65
NYSSORHYNCHUS JAMESI.
Adult characters.—This is rather a small mosquito» Usually it is rather
blackish in colour, but it may sometimes be found of a lighter grey or brown
appearance. It has a pecular habit when at rest of waving its white tipped
hind legs about in the air. It possesses three rather narrow white bands on its
palpi, the terminal one being the widest. The dorsal aspect of the thorax is grey-
owing to the presence of white scales, the lateral and ventral aspects are dark.
The abdomen is dark in colour. The wings are spotted with black and white
and the legs are thickly speckled with white except the last three segments of
the hind tarsi which are snow white. Examination with a microscope shows
numerous short broad white scales and dark hairs on the thorax, and dark
scales on the last two or three segments of the abdomen. The rest of the abdo-
men is covered with brown hairs. The characteristic markings are the speckling
of the legs and the white hind tarsi.
Larval characters.—The larvæare usually of a reddish brown colour and
present rather a hairy appearance. The frontal hairs possess numerous lateral
branches. The palmate hairs are large and are present on the second to the
seventh abdominal segments ; the terminal filament is rather short.
Ovum.—The upper surface is rather narrow. The floats are rather short
and oval and are placed far forwards, the fringe is fairly developed but it is not
continued over the floats.
148.
Nyssorhynchus Fuliginosus.
This mosquito, which has only once been found in Bombay, resembles Nyssor-
hynchus jamesi very closely, the only marked difference being in the fact that its
legs are not speckled with white as are those of Nyssorhynchus jamesi. In every
other particular it is the same ; and the larvae and ova also are almost identical
with those of Nyssorhynchus jamesi.
149.
MYZOMYIA.
Generic characters.
Abdomen.—Only the last segment carries scales.
Thorax.—With hairs and sharp-pointed curve scales.
Prothoracic lobes,—With a conspicuous tuft of true scales.
Upright forked cephalic scales.—Of the usual type but forming tufts at the
postero-lateral angles.
Wing scales.—Not characteristic.
Myzomyia Listoni.
Adult characters,—This is an exceedingly small mosquito of very fragile
appearance, with very delicate slender legs. It is usually of a dark grey or
blackish colour with wings spotted with white. The palpi have three almost
equal white bands, the outermost extending to the tip. The proboscis is black
with a yellowish tip. The head is covered with dark brown and white upright
scales and there is a frontal tuft of hairs. The thorax is covered with white
scales on a dark ground. The abdomen is of a dark black colour with many
yellowish hairs. The wing costa is marked by four white areas, the smallest
near the apex.
It is generally stated that a characteristic feature of the wing markings of
Myzomyia listoni is the white scaled 3rd longitudinal vein ; but in the variety
present in Bombay this vein is black scaled, like that of M. culicifacies.
The legs are generally dark, almost black in colour, but occasionally slightly paler
areas are present near the joints. Major S. P. James, I.M.S., has mentioned as
characteristic features distinguishing If, listoni from M. culicifacies the fact
that the 1st fork cell of the wing is more than 11/2 times the length of the 2nd
fork cell, and that there are 5 pale areas on the wing fringe.
B 136—17