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 antenne of the males are usually as in the typical Culex males ; 
in Culiseta inornatus, however, the male antenne 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 antenne do not present the usual plumose appearance. Thus it will be 
seen that considerable differences in the character of the male antenne may 
occur within a genus. 
Another striking example of such difference occurs in the genus Uranotenia, 
where they are usually distinctly plumose in the male. In U. lowi, however, the 
male antennz closely resemble those of the female. In the males of U. sap- 
phirina and U. geometrica, with distinctly plumose antennz, 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 
antenne, while distinctly plumose, approach in structure those of the female. In 
U. lowti the male antennz are like those of the female. The joints of the shaft 
are long, cylindrical, and very coarsely hairy; 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 antenne, 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- 
tenn 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 
