306 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 6 



the central coast region, as from Casma to Lima, than during the rest 

 of the year. It was found at Lima to be only moderately active during 

 July. The season from June to November in the Lima region seems 

 cool enough to interfere to a considerable extent with the weevil's 

 activity, at least to the extent of retarding its development consid- 

 erably. The Lima temperature ranged during July, 1912, from 55** 

 to 68° Fahrenheit, or 13° to 20° Centigrade; while the humidity 

 hovered around the saturation-point most of the time. The rest of 

 the year does not show sufficient aridity to check the activity of the 

 weevil, while the much higher temperature accelerates its develop- 

 ment. The warm season of 1912 was unusually humid in the Casma 

 to Lima region, and it is therefore certain that the weevil was more 

 than ordinarily active there at that time; but it is equally certain 

 that it remains active through the hot season to a considerable extent 

 in the central coast region, while in Piura the excessive aridity cuts 

 short its activity. 



Chosica is colder at night and warmer during the -day in the cool 

 season than Lima. Its temperature ranged during July, 1912, from 

 45° to 79° Fahrenheit, or 7° to 26° Centigrade; the relative humidity 

 is very low throughout the year. The weevil was found at the very 

 lowest ebb of activity in July, 1912, just above Chosica, only one 

 adult being found in a green square during two hours' search. It is 

 quite certain that it is somewhat more active in the Chosica region 

 during the warm season, l^ut not enough so to cause any material 

 damage. The Chosica climate can not be termed even subhumid 

 at any time of the year, though the relative humidity is slightly higher 

 during the Avarm season. 



' The weevil is not yet investigated in the lea districts, but it is 

 practically certain that it exists there to a somewhat greater extent 

 than at Chosica. It was found abundant and active at Tambo de 

 Mora during May and June, 1912. Temperature at lea during July, 

 1912, ranged from 45° to 73° Fahrenheit, or 7° to 23° Centigrade. Its 

 nights during the cool season are thus about the same as those at 

 Chosica, while its days are not so warm. It is arid like Chosica for 

 most of the year, except for considerable relative humidity at night 

 only from June or July to November and some slight cloudiness in 

 the day from August to October. This climate must allow the weevil 

 at least two or three months of activity during the year, but it is 

 probably not so highly active here at the best as during the more pro- 

 nounced subhumid season in Piura. It is worthy of note that, while 

 the weevil is probably the least active in the Chosica and lea districts, 

 its maximum of activity in these two districts comes at opposite seasons- 

 of the year. 



