1915] Behavior of Anopheles 237 
A species of night-jars (Fam. Caprimulgide) has been noted 
repeatedly at dusk, flying low over the old French Canal, and 
their actions were those of feeding. This lasted for about an 
hour, and coincided with the period of mosquito flight. These 
activities were also noted during dawn, again when mosquito 
flight was in progress. These night-jars often shifted their 
position along the Canal, and by row-boat observations it was 
found that they were where mosquitos were thickest. A shot 
gun brought down three of these birds and their gullets con- 
tained adults of Anophelenes. The stomachs contained in 
addition ants, hemiptera and a few coleoptera. That these 
birds were feeding upon the mosquitos is undoubted, but the 
effect of their ravages was not significant for there seemed to be 
an infinite source of supply for these mosquitos. Jennings 
(1908) records a similar case in the Bahamas, the species 
involved being Chordetles virginianus minor. 
The blood available to mosquitos at the marsh is only such 
as they can get out of cows, monkeys, birds, lizards, etc., and 
this is not enough. The fact that these mosquitos flew a mile 
or more each night to secure rich, human blood, places man 
among the most important of the biotic factors entering into 
the mosquito environment. Since the winds from the marsh 
have been almost wholly from the north or northwest, and not 
one hour from the southeast, it cannot be argued that the scent 
of man was born to these mosquitos by the wind and all they 
had to do was to follow the trail. These mosquitos flew as an 
air-man does, at a quarter to the wind, and they flew till they 
found food; it is not at all improbable that they would have 
flown five miles if Gatun were so distant. Their flight was in 
quest of food. Here is an example of an animal whose environ- 
ment is quite scattered. 
The question of whether a blood meal is required, or if the 
mosquitos can live on the juices of fruits, must be answered 
separately for. each species. Of the species treated in this 
paper, there is no doubt but that they prefer human blood if 
that is available, and will struggle against many odds in order 
to get it. Darling (1912) found he could keep adults of Aedes 
calopus Meigen alive 110 days in captivity by means of raisins 
and ripe bananas, and Anopheles albimanus alive 12.5 days. 
The author has noted on several occasions Aedes taeniorhyn- 
chus Wiede. feeding on ripe bananas, and once, while searching 
