44 
A Monograph of Culicidae. 
The male differs from G. serratus in that the claspers are steel 
black instead of yellowish-brown, as well as in the thoracic 
ornamentation, &c. 
Habitat .—Jamaica (F. Cundall and Dr. Grabham) (7. 12. 
1899); Rio de Janeiro) (Moreira) (9.12. 1899); New Amsterdam 
(Rowland) (61); Buenos Ayres (Arribalzaga); Brazil (Dr. Lutz). 
Time of capture. —July, and again in November in Brazil; 
February in British Guiana. 
Observations .—The Jamaican specimens differ from the others 
only in a few points, namely, the thorax is more silky white in 
front; the posterior cross-vein is distant about its own length 
from the mid cross-vein, and the abdomen has a median line of 
ochraceous scales along its whole length in a few cases, expanding 
out so as to cover the whole of the last segment, and the venter 
is entirely creamy scaled. Dr. Lutz says the species occurs on 
the borders of overflowing streams and swamps, and stings in the 
daytime. 
Dr. Grabham bred the species from larvae collected in stag¬ 
nant algae-containing permanent pools at Ferry and Rockfort, 
Castries ; he says, “ Both males and females live on banana slices. 
The female alone sucks blood. The larval stage lasted in 
aquarium exposed to sun about eight days, the pupal stage thirty- 
six to forty-eight days. Imago emerges generally between five 
and seven p.m. This species appears to be active only during 
the night ” (Grabham). Dr. Rowland’s specimens were taken on 
drained land and in houses. I think this insect is Arribalzaga’s 
species, 0. conjirmatus, but there is no basal silky white banding 
in any of the specimens, and the first sub-marginal cell is longer 
and narrower than the second posterior cell. It answers in so 
many respects, and seems such a widely-spread insect in 
S. America and the West Indies, that I do not consider these 
differences as more than local variations. The specimens received 
show it to be subject to some variation both in colour and in the 
position of the posterior cross-vein. The Brazilian specimens 
agree with the West Indian. 
The specimens examined have the fork-cells of slightly 
unequal length, not of equal length, but the other characters 
given by Arribalzaga as of generic importance for the genus 
Ochlerotatus hold good, namely, the small apical joint of the palpi 
and the $ and 9 ungues. But as the closely related C. gelidus , 
mihi, does not answer to these points,‘and as several other very 
diverse species do, I am forced to neglect Arribalzaga’s genus. 
