THE PUPAE OF WEST AFRICAN MOSQUITOS. 



77 



the same distance, namely to the termination of the seta itself, so that the branches 

 coming off near the base are relatively long, while the others diminish in length 

 progressively towards the apex — the appearance produced being suggestive of 

 a harp. 



There are short single stout setae with pointed ends at the posterior' angles of 

 all the segments proximal to the 8th, except the 1st. These setae gradually increase 

 in size as the posterior end is approached. On the dorsal surface and at the posterior 

 border of the segments immediately internal to the seta at the posterior angle there 

 is a tuft of simple hairs on the 3rd to the 6th segments ; on the 7th segment this 

 tuft is replaced by a single or double hair. On each side nearer the middle of the 

 dorsum on the posterior border of the 6th and 7th segments is a single or double 

 stout hair extending slightly beyond the middle of the segment over which it 

 projects ; on the posterior border of the 3rd, 4th, and 5th segments this single 

 hair is replaced by a tuft. The trumpets have wide apertures, which are fluted. 



Fig. 2. Anophehs mauritianus, Grp. 



With such a small amount of material it is scarcely worth while making out a 

 table for identification, especially as there is no difficulty in separating the pupae, 

 but a few of the many points of distinction may be briefly mentioned. 



The buttress on the outer margin of the paddle is conspicuous in A. costalis, less 

 well developed in A. pharoensis, and in A. mauritianus, as Wesche states, it is less 

 well marked than in A. pharoensis. In A. marshalli it is only slightly developed. 

 Unfortunately Bacot' s figures do not show the buttress in either A. costalis or 

 A. funestus. 



The longer terminal seta on the paddle is " reminiscent of a boot-hook " in 

 A. costalis and A. funestus, according to Bacot ; in A. marshalli it is gently curved ; 

 in A. pharoensis it is almost straight, and in A. mauritianus it is usually bifid. 



The dendritic setae on the posterior angles of the 8th abdominal segment also 

 differ in these species. In A. funestus they are " larger, with less spread of the 

 branches " than in A. costalis, according to Bacot. In A. marshalli they are 

 smaller than in A. costalis, their length as compared with the length of the paddle 

 being as 7 to 35 in the former, and as 12 to 36 in the latter. In A. mauritianus they 

 are harp-shaped. 



