Genus Culex. 
151 
scales are very minute curved thin structures, whereas in C. fati- 
gans they are broader and much larger. 
Arribalzaga describes the antennae as being dull yellow; 
those I have seen have them brown, and the basal bands, he says, 
are clothed with white scales ; the Amazonian specimens have 
the scales pallid yellow. Giles says the type in the Jardin des 
Plantes has the supernumerary and mid cross-veins in one line ; 
I have frequently seen the cross-vein look thus in this species 
when held in a certain position, but in no case do the stems of 
the fork-cells equal one another. I have seen no species from 
South America in which they do. 
In the $, which I have not seen, Arribalzaga says the 
ungues are all simple. 
The Amazonian species only measures 4 mm. ; Arribalzaga 
says 4 to 6 mm. 
Regarding this species, Arribalzaga says “it is just like 
C. pipiens, and it is also closely related to C. pallipes of Macquart, 
and that of Meigen. It does not differ superficially from the 
type of my genus Heteronycha (dolosa ), but a short examination 
of the ungues enables one to recognise not only its specific but 
generic status, the ungues being small and simple in both sexes.” 
The Culex jlavipes is found in large towns and inhabited places. 
The female, when caught, has the abdomen full of blood, and it 
turns violet-black when dry. 
120. Culex fatigans. Wiedemann (1828), 
Culex aestuans. Wiedemann (1828). 
Culex pungens. Wiedemann (1828) (?). 
Culex pallipes. Meigen (1838). 
Heteronycha dolosa. Arribalzaga (1896). 
(Auss. Zweifiiig. Ins. p. 10, Wiedemann; Hd.Bk. Mosq. p. 299, Giles; Syst. 
Besclir. Siebenter Tli. oder Supple. (1838) { = pallipes), Meigen; Dipt. 
Argent, p. 56 (= H. dolosa), Arribalzaga; Auss. Zweifliig. Ins. p. 9 
( = pungens ), Wiedemann; Bull. 25th N. Se. U. S. Dept. Agri. p. 22, &c. 
(1900) (= pungens), Howard.) 
(Figs. 114 and 115, PI, XXIX.) 
Thorax brown, with two distinct dark lines on the denuded 
surface, covered with pale golden curved scales and with two 
more or less distinct bare parallel. dark lines, and three rows 
of dark bristles, ornamentation variable. Abdomen dark brown 
to black, with basal white or pale creamy curved bands and 
