346 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 1 



perature recorded there/ and absolute minimum temperatures were 

 also recorded at Orono, and other points in Maine. Nests were im- 

 mediately collected from various localities in New Hampshire and 

 Maine. The mortalitj' record is given in the preceding table. - 



Locality. 



o c« « 

 fe t- ® 



s * «- 

 9 asm 



a" 



Si5 . 

 t; m c 



Portland,' Me — 

 Riggsville, Me ... 

 Rockland, Me — 

 Prospect Harbor 



Oxford, Me 



Mechanic Falls... 

 Augusta, Me 



-22 ( —16) 



-20 



-28 (*— 20) 



-20 



-20 (»— 25) 



-20 (*— 25) 



-42 ( —41) 



11 

 38 

 94 

 98 

 71 

 100 



389 

 315 

 399 

 278 

 282 

 269 

 264 



638 

 394 

 773 

 425 

 507 

 429 

 383 



These counts show that where average size nests of 300 to 400 

 larvffi were subjected to — 24°F. or lower, that from 72% to 100% 

 were killed, but that in large nests on oak from the same locality only 

 57% were killed. That the total mortality of the larvae in the nests 

 from Durham. N. H., after — 24°F. on January 24, 1907, was due 

 to the low temperature is demonstrated by there having been but 

 6.7% dead in 51 nests up to that date, when the mortality at once 

 dropped to 100%. The detailed records of the individual nests show 

 this absolutelv. 



1 — 24° F. was the official record of the station thermometer, but several 

 thermometers in the town, whose accuracy need not he doubted, recorded 

 —30° to— 35° F. 



-The counts of the nests were made under the immediate supervision of my 

 assistant, Dr. T. .1. Headlee, who jrave the matter most careful attention and 

 who has prepared the preceding sunmiary. Table I. 



■■'It is noticeable that the minimum for Portland is 6° below that of the 

 Weather Bureau, as given in Table I, and Augusta is 1° below. There is rea- 

 son to doubt the accuracy of some of these temperature records made by local 

 and untested thermometers, for Oxford and Mechanic Falls are half-way be- 

 tween Lewiston and North Bridgton, in the same latitude, where weather 

 bureau voluntary observers recorded — 24". Ajjain, it seems remarkable that 

 Rockland should drop to — 28° when none of the five other coast points from 

 Portland to Eastport registered below — 20°. It would seem probable that 

 Rockland was also about — 20° F. I have therefore placed the readings made 

 by weather bureau observers after those of Prof. Hitchings in ( ) and those 

 based on the above remarks in the same way with an *. 



