THE CONCHUELA. 



35 



temperature conditions, as 

 subject of hibernation. 



will be further discussed under the 



RELATION OF TEMPERATURE TO ACTIVITY OP ADULTS. 



Observations were made in October on some surviving specimens 

 of the lots included in Table IX for the purpose of obtaining infor- 

 mation on the effect of temperature on the feeding of these insects. 

 The number of observations is too small to determine this point in 

 more than a general way, and we are justified only in concluding 

 that the degree of temperature at which feeding ceases is between 

 52° and 60° F. 



Table XII. — Observations on relation of temperature to feeding of the conchuela. 



Date of observation. 



Hour. 



Temper- 

 ature. 



Number 

 of adults 

 feeding. 



Number 

 of adults 



not 

 feeding. 



Remarks. 



1905. ■ 

 October 11 



8 p. m. 

 7.15 p.m. 

 8.30 a. m. 

 8.15 p. m. 

 8.30 a. m. 



°F. 



55-60 

 66 

 49 

 52 

 51 



8 





 

 



8 

 12 

 14 

 19 

 ol9 



Specimens in laboratory. 

 Do. 



October 19 



October 20 



Specimens out of doors. 



Do 



Specimens in laboratory. 

 Do. 



October 21 







a Including one with setse inserted in boll, but motionless and evidently not feeding. Plant-bugs in 

 the laboratory have even been observed to die in this position. 



For comparison, observations were also made with a miscellaneous 

 lot of Pentatomids, including specimens of Pentatoma sayi, Euschistus 

 servus, Nezara liilaris, and Thyanta custator. These are summarized 

 as follows : 



Table XIII. — Observations on relation of temperature to feeding of miscellaneous 



Pentatomids. 



Date of observation. 



Hour. 



Tempera- 

 ture. 



Number of 

 adults 

 feeding. 



Number of 



adults not 



feeding. 



1905. 

 October 11 



8 p. m. 

 7.15 p. m. 

 8.15 p. m. 



°F. 

 55-60 

 66 

 52 



5 

 4 







5 



October 19 



3 



October 20 



7 







Eggs, 

 period op incubation. 



As is the case with all insect eggs, the developmental or incubation 

 period of the eggs of the conchuela is influenced to a marked degree 

 by slight variations in temperature. From the entire lot of egg- 

 batches deposited in the laboratory, numbering over 160, 26 have 

 been selected for a study of the relation of temperature to incubation 

 period, owing to the comparative completeness of the records. The 



