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NEW YORK STATE MUSEUM 



condition in that the 

 antennae are com- 

 posed of 15 nearly 

 equal segments, each 

 presenting approxi- 

 mately the same char- 

 acteristics as the 

 other groups. The 

 segments of the male 

 antennae are thickly 

 plumose. approxi- 

 mately equal. They 

 differ from those of 

 the other groups in 

 that the plumes all 

 rise from the thick 

 basal whorl on seg- 

 ments 2 to 14 inclu- 

 sive, a sparse basal 

 whorl somewhat like 

 that of the female 

 occurring at the base 

 of the 15th segment. 



The palpi consist of 

 five segments in both 

 sexes of most Culi- 

 cidae, except in the females of certain Culicinae, where the rudi- 

 mentary fifth appears to be wanting, and in some Aedeomyinae 

 where there has been an even greater consolidation of segments. 

 These organs are approximately equally developed in both sexes 

 of the Corethrinae, the first and second segments usually being 

 fused, the others distinct and subequal. The Culicinae present 

 striking differences between the sexes. The palpi of the female hav- 

 ing the first and second segments nearly fused, the divisions being 

 indicated only by slight constrictions and usually the partial absence 

 of chitin. The third and fourth segments are well developed, 

 subequal, and the fifth is rudimentary and, in some species, absent. 

 The males have the first and second segments almost completely 

 fused as in the case of the female ; the third is enormously produced 

 with a pseudoarticulation near its middle, while the fourth and 

 fifth are well developed, subequal. 



Fig. 2 Corethrella brakeleyi, male and female 

 antennae, much enlarged (Original) 



