108 



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



Dorsal Abdominal Setae. 



The setae on the dorsal and lateral aspects of the abdomen may be described 

 together. Details as to the subdivisions of these setae will be found in the tabular 

 statement which follows ; the facts given here are either of a general nature, or 

 such as may be required to make the table comprehensible. 



The following setae, which form series, are recognisable on each side of a typical 

 segment of either pupa : — 



1. — The lateral seta (A), situated a httle above and internal to the posterior angle. 



2. — The seta belonging to the sub-median row (C), on the dorsum, situated near the 

 posterior margin of the segment about half way between the posterior angle and the 

 middle line of the abdomen. This is the row of setae which on a previous occasion 

 (Bull. Ent. Res., x, p. 59) was referred to as the inner lateral row. 



3. — A very small seta (C), situated near the posterior margin of the segment and a 

 little internal to C. 



Fig. 2. Diagram showing the arrangement of the setae on the dorsal and ventral aspects 

 of the pupa of Culex decens or C. invidiosus; dorsal setae shown on the upper, ventral 



setae on the lower half. 



4. — The seta belonging to the sub-lateral row (B) on the dorsum, situated near the 

 posterior margin of the segment about half way between the posterior angle and 

 C. This is the row of setae which on a previous occasion (Bull. Ent. Res., x, p. 59) 

 was referred to as the outer lateral row. 



5. — Two setae (B' and B") situated a little anterior to the posterior margin of the 

 segment ; B' outermost and always more or less external to B, B" internal to B' and 

 on some segments external, on others internal to B. B" is sometimes associated 

 more closely with C than with B, for example on the sixth segment. 



6. — ^A very minute seta, the anterior dorso-central seta (D), near the anterior margin 

 of the segment in hne with the setae of the sub-median row. 



These seven setae are easily recognised on the third to the sixth segments ; the 

 setae on the other segments do not conform completely to this plan and require a 

 few words of explanation. 



Segment I. The setae on this segment are arranged in a similar manner to the 

 corresponding setae of Stegomyia fasciata, and the same names are used in describing 

 them, namely, Dendritic tuft for the large branched seta in the middle of the segment 

 near the median hne, and, for the setae along the proximal border, fiom within 

 outwards, Antero-internal, Antero-external, Medio-internal, Medio-external, Postero- 

 internal, Post ero- external and Lateral. 



