I 9 2 
or one-sixth objective : the following points can be 
readily made out. Observe that old larvae are often 
almost totally enveloped in Vorticella or other In¬ 
fusoria. 
1. The Head. —The head is globular in shape, 
and is for the most part enclosed in a hard and con¬ 
tinuous chitinous case. Anteriorly, there are the 
rather complicated mouth parts. Posteriorly, there is 
an opening into which the neck is inserted, around this 
is a pigmented border resembling a collar. There is 
a gap in this dark border in the middle line posteriorly, 
and here two diverging bands of chitin form a ‘ V ’ on 
the back of the head. Grouped around this 1 V 5 mark 
are more or less continuous patches of pigment, which 
shew differences in their arrangement, to seme extent, 
specific. 
2. The Antennae. —Arise from two prominent 
lateral protrusions, they are freely movable at their 
articulation. Each antenna is a rod-shaped unjointed 
body. At its termination are two leaf-shaped bodies, 
and a branched hair arises between the leaflets. The 
antenna is covered with small spines, which are 
particularly developed in pairs along the inner border. 
In most species of Anophelines a hair can be made out 
arising from a papilla situated at the junction of the 
proximal and middle third of the antenna. 
This hair is of specific importance. 
(i) In the majority of Anopheline r it is simple 
and unbranched. 
(ii) In A. lindesayi , M. ?iigerrimus , M. bar- 
birostris it is branched, and in the last two very large 
and conspicuous (Fig. 63). 
3. The Eye. —In the full-grown larva a crescentic 
compound eye is seen on either side, and behind this 
a single pigment mass (simple eye). 
