1915] Behavior of Anopheles © Det 
Rainfall of such character exerts great influence upon the 
environment and its biota. With heat and wind it regulates 
the environment. 
E. ANNUAL RAINFALL FOR THREE YEARS. 
é Station | Years of| Rainy 
Station 1911 1912 1913 | Average | Record | Days °13 
AMCONM Ye Saws n sce eal, ROL Le 71.78 65.98 70.90 16 180 
TEX Noloyie Aaah ater Ree 63.73 71.89 59.54 69.86 15 169 
Mira ghilones 2.) o5 a. 61.97 88.49 AOIZ 87.33 5 183 
Pedro Miguel.........] 64.12 (ay TAl 69.65 82.32 6 180 
Rio Grande), wae. 82.11 75.14 64.51 86.13 9 199 
Culebra. vee ites oe 74.84 78.99 69.09 88.78 23 195 
Comachos sae tee ec 77.98 73.79 91.46 a 190 
IMA PING a: Walsegtecnn reas 66.70 74.56 74.78 80.43 9 196 
Gamboa neta 70.67 89.07 86.28 92.65 31 207 
Nittany Wiinale. ne a4 oan hoz. 20 StS ie eg ar dT a 87.04 3 190 
Ailnanielaveris aac a 90.05 83.73 77.41 102.438 14 196 
IDI AVG one Seige jciemeeaa|n beter t0oes OF Gben a btalove |) lOa.22 5 197 
Braj OWlesee ar eare tReet Oks A 104.66 | 109.34 | 107.01 2 243 
tringdadsy. settee s 91.53 | 103.04 9727 |) L203 6 258 
Montetiiriog s. as... 11S E27 100.74 | 107.58 | 129.75 6 177 
Gatun aan se ane 99.28 | 111.838 | 112.81 129.30 9 248 
Brazos BLOOK. ss. me 116.08 124.66 138.89 138.64 7 260 
(Colona mcce es hea ILS 7. |) LS) IBA PAS) ais) 43 246 
Bortorsellowemanrs ae 148.94 | 147.61 Ales | SLGOR 1S 6 272 
The daily rainfall at Gatun from September, 1912 to Sep- 
‘tember, 1913 is given in table “‘F’’. The dry season months 
of January, February and March show but 38 rainy days out 
of the 90 of this period. But the rainfall has been less than the 
average for the station. Only on three days had there been 
rainfall in excess of one inch. The rains nearly always fall 
during the afternoon, but it is not unusual to have a mean, 
drizzling rain all day long, augmented by a changing wind. 
Thunder storms or violent rains are rare. 
