196 
Determine the number of segments which carry 
distinct and large palmate hairs and those carrying ill- 
developed ones. 
1. Fully developed hairs occur on all segments 
(one to seven) and on the thorax. 
P. jeyporensis 
M . listoni 
M. culicifacies 
2. Fully developed hairs on the second to 
seventh, or third to seventh segments. Rudimentary 
hairs on the second or even first abdominal segments 
and on the thorax. 
N. stephensi 
N. maculatus 
N. theobaldi 
3. Palmate hairs confined to the third, fourth, 
fifth, sixth, and seventh segments. 
M. sinensis 
M. barbirostris 
A. maculipennis (Nuttalland Shipley) 
4. Palmate hairs confined to the fourth, fifth, 
and sixth segments. 
M, turkhudi 
9. The Leaflets. —In the well-grown larva each 
palmate hair consists, as a rule, of nineteen or twenty 
leaflets arising close together from a short stalk, and 
forming a semi-circular fan (Fig. 66). When collapsed, 
as is the case when the larva is beneath the surface, 
these hairs are inconspicuous. When, however, the 
larva takes up its characteristic attitude at the surface 
of the water, these spread out fan-like, and are very 
striking objects under the microscope. 
In the mature larva the leaflets shew much vari¬ 
ation in the different species. In most species, the 
