252, Annals Entomological Society of America [Vol. VIII, 
C. BEHAVIOR. 
1. Flight. 
a. By Direct Observation. 
I. The Le Prince Observations: Mr. J. A. Le Prince 
detailed sixteen sanitary inspectors to report at Gatun on 
March 28th, 1913, to observe the evening and morning flights. 
A graphic representation of the positions taken and the facts 
obtained are given in the following two charts and map. A 
line of observers was strung on the peninsula and the island, 
parallel to the old French Canal, intercepting the line of flight 
of the mosquitos for more than a mile. Four additional observers 
were stationed along the railroad at and beyond New Gatun. 
EVENING OBSERVATIONS 
Le Painece Exp. 
Clulex Flight) ended Pee 
Wa 
culete Flight Anopheles noted 
— > 
Anopheles 
noted 
vit vil 
ix v/ Vv Ve xX WW 1 
The instructions given were: 
To observe (1) when the first culex appeared; (2) when the 
first Anopheles appeared; (3) when the culex were thickest; (4) 
when the Anopheles were thickest; (5) when the culex flight 
ceased; and (6) when the Anopheles flight ceased. The men 
were at their posts by 5:30 p. m. on the 28th and by 5:30 
a. m. on the 29th, early enough not to miss anything. 
The charts show a fairly even flight along the line parallel 
to the breeding place. The evening flight began at a little 
MAx- 
