209 
vibrating. Upon releasing the wing, both would vibrate noiselessly 
as before. The noise of the mosquito is due, then, to the vibration 
of its proboscis, and the wing vibration is dependently and 
automatically co-ordinated. 
RELATIVE VALUE OF DIFFERENT FOODS FOR ANOPHELINES 
After trial with bananas, I found that raisins and dates with water 
furnished the best food for Anophelines in confinement. A greater 
number of males and females may be kept alive during the few days 
after emergence if fed with fresh bananas, raisins or dates; but 
females fed on this diet daily would not bite with alacrity. 
Mosquitos fed daily or on alternate days on human blood made better 
dissections after the digestion and evacuation of their meal than those 
fed on bananas. The former would be fairly free from yeast and 
bacteria, and the mid-gut and appendages would not disintegrate so 
rapidly after death. If the mosquitos were fed alternately on bananas 
and blood they would frequently die with an undigested hard mass 
of blood in the mid-gut, which must have been either impossible to 
digest or evacuate. The best method of feeding infected mosquitos 
would seem to be to feed two or three times on a patient favourable 
for infection, and subsequently with raisins, dates and water. Then, 
too, the acid contents of the mid-gut after banana feeding, with its 
fermentation, may interfere with the infection of mosquitos y 
malaria. In Experiments Nos. 20 to 28 a patient having at times 
sixty-seven crescents per one hundred leucocytes in his peripheral 
blood was bitten by four varieties of mosquitos, Ce. albimana , 
Ce. argyrotarsis, A. pseudopunctipennis and Arr. (?) malefactor, 
over a period of thirty-five days. During the intervals between 
biting, however, the mosquitos were fed on bananas, and none 
became infected. 
IDENTIFICATION OF LARVAE 
It must be evident that identification of Anophelme larvae in 
the field is of considerable importance, and in this region the ma a 
transmitting Anophelines can be readily identified y cer ‘ 
anatomical characters. I have made no attempt to eternnne 
