posterior cross-vein about twice its own length distant from 
the mid cross-vein. 
Halteres with pale ochraceous stem and fuscous knob and 
part of the stem. 
Length. — 2 to 3 mm. 
Habitat. —Itacoatiara, Lower Amazon (Austen) (96, 80). 
Time of capture. —February. 
Observations. —A small black species very like Ac. Butleri, 
mihi, but differing from it in two respects :— 
(i) The fork-cells are relatively very much longer than in 
Ae. Butleii , in which the stem of the first sub-marginal cell is 
more than half the length of the cell, whereas in this species the 
stem is short; 
(ii) There are numerous upright forked scales on the head, 
which do not appear to exist in Ae. Butleri. 
Unless these two characters are looked for the species may 
easily be confounded, in spite of their widely separate habitats. 
5. Aedes cinereus. Meigen (1818). 
Ae. rvfus. Gimmertlial (?) (1845). 
(Syst. Beschr. Europ. ZweiflugeJ. Insekt. i. 13, Meigen; Ins. Brit Dipt. iii. 
Walker; Dipt. Scand. Zetlerstedt; Fn. Austr. i. Schiner; Bull. Soc. 
Ent. Ital. (1890), p. 300, Ficalbi.) 
(Fig. 96, PI. XXIV.) 
Thorax blackish-brown, with a faint median line with narrow 
curved golden scales. Abdomen black, with black scales, and 
with dull grey lateral ones, apical segment with white scales on 
each side at the base. Legs deep brown, with bronzy reflections, 
joints slightly testaceous. Ungues of fore and mid legs of $ 
unequal, the larger uniserrated, the smaller simple; hind 
ungues equal, simple, nearly straight. 
£. Head dark brown, covered with flat dusky ochraceous 
scales in front, some narrow ones behind, and black bristles pro¬ 
jecting forwards ; clypeus deep black ; antennae banded grey and 
dark brown, basal joint large and rotund, deep shiny black, ver- 
ticillate hairs dark brown ; palpi very short, covered with black 
scales ; proboscis very dark brown, becoming jet-black towards 
the apex. 
