140 
A Monograph of Culicidae. 
114. Culex nigritulus. Zetterstedt. 
(Dipt. Scandinaviae, t. ix. (1850).) 
Thorax dark brown, with thin golden-brown curved scales, 
paler on each side of the scutellum. Abdomen dusky brown, 
with indistinct pale basal bands, widest in the middle, sometimes 
dull white, at others, when worn, cinereous; venter dusky, with 
narrow faint pale basal bands. Legs brown, coxae, bases and 
venter of femora pallid; ungues of $ equal and simple; of 
the $ the fore and mid ungues are unequal, uniserrated ; the 
hind ones equal and simple. A small delicate species 3 * 5 to 
4 mm. long. 
9 . Head dark brown, with pale golden curved scales and a 
pale clear border round the eyes ; flat whitish scales at the sides 
of the head ; black upright forked scales 
before the white lateral patches and 
brown ones behind; eyes purplish- 
black ; antennae blackish-brown, basal 
joint bright ferruginous, but dark on 
the inner side, the base of the second 
joint also ferruginous; palpi dark 
brown; proboscis covered with brown 
scales, darker towards the apex. 
Thorax dark brown, with scattered 
thin golden-brown curved scales, rather 
paler on each side of the bare patch in 
front of the scutellum, bristles black; 
scutellum brown, with pale curved scales and black border- 
bristles, seven to the mid lobe; metanotum dull chestnut- 
brown ; pleurae pallid, with a few white scales. 
Abdomen dusky-brown, with indistinct basal dull whitish 
flaxen bands, which are widest in the middle, especially in the 
apical segments ; when viewed under the microscope the abdomen 
appears ochraceous-brown and the dusky scales become dull violet; 
venter dusky-brown, with narrow faint basal bands. 
Legs brown, coxae pale, also the bases and under-sides of the 
femora; a faint yellow knee spot and another at the end of 
the tibiae; metatarsi and tarsi darker brown, the whole with 
sometimes a bronzy ochraceous tinge; ungues equal, small and 
simple. 
Fig. 226. 
Culex nigritulus, Zett. 
Fore and hind ungues of the d", 
and head. 
