84 A. INGRAM AND J. W. SCOTT MACFIE. 



3. Infuscated spot on the paddles . . . . . . . . C. quasigelidus. 



No such spot . . . . . . . . . . . . . . . . 4 



4. A triple hair at the posterior angle of the 5th and 6th 



segments . . . . . . . . . . . . . . . . C. thalassius. 



A tuft of five or six hairs at the posterior angle of the 5th 

 and 6th segments . . 



C. tritaeniorhynchus. 



70 



C. tigripes var. fuscics. 



6 



19 



C. fatigans. 



5. Large species ; length of the paddle about 0*9 mm. 



units) 

 Small or medium-sized species 



6. Stout pupa, well chitinised ; tubal aperture large 



units to a trumpet length of 42 units) 

 Slender pupa, poorly chitinised ; tubal aperture smaller 



(10 units to a trumpet length of 35 units) . . . . . . C. invidiosus. 



7. Tuft on the 8th segment long, more than half the length 



of the paddle (19 to 34) ; trumpets short . . Cyathomyia fusca. 



Tuft on the 8th segment shorter, less than half the length 

 of the paddle (8 : 42) ; a pair of long hairs on the 

 distal margin of the 6th segment ; trumpets larger . . . . C. guiarti. 



In drawing up this table it has been necessary to take into account certain minute 

 characters which unfortunately has made it impossible to include some of the species 

 described and figured by Wesche in insufficient detail. It has also been necessary to 

 re- describe C. fatigans and C. invidiosus in order to bring out these points. The 

 branched or subplumose character of the hairs composing the tufts at the posterior 

 angles of the 7th and 8th segments is not a very satisfactory differential feature and 

 has been adopted in the table only because it was employed by Wesche. Four of the 

 species have not previously been described. 



It may be noted as a point of possibly generic importance that none of the species 

 of Culex that we* have examined has had a fringe on the pupal paddles. 



Culex fatigans, Wied. (fig. 7). 



The pupa is stout and well chitinised. The paddles are large and slightly pyrif orm, 

 with a well developed midrib and a slight thickening of the external border, but without 

 a fringe. At the distal end of the midrib there are two small setae situated close 

 together, the one being rather longer than the other. At the posterior angle of the 

 8th segment there is a tuft of about 6 to 8 branched hairs. At the posterior angle of 

 the 7th segment there is a group of three setae ; the one nearest the angle is a small 

 tuft of 4 or 5 delicate hairs, just above it is a larger tuft of 3 to 5 stout hairs, which are 

 usually subplumose but may be branched, and internal to this seta and a little above 

 it is a small double or triple hair. Several other hairs are situated along the posterior 

 margin of this segment, most of which are small and double, but one particularly 

 long single hair may be found near the angle. The 6th segment bears just above its 

 posterior angle a long delicate triple hair, on the posterior margin a little internal to 

 the angle a very long double hair, and just internal to this a tuft of 4 hairs. Similar 

 setae occur on the 5th segment, but the tuft internal to the angle is composed of rather 

 more hairs, 5 usually. On the 4th segment the long lateral seta is sometimes double, 



