1932 ] 
A New Culex from Panama 
81 
ing downwards to form another elevated portion about 
three-fifths of its greatest height, then curving abruptly 
down to the distal end of its attachment to the appendage, 
which is at about two-thirds the length of this appendage. 
The membrane is an expansion of the dorsal border of the 
appendage. The appendage, with its membranous expan- 
sion, resembles a plough, the heavily chitinized tip forming 
the share, and the membranous expansion forming the 
mouldboard. As this is the most prominent and striking 
feature of the terminalia, I have named the species from 
this structure. 
The inner division of the lobe of the side-piece is un- 
divided, and bears two hooked filaments curved inwards 
(ventrally) at an obtuse angle. The more distal filament 
is somewhat longer than the other filament, and is sinuously 
curved, terminating in an expanded blunt tip. The shorter 
filament is sinuously curved, following the curve of the dis- 
tal filament, and terminates in a rather sharper recurved 
tip. At the base of the inner division of the lobe are two or 
three setae arising from conically produced bases. 
The clasper is membranous, not much expanded, with 
pointed tip and appendiculate spine. A small spine arises 
from a protuberance on the inner aspect of the clasper, 
about one-fifth the distance from tip to base. The outer 
edge of the clasper is membranous, with rough torn irreg- 
ular free margin. Two strong setae about one-third the 
length of the clasper, arise from the angle between the 
clasper and the base of the outer lobe of the side-piece. 
The ninth tergites are small, mound-like, rather heavily 
sclerotized, and are joined by a smooth bar about as long as 
the width of one of the tergites. The tips of the tergites are 
smooth, but the bases are clothed with long stiff setae aris- 
ing from protuberant bases. 
The inner plates of the mesosome are T-shaped, the ends 
of the cross-pin of the T being produced to form sharp 
horn-like tips, which are directed mesially. The dorsal tip 
of the T is longer, thinner, and sharper than the ventral tip. 
The basal hooks are rather wide and membranous. 
The tenth sternites are rather short, with seven or eight 
blunt teeth, which are long in proportion to the length of 
the entire sternite. 
