72 Annals Entomological Society of America [Vol. IV, 



we cannot foresee of what great importance the most trivial 

 observations may become in the future and there is, doubtless, 

 more than one cause for variability in periods of development. 



SUMMARY. 



The following paper merely contains additional biological 

 data along the same lines as those presented previously, obtained 

 during the season of 190cS, together with an account of the 

 breeding of adults in confinement which resulted in reproduc- 

 tion by the second generation of adults under adverse condi- 

 tions. This reproduction by the second generation of adults 

 apparently, was further hindered by actual starvation and was 

 scanty, but the behavior of the beetles would lead to the belief 

 that they were both willing and eager to reproduce. The fact 

 is clearly shown that reproduction occurred with a pair of normal 

 adults of the second generation, a result contrary to what we 

 understand to be the meaning brought out by Tower (1906), 

 discussed previously (Girault, 1908). We do not, however, 

 make any claims, but the evidence is sufficient to establish the 

 fact that exceptionally the adults of the second generation in 

 normal beetles do develop the germ-cells before a period of 

 hibernation. 



mi': EGG, 

 1. Length of Stadium* 



The duration of embryonic development was determined 

 for about nine hundred cases during the breeding season and 

 the results are tabulated in Table I. The separate lots were 

 confined as previously, in darkness. In every case recorded 

 the time is actual, unless noted to the contrary. By comparing 

 these records with those given by Girault (1908, Table I, 

 p. 156), differences are noticeable in regard to the duration of 

 the stage at the same approximate dates for the two latitudes; 

 witness Lot I of the two tables. We should expect to find here 

 a corresponding difference in the temperatures. 



* This term is used in preference to instar which was originally proposed to 

 designate the insect itself al any stage or period of development, as the egg instar, 

 third larval instar and SO on, just as we say the larva, caterpillar, pupa or imago. 



