112 J. W. S. MACFIE AND A. INGRAM. 



2. — ^A very small seta, tlie postero-lateral seta (D), in a lateral position just above 

 the posterior angle. 



3. — ^A small seta (E') a little posterior and external to E. 



4. — ^The seta belonging to the inner ventral row (B). 



5. — The seta belonging to the outer ventral row (C). 



6. — ^A small seta (B') near the posterior margin of the segment a Httle internal to C- 



7. — ^A very minute seta, the anterior ventro- central seta (A), at the anterior margin 

 of the segment and very close to the middle hne of the abdomen. 



Two setae require special mention. On the eighth segment there is a minute seta 

 (A') near the anterior margin of the segment a httle internal to the level of B on the 

 seventh segment. This seta resembles A, but is placed more externally and pos- 

 teriorly than A on the more anterior segments. On the seventh segment the small 

 seta internal to C is situated close by and a httle anterior to B ; we have therefore 

 marked it B', and have retained this symbol for the similar setae on the more anterior 

 segments which, however, are situated nearer the posterior margin and more exter- 

 nally. 



It is clear from the descriptions which have just been given that the setae of the 

 pupae of C. decens and C. invidiosus are similar in character and situation, and that 

 although they are somewhat variable as regards their sub-divisions the degrees of 

 variation of the two overlap. In fact, they provide no feature of differential im- 

 portance. 



The question then arises, are C. decens and C, invidiosus separate species or are they 

 varieties of a single mosquito. There are indeed certain differences in the adults, 

 but the genitaha of the males are identical according to Edwards, the larvae cannot 

 be separated, and the same remark apphes to the pupae. Under these circumstances 

 we think there can be httle doubt that they should be regarded as varieties and not 

 as distinct species ; we propose to retain for the species the name C. decens. 



