306 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 1 



1st. on a small elm bush growing in a slough in the midst of heavy 

 conifer timber. They were found in the same situation again two 

 days later. On June 18th they were found on the blossoms and leaves 

 of syringa near the experiment station in such numbers that we 

 counted at least a half-dozen every time we visited the bush. Through- 

 out June 19th and 20th they continued to feed in the same place and 

 in about the same numbers. On June 21st the beetles were discovered 

 in great numbers on volunteer squash near a small woodland, and by 

 June 24th they had appeared in injurious numbers in a squash patch 

 that lay a little farther from the same woodland. At this time they 

 were found copulating freely. On June 25th they appeared in in- 

 jurious numbers on the trap squash of our cucumber experimental 

 plats. These plats were twice as far from the woodland as the squash 

 fields first infested. By June 26th the beetles had begun to eat the 

 cucumbers, but evidently preferred the squash plants, picking them 

 out even from the midst of cucumber plants. On June 29th they ap- 

 peared for the first time in the experimental plats of squash. This 

 was fully one-eighth of a mile from any woodland and the late infes- 

 tation points significantly to the probable \vinter quarters of the 

 beetles. They continued in the plats from this time forward until 

 August, in the latter part of which the remainder of the old brood 

 practically disappeared. The new brood, particularly the males, be- 

 gan to appear in late August and the majority were out by the middle 

 of September. Practically all had gone into winter quarters by early 

 October. Dissection of material collected at intervals from June until 

 the middle of October showed clearly that the species is single-brooded 

 in New Hampshire. 



It has been found that the disturbance necessary to the determina- 

 tion of length of pupal period hastened the development of the insects. 

 It was, of course, necessary to break the earthen cells and, once pupa- 

 tion had occurred, no more cells were constructed. The pupae ex- 

 posed were carefully embedded in moist earth and allowed to produce 

 adults. Twenty-two individuals that came through to adults and 

 were thus disturbed at pupation, occupied an average of 47.81 days 

 under an average mean temperature of 70° F. and with an accumu- 

 lation of 3363.04° F. (read) or 3351.5° F. (measured), while 14 speci- 

 mens that passed without disturbance from hatching to adult required 

 an average of 55.14 days under an average mean temperature of 

 69° F., with an accumulation of 3814.96° F. (read) or 3802.35° F. 

 (measured). The specimens that were disturbed by breaking the 

 pupal cell required an average of 56.5 days to pass from deposition 

 of egg to adult beetle, under an average temperature of 70° F. with 



