28 MOSQUITOES OF NORTH AMERICA 



broad and bear the whorl slightly below the middle, the part above the whorl 

 being pubescent. The hairs of the whorls are unusually long. 



In Culiseta the antennae of the males are usually as in the typical Culex males ; 

 in Culiseta inornatus, however, the male antennae approach in character those of 

 Culex latisquama, just described. The subequal joints of the shaft have the 

 part above the whorls lengthened and the hairs of the whorls are less numerous, 

 so the antennae do not present the usual plumose appearance. Thus it will be 

 seen that considerable differences in the character of the male antennae may 

 occur within a genus. 



Another striking example of such difference occurs in the genus TJranotcenia, 

 where they are usually distinctly plumose in the male. In U. lowii, however, the 

 male antennae closely resemble those of the female. In the males of U. sap- 

 phirina and U. geometrica, with distinctly plumose antennae, the joints of the 

 shaft are long and slender ; the whorls are basal and consist of numerous very 

 long hairs and the part beyond the whorl bears many, irregularly inserted, long 

 hairs which give the effect of a secondary whorl; the last two joints are 

 lengthened, but not to the same degree as in the forms first described; these 

 joints are coarsely hairy and the whorl on the last one is represented by a few 

 hairs, inconspicuous among the general pubescence. Thus, in these forms, the 

 antennae, while distinctly plumose, approach in structure those of the female. In 

 U. lowii the male antennae are like those of the female. The joints of the shaft 

 are long, cylindrical, and very coarsely haiiy ; the whorls are basal and consist 

 of a few coarse, moderately long bristles ; the two last joints are not modified in 

 the manner of the plumose type and only the last joint is somewhat lengthened. 



The mosquitoes of the genera Deinocerites and Dinomimetes are remarkable 

 for the very great length of their antennae, those of the male even exceeding 

 those of the female. The joints of the shaft are cylindrical, long and slender, 

 coarsely hairy, with a basal whorl of but few hairs. The first joint of the shaft 

 is always very long and differs from the other joints by lacking the whorl-hairs. 

 In the female of Deinocerites the first joint is three or three and a half times as 

 long as the one following it and at least fourteen times as long as its own diam- 

 eter. The other joints are subequal, each successive one becoming slightly 

 shorter. The antenna of the male Deinocerites closely resembles in character 

 that of the female but is still longer and more slender. The second joint of the 

 shaft is nearly as long as the first and the joints beyond shorter slightly in suc- 

 cession; the last five to seven joints, however, are about equal. The relative 

 proportions of the joints differ with the species. There may be a slight thicken- 

 ing of these last joints, most pronounced in the terminal one, the species differ- 

 ing in this respect. Thus in Deinocerites troglodytus the last seven joints show a 

 thickening, while in D. cancer the last joint only is distinctly swollen. 



In Dinomimetes the female antenna approaches very closely in character that 

 of the male Deinocerites. The first four joints of the shaft are greatly elongated, 

 the second nearly as long as the first, the next two somewhat shorter. The an- 

 tennae of the male Dinomimetes are very similar but lengthened still more. In 

 both these genera the whorls are inconspicuous and consist of few and rather 



