243 WEST AFRICAN CERATOPOGONINAE PART II A. INGRAM AND J. W. S. MACFIE {Received for publication 2S June, ig22) The majorjt)' of the species described in this paper were collected at or near Accra, in the Gold Coast. A few, however, were sent to us from Nigeria, and for these we have to thank Dr. E. C. Braithwaite, of Calabar, and, once again. Dr. H. Andrew Foy, of Lagos. With regard to the species which in this and our previous papers we have assigned to the Genus Atricho-pogon, it should be noted that the eyes are not bare. In his paper on the ' Chironomidae of America' (1917), Kieffer associated his Genus Kempia with Atrichopogon, separting it by the pubescence of the eyes. Later (1921), in a brief note, the same author erected the new Genus Gymnohelea, the characters of which also agree with those of Airicfio-pogon excepting that the eyes are pubescent. Kieffer appears therefore, to recognise two genera (Kempia and Gymnohelea) closely allied to Atrichopogon but differing from it in having the eyes pubescent, but he has not stated what are the differences between them, nor indeed, so far as we can ascertain, has he fuUy detailed the generic characters of either. In the species which we have described, we have found every gradation between those in which the eyes are practically bare and those in which they are densely hairy. In the former, the pubescence may be restricted to the anterior margins of the middle thirds of the eyes and may be visible clearly only after treatment with caustic potash, so that it might be overlooked (as was done by us in some cases) unless, by rolling the specimen from side to side as is possible by our carbolic
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