1911] 



Notes on the Colorado Potato Beetle 



77 



and was general at 8 A. M., June 5, concluding at 2 p. M., 

 June 5, occupying a period, of 21 hours. But 18 larvae suc- 

 cessfully survived the ecdysis. Entering the soil for pupation 

 began on June 7, at 4:30 a. m. and all larvae had entered 

 "by June 8, 7 p. m. Tabic III summarizes. 



2. Number of Ecdyses. 



There can be no doubt but that the normal number of 

 larval ecdyses, excluding pupation, is three and as additional 

 evidence we have observed this number in two hundred and 

 the fifty cases during the season without a single exception for 

 whole number. The question may be considered as settled. 



3. Duration of the Larval Stage. 



There being no data concerning this point other than what 

 are already included in Table III, it is unnecessary to repeat 

 them here, but reference should be made to the column of 

 sums of that table. 



THE PUPA. 

 1. Duration of Pupal Stage. 



Table IV summarizes sufficiently well all of our data for 

 1908 concerning this phase of the beetle's life cycle. 



TABLE IV. 

 Duration of Pupal Stage, Actual Time ix Soil, Season 1908. 



* These numbers correspond with the lots in Table III. 

 t Average of Lots No. 1 to 12, 13 days, 19J|> hours. 



