124 THE CANADIAN ENTOMOLOGIST 



Pupa. — The pupse are from 10 to 12 mm. long. When freshly transformed 

 they are creamy-white but they gradually darken as the adult colors are as- 

 sumed. The four grubs reared to pupation, as noted in table II, were likewise 

 successfully reared to adults. Their period of pupal life is shown in table III. 



Tabi^e; III. — Length of Pupal Stage. 



Summary. 



The beetles of Strigoderma arboricola occur during May, June, and July. 

 Egg-laying occurs in June and July. The eggs hatch in from 10 to 14 days, and 

 the grubs pass the winter in the soil, requiring an average of 321.7 days to 

 reach the prepupal condition which in turn requires 4 to 8 days, making an 

 average combined larval stage of 328 days. The prepupal stage varies in length 

 from 11 to 14 days with an average of 12.7 days. The four individuals reared 

 to maturity, with their egg stages added, required 351, 352. and 358 days for 

 complete development. 



Literature Cited. 



Blatchley, W. S. 1910, An illustrated descriptive catalogue of the Coleoptera 

 or beetles (exclusive of the Rhyncophora) known to occur in Indiana — Nature 

 Publishing C, Indianapolis. 



Casey, T. L. 1915, A Review of the American species of Rutelinse, Dynas- 

 tinse and Cetoniinse. 



Memoirs on the Coleoptera VI. pp. 1-394. Hart, C. A., and Gleason, H. A. 

 1907, On the Biology of the Sand Areas of Illinois. Bull. III. State Lab. Nat. 

 Hist. 7:137-272. 



McColloch, J. W. 1917, A Method for the Study of Underground Insects. 

 Journ. Econ. Ent., 12: 109-117. 



Popenoe, E. A. 1877, A list of Kansas Coleoi)tera. Trans. Kans. Acad. 

 Sci. V. pp. 21-40. 



Vestal, A. G. 1913, An Associational Study of Illinois Sand Prairie. Bull. 

 111. State Lab. Nat. Hist. 10:l-';6. 5 pis. 



