84 



Kansas Academy of Science. 



Since the moths are commonly found resting on the bags, they are 

 thought to spend most of their lifetime in this manner, although in 

 very dim light, and at nightfall, they hover about on the wing. Reared 

 adults kept in confinement without being allowed to mate at all lived 

 from five or six days to about ten days. On a basis of five records that 

 were obtained in such respects, the data gave an average of eight days 

 for the term of maturity. 



ATTAINMENT OF A GENERATION. 



According to a published statement, the eggs of the Angoumois 

 grain moth hatch in from four to ten days after deposition. On con- 

 sidering that ten days would afford a sufficient period during moderate 

 weather in early spring to admit of oviposition and the subsequent hatch- 

 ing of the eggs, dating from the confinement of parental moths, which 

 was done on March 16, the resulting issue of larvje very likely occurred 

 on or about March 26. By using this calculation to fill the gap caused 

 by the lack of timely records, it and the available data on breeding can 

 best be presented in the following schedule. This tabulation is made 

 with reference to the periods of sequential development of stages as 

 were determined in three bleeding tests comprising part of a series. 

 The respective durations are also averaged, and the table concludes 

 with a computation of the number of days required for the attainment 

 of a generation: 



As is shown by the schedule, the time from confinement of parents to 

 the emergence of adults of a new generation ranged from fifty-four to 

 seventy-four days, giving an average of sixty-nine days. On this esti- 

 mate, as many as five or possibly six generations at least may be ex- 

 pected to occur in a year. Irregularity of development is evident, and 

 summer temperatures may exert an accelerative sway upon the broods. 

 Owing to the incompleteness of records on the breeding of this species, 

 however, much work needs to be done in order to ascertain the particu- 

 lars of development and seasonal history with exactness and complete- 

 ness. 



