. Bulletin of entomological research. Entomology. EARLY STAGES OF WEST AFRICAN MOSQUITOS. 65 Cutex ager, Giles, var. ethiopicus, Edw. Larva.—The larva of this mosquito has been figured by Edwards (loc. cit., p. 380) and has been included by him in his " Revised Keys to the Known Larvae of African ; One feature, however, which is not referred to by him and which is not shown in the figures, may be mentioned because it is unusual, that is, the shape of the mental plate. In the larva of C. ager var. ethiopicus this structure is shaped like an equilateral triangle, and its marg
. Bulletin of entomological research. Entomology. EARLY STAGES OF WEST AFRICAN MOSQUITOS. 65 Cutex ager, Giles, var. ethiopicus, Edw. Larva.—The larva of this mosquito has been figured by Edwards (loc. cit., p. 380) and has been included by him in his " Revised Keys to the Known Larvae of African ; One feature, however, which is not referred to by him and which is not shown in the figures, may be mentioned because it is unusual, that is, the shape of the mental plate. In the larva of C. ager var. ethiopicus this structure is shaped like an equilateral triangle, and its margin when viewed at a moderate magnification (1/6 objective and No. 3 ocular) appears to be crenated but devoid of teeth (fig. 5, a); when examined with higher powers, however, the crenated margin is seen to be composed of a large number (about 60) of minute teeth, which increase in size slightly as they recede from the Pig. 5. Pupa of Culex ager var. ethiopicus, Edw.; a, mental plate of larva. Pupa (fig. 5).—The pupa is large, measuring about 6 mm. when extended, and well chitinised, the sockets of the hairs, even minute ones, being marked by a thick- ened darkened ring. The paddles are infuscated. The trumpets have wide apertures, which are directed anteriorly in the living pupa. The paddles, which are nearly 1 mm. long, are broad, the ratio of length to greatest breadth being about 11 to 1 ; they are supported by an external buttress and a well developed midrib. Near the distal end of the midrib are two minute hairs, the one considerably larger than the other; the larger hair is sometimes divided towards its tip. The paddle is infuscated at its distal end and over almost the whole of the inner lobe, and has no fringe. At the posterior angle of the 8th abdominal segment is a tuft of 5 to 7 subplumose hairs, which are usually branched. This tuft is about one-quarter the length of the paddle. (C572) E. Please note that these images are extracted from scanned page image
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