54 MOSQUITOES OF NORTH AMERICA 



In certain species of the genus Culex a similar reduction of the male palpi 

 is found. In Culex latisquama the palpi of the male are about half as long as 

 the proboscis. The reduction is in the apical portion; the apical joint is sub- 

 globose, the one supporting it is less than three times its own diameter in length. 

 In the female of this species the palpi are about one-fourth the length of the 

 proboscis, but, as in the male, have a minute terminal joint. In Culex hisitl- 

 catus the palpi are slightly less than half the length of the proboscis in both 

 sexes. In the female there is a single true joint, which makes up more than 

 half the length of the entire palpus. In the male we have been unable to dis- 

 cover any differentiated joint except the minute terminal one. 



In Uranotcenia reduction has gone to the extreme. In both sexes of U. sap- 

 fliirinus the palpi are very small, projecting but slightly beyond the clypeus, 

 club-shaped and unjointed. 



In the females of most Culicini the palpi are short, although differing much 

 in length and configuration in the different species. They consist of a basal 

 portion, which in most cases shows a triple false-jointing; beyond this there is a 

 stout joint and in many species this bears at its apex another minute joint. 

 Sometimes there is even what appears to be a second minute joint, inserted upon 

 the other, but this is with little doubt produced by constriction of a single joint. 

 Such a condition exists in Mansonia fasciolatus, as has already been indicated 

 by JSTeveu-Lemaire. It may also occur as an abnormality, as in the case of a 

 female Culiseta annulata figured by Dye and Neveu-Lemaire. In the species in 

 which the minute terminal joint is usually absent specimens may occur with this 

 joint present. Dye and Neveu-Lemaire describe such palpi in a female Culex 

 pipiens. We have a Culex tarsalis with the same abnormality. 



In Deinocerites and Dinomimetes the palpi are short in both sexes, but show 

 considerable diversity of structure in the different species. In Deinocerites 

 pseudes female there is a distinct terminal joint, more than half the length of 

 the entire palpus. In the male of this species there is in addition a minute apical 

 joint. The palpi of the male D. troglodytus are similar but the apical joint is 

 still more minute, while in the female there is no distinct jointing. The palpi 

 of D. cancer are unjointed in both sexes. In Dinomimetes epitedeus there is a 

 single joint in both sexes. 



In the group of Sabethini the reduction of the palpi is far more general and in 

 most species these organs are short and unjointed in both sexes. In the forms 

 examined the female palpi always proved unjointed, and although only a few 

 forms have been studied it is evident that such is the rule in this group. In 

 Johlotia digitatus the palpi are long and slender in the male, distinctly jointed; 

 in the female the palpi are short and unjointed. In Lesticocampa the palpi are 

 very slender. They may be long or short in the male, according to the species, 

 but they are jointed like those of the male Johlotia. The palpi of the female, 

 as in other sabethids, are unjointed. 



