68 II I HI. KNAT I o_\ OF THE COTTON BOLL WEEVIL. 



tiona] earliness of i he season preparat ions for the regular observations 

 upon emergence from hibernation were not sufficiently complete for 

 beginning the work until March 1 and in each locality this date may 

 very reasonably be considered as the beginning of the emergence 



period. 



Previous experience having demonstrated the necessity of keeping 

 the records upon this work according to a uniform system in each 

 locality, the preparations were much more elaborately made than for 



any previous work. Comprehensive forms upon which the records 

 might be entered with a minimum of labor were prepared covering 

 five distinct divisions of the work: (1) Meteorological record; this 

 record covered maximum and minimum temperatures, atmospheric 



humidity, rainfall, sunshine or cloudiness, and winter conditions. 

 (2) Emergence record; this record showed the emergence in each 

 section for each date. The records for one week were placed upon a 

 card so that the totals for emergence for each day. and also lor each 

 section for each week, could be very readily ascertained. (3) Sect ion 

 record; this covered in more detail the emergence in each section 

 and indicated the sex of emerging weevils and what disposition \\a< 

 made of them, in such a way that their records could be followed until 

 the time of death. (4) Longevity records for fed weevils. (5) Lon- 

 gevity records for unfed weevils. 



This systematization of the record work has proved an invaluable 

 help in compiling the results of this extensive series of observations. 

 The general facts regarding the relationship exist ing between climatic 

 conditions and weevil emergence are indicated graphically in figures 

 6 to 8. The most important conclusions upon special points can only 

 be shown by special arrangements of the data in each ca>e. These 

 tables have been made as concise as seems possible. Practically each 

 line in the tables expresses only the summary of a large number of 

 compiled records. The magnitude of the work involved in the com- 

 pletion of such data can be appreciated only by one who has under- 

 taken a similar task. 



RELATIONSHIP OF EMERGENCE FROM HIBERNATION TO CLIMATIC CON- 

 DITIONS. 



Figures 6 to 8 have been prepared in the same form as figures 3 to 

 5, since they express a continuation of similar facts. 



In former reports, 6 dealing especially with the life history o\' the 

 boll weevil, it was stated that emergence began about the time 

 when the mean temperature rose above 60 c F. Tlie more complete 



The senior author desires to ex pre-- particular appreciation of the greal amounl of 

 detail work which lias boon done by the junior author (Mr. W. W. Mothers in the prep- 

 aration of the summaries covering ilii> work. 

 &U. S. Dept. Agr., Bur. Km., Buls. 15 and 51. 



