TEMPERATURE AND APPEARANCE OF BEETLES. 
119 
The effect of temperature in these records is obscured to a con- 
siderable extent by other conditions that affect the number of beetles 
caught by jarring, as winds, rains, proximity to hibernating grounds, 
and number of beetles previously caught. But the data seem to show 
that some beetles will become active at a mean temperature of 55 to 60° 
extending over three or four consecutive days, and that a mean 
temperature above 60° for several successive days will bring out the 
beetles en masse. After the beetles have once come out of winter 
quarters they may be jarred from the trees following periods with a 
mean temperature much below the degree required to bring them 
into activity, though such periods of cold weather greatly reduce 
the numbers caught. In Table LXVII is given a summary of the 
data in Table LXVI, showing the number of beetles caught at 
different temperatures for all five localities. 
It will be seen from this table that beetles have been jarred in 
considerable numbers following days with an average mean tem- 
perature below 55° and even below 50°. But by a study of Table 
LXVI it would seem that these beetles had been brought out by 
earlier spells of warmer weather and were already on the trees when 
the temperature dropped immediately preceding the jarrings. Prob- 
ably a mean temperature of between 55 and 60° is required to cause 
the beetles to leave their hibernating quarters. 
Table LXVII. — Number of beetles of the plum curculio jarred at different temperatures, 
all localities combined. 
Average 
Average 
daily 
Average 
daily 
Average 
mean 
tempera- 
tures 
Jarrings. 
Beetles 
caught. 
beetles 
per jar- 
mean 
tempera- 
tures 
Jarrings. 
Beetles 
caught. 
beetles 
per jar- 
since last 
ring. 
since last 
ring. 
jarring. 
jarring. 
°F. 
°F. 
39 
40 
41 
42 
43 
1 
2 
1 
57 
58 
59 
60 
61 
3 
69 
23 
"i" 
V 
6" 
4 
2 
"""706"' 
351 
22 
iis" 
88 
11 
2* 
4" 
2" 
44 
2 
76 
38 
62 
3 
221 
73 
45 
3 
3 
1 
63 
2 
334 
167 
46 
4 
38 
9 
64 
6 
361 
60 
47 
1 
1 
1 
65 
3 
342 
114 
48 
2 
68 
34 
66 
5 
301 
60 
49 
1 
7 
7 
67 
6 
991 
165 
50 
9 
166 
18 
68 
3 
258 
86 
51 
4 
102 
25 
69 
4 
1,212 
303 
52 
6 
98 
16 
70 
5 
1,122 
224 
53 
3 
95 
32 
71 
4 
1,426 
358 
54 
4 
99 
25 
72 
2 
138 
69 
55 
2 
99 
49 
:;* 
2 
113 
56 
56 
5 
124 
25 
74 
2 
303 
151 
7.") 
1 
103 
103 
