Genus Culex. 
41 
Abdomen covered with deep dusky-brown scales, which show 
rather dull purplish reflections, under the microscope, each 
segment with a median line of yellowish-white scales, which 
spread out somewhat apically, and with a basal patch of pure- 
white scales on each side, which extend along the sides of the 
segments so as to form a more or less jagged lateral white line 
on the last two segments; the yellowish median scales spread 
out so as to form a small apical band ; first segment ochraceous 
brown, with a median patch of white scales and numerous long 
pale hairs, which also border the segments and are also numerous 
laterally ; venter with numerous white scales, very dense apically. 
Legs yellowish-brown, covered with brown and grey scales; 
coxae reddish-brown, with white scales; femora with pale 
yellowish-grey scales beneath, blackish-brown above, with a few 
scattered grey ones ; knee spot white, small ; tibiae the same as 
the femora; tarsi darker, almost black \ ungues of all feet equal, 
uniserrated. 
Wings with the veins brown with brown scales, the lateral 
ones long and narrow; both fork-cells rather short, the first 
sub-marginal narrower and slightly longer than the second 
posterior cell, the stem equal to half its length and about equal 
to the length of the stem of the posterior cell, their bases about 
level; posterior cross-vein the same length as the mid cross-vein 
and about its own length distant from it. 
Halteres with bright ochraceous stems and dusky knobs 
covered with greyish-white scales. 
Length. — 5 to 6 mm. 
$ . Abdomen with the median line formed of more distinct 
obtriangular spots and with more dense woolly hairs on the 
sides ; palpi dark brown with dense fuscous tufts. 
Length .—5 mm. 
Habitat .—Buenos Ayres in Baradero, Chacabuco, Chascomus, 
Chivilcoy, Navarro, Las Heras, Las Conchas, and in the Island 
of Antequera (Arribalzaga); Buenos Ayres and Brazil (Mac- 
quart) ; Buenos Ayres (Bigot ); Misiones (E. L. Holmberg) * 
Chili (Phillipp); Rio de Janeiro and Sao Paulo (Lutz). 
Observations. —Described from two 2 ’ s from Bigot’s collection. 
The type is in the Jardin des Plantes, but the characteristic 
thoracic ornamentation cannot be seen owing to its being 
denuded. This species comes in Arribalzaga’s genus Ochlerotatus, 
but differs so much from 0 . confirmatus that I place it back in 
the old genus Culex with C . confirmatus, Arribalzaga. It is a 
