ANTENNZ OF IMAGO 27 
times densely clothed with scales, as in Megarhinus and Aédeomyia. The shape 
and proportion of the joints differs considerably in different genera. Thus in 
Aédeomyia the joints are very short and stout, the second joint of the shaft 
hardly longer than broad; the succeeding ten joints are subequal, hardly twice 
as long as thick. The opposite extreme is reached in Deinocerites, where the 
joints of the shaft are slender and very long. 
In a majority of the species the antennx of the male are plumose; that is, the 
joints of the shaft are shortened, bringing the whorls of hairs close together, and 
the whorls themselves are composed of longer and much more numerous hairs. 
The torus, as already mentioned, is larger in the male, and this contrast is 
greatest in the forms in which the male antennz are differentiated most. In the 
typical plumose antenna the whorls of the first eleven segments of the shaft are 
subapical, the basal one bearing a whorl as well as the others. The last two 
joints are very long and slender and bear basal whorls of hairs. On all but the 
last the slender segment is greatly expanded at the insertion of the whorl in 
order to accommodate the numerous, closely crowded hairs; the whorl does not 
form a complete circle, but there is a very slight interruption on the outer side. 
The first joint of the shaft is much longer than the succeeding ones and it bears 
coarse hairs upon the part below the whorl. The short segments, aside from the 
whorl, are smooth or nearly so; sometimes very small hairs are present upon the 
very short chitinous ring just above the whorl. The two last very long joints are 
densely hairy beyond the whorl, the hairs of the penultimate joint are particu- 
larly long and thus complete the plumose effect. The last joint is pointed at the 
tip, its whorl contains fewer hairs and they are inserted as in the female. 
Raphaél Blanchard, in Les Moustiques, pages 45 and 47, states that the 
antenna of the female has fourteen joints, that of the male fifteen, following 
Ficalbi in this respect. In fact, the number of segments is the same in both 
sexes. Ficalbi’s error occurs, as one can readily see by his figure, with the first 
joint of the shaft of the male antenna; the parts above and below the whorl are 
regarded as separate segments. This was done, apparently, in the attempt to 
homologize the antennz of the two sexes and, as the third antennal joint of the 
female bears no whorl, it was natural to consider the basal part of the same seg- 
ment of the male as a unit, and the part beyond, with the whorl at its base, as 
a separate segment. 
Many modifications occur in the different genera and species. In the male of 
Megarhinus the antenna is remarkably stout and rigid; the first joint of the 
shaft is unusually long and very stout, clothed with numerous coarse hairs and 
a dense covering of scales; the whorl is apical. In the succeeding ten joints the 
whorls are much nearer base than apex, and the apical part of the joints is dis- 
tinctly hairy. 
In Culex latisquama the antenne of the male are remarkably long, nearly 
equaling the considerably lengthened antennex of the female. They are of the 
usual plumose plan but there is a lengthening of all the joints; even the two 
terminal joints are longer than in the ordinary type and the last joint is the 
longest ; the ten shorter subequal joints are from three to four times as long as 
