64 



Trans. Acad. Sci. of St. Louis. 



TABLE 37. 



Period of Incubation. Eggs of 8. cecropia. South St. Louis, 1918. 



TABLE 38. 

 Period of Incubation. Eggs of S. cecropia. New York, 1913. 



TELEA POLYPHEMUS. 



Owing to the difficulty in getting Polyphemus to mate 

 in confinement, we have records on only 10 individuals 

 of this species from the different localities. (See Tables 

 39, 40, 41.) 



In this species too we see that the period of incubation 

 is influenced by the date of oviposition. For instance, 

 in Table 39 we have the eggs of 5 females laid in June ; 

 these have a period of 6 to 8 days. In this same table 

 we have another lot of eggs deposited on May 20 which 

 required 11 days. In Table 40 are the eggs from two 

 insects, one's oviposition commencing on May 11 and 

 the other on June 10; the earlier lot required 11 to 13 



