270 Annals Entomological Society of America [Vol. VIII, 
(8). Mosquitos were found to harbor during the daytime 
under buildings in Gatun, a low estimate placing the ftarsi- 
maculata population under buildings at ten thousand per day. 
(9). The tarsimaculata and teniorhynchus exhibited extreme 
voracity, and would continue to suck blood although placed 
in direct sunlight. While feeding, the abdomen of several 
adults was snipped off without causing apparent pain or total 
cessation of activities. 
(10). These mosquitos would alight on a coat ‘hanging on a 
tree, or in a cast-away pair of leggings. Odor probably is the 
main impulse, though preference to dark colors is shown. The 
mosquitos actually were trying to sink their proboscis into the 
leather and cloth. 
(11). Both species, when allowed to feed unmolested, 
ejected from their anal openings droplets of clear fluid which 
later became tinged with reddish, finally resulting in pure 
blood. ; 
(12). Behavior is defined as adaptation to the environment. 
Successful attunement to the environment infers repeated 
collisions with unfavorable conditions and successful coping 
with these conditions. The apparent domestication of albi- 
manus appears to be the result of such attunement brought 
about through combatting successfully new and _ adverse 
conditions. 
(13). During flight the phototropic response is dominant. 
At the breeding place this tropism is often over-ruled by that of 
hunger. When in flight, the mosquitos seem to adjust them- 
selves with respect to the wind so as to gain the greatest benefit 
therefrom. 3 
