74 
less disturbance is caused, and the more readily are 
larvae removed. 
2. By Dipping .—Choose any water with grassy 
or weedy edges, e.g., the edges of rivers, streams, 
ditches, lake margins, swamps, etc. 
With the least possible disturbance, dip out water 
from the most sheltered positions, and as close to the 
vegetation as possible, bringing up water and weeds in 
the can. Allow the specimen of water to remain a few 
seconds, and remove any larvae or nymphae as they 
appear on the top with the spoon. 
Fig. 26. Larvae of an Anopheline (left) and Culex (right) 
Anopheline larvae should not be mistaken for any 
other mosquito larvae. 
i. When undisturbed they lie flat along the top 
of the water, and on every segment certain hairs 
(palmate hairs) actually indent the surface film. 
Observe that when viewed in certain lights from one 
side these indentations can be plainly seen. The 
appearance may even be as though the dorsum of the 
larvae projected from the water. This, however, 
is not the case. 
