THE EARLY STAGES OF WEST AFRICAN MOSQUITOS. 



Ill 



Ventral Abdominal Setae. 



The setae present on each segment, as well as the characters of the setae, are sho\vn 

 in the following tabular statement (Table IV). 



Table IV. 

 A Comparison of the Ventral Abdominal Setae of the Pupae ofC. decens and C. invidiosiis. 



Seg- 





Seta. 



G. decens. 



C. invidiosus. 



ment. 











III. 



D 



; very small, feebly chitinised . . 



1 



1 





E 



; small tuft, longer than E' 



Small tuft, 4-5 hairs 



Small tuft, 2-5 hairs 





E' 



; small tuft 



Small tuft, 2-5 hairs 



Small tuft, 4-5 hairs 





C 



; moderate length 



2 



2 





B' 



; small 









A 



; minute 







IV. 



D 



; very small, feebly chitinised 









E 



; small tuft. . 



1, or small tuft, 2-5 

 hairs. 



Small tuft, 2-4 hairs 





E' 



; small tuft, longer than E 



1, or small tuft, 2-6 

 hairs. 



1, or small tuft, 2-t 

 hairs. 





C 



; moderate length 





2 





B' 



; small 









A 



; minute 







V. 



D 



; very small, feebly chitinised 









E 



; small tuft 



1 , or small tuft, 2-4 

 hairs. 



Small tuft, 2-4 hairs 





E' 



; small tuft, longer than E 



Small tuft, 2-5 hairs 



Small tuft, 4-7 hairs 





C 



; rather long, reaching fully half 

 way across the sixth segment . . 









B' 



; small 





1, end sometimes 

 forked. 





A 



; minute 







VI. 



D 



; very small, feebly chitinised . . 









E 



; small 



1, or small tuft, 2-4 

 hairs. 



1, or small tuft, 2-3 

 hairs. 





C 



; rather long, reaching fully half 

 way across the seventh segment 









B 



; rather long, shorter than C 









B' 



; small 



1-2, usually 1 



1-2, usually 1 





A 



; minute 







VII. 



E 



C 



; small tuft 



; rather long, reaching fully half 

 way across the eighth segment . 



Small tuft, 2-4 hairs 



Small tuft, 2-4 hairs 





B 



; moderate length 









B' 



; small, end sometimes forked or 

 sub -divided, a little external 











and anterior to B 



1-2 



1-4, usually 1 





A 



; minute 







YIII. 



A' 



; minute 



1 



1 



The setae on the ventral aspect of the abdomen are few, and mostly inconspicuous. 

 The following setae, which form series, may be recognised on each side of the abdomen 

 of either pupa on two or more of the segments : — 



1. — A small seta, the medio-lateral seta (E), a httle internal to the lateral border and 

 rather posterior (junction of the posterior and middle thirds) to the middle of the 

 segment. 

 (687) B 



