have been 

 collected. At Lagos, Graham obtained six species of larvae, while forty- 

 one species of adult moscjuitos were recorded there up to 1913. In 

 another table the mosquitos found at Accra as adults in a bungalovv' 

 and as larvae in the samples sent by the Medical Officer of Health, from 

 December 1914 to July 1915, are arranged according to frequency of 

 occurrence, and a consideration of the two lists shows that an examina- 

 tion of the larvae found in compounds not only fails to give any 

 adequate idea of the mosquito fauna of a town, but also fails to indicate 

 the species of mosquitos to the attacks of which the inmates of the 

 houses are hable. It also furnishes proof of the necessity for extending 

 anti-mosquito measures so as to reach the species that breed far afield. 



In one instance collections made in a native house in a part of Accra 

 where S. fasciata abounds yielded 156 adults, including A. costalis, 

 C. fatigans and M. africanus, but not a single specimen of S. fasciatu. 

 As the occurrence of this mosquito in houses in large nambers has 

 repeatedly been recorded by others and one of the authors has often 

 taken it in European bungalows in the Gold Coast, usually in the 

 afternoon between 3 and 6 p.m., and not at night, a probable explana- 

 tion is that S. fasciata, Avhilst entering houses to obtain a feed of blood, 

 <loes not roost indoors. 



(C337) a2 



