258 



JOURNAL OF ECONOMIC ENTOMOLOGY 

 Dbvelopmbnt of Grubs prom Hatching to Pupation 



[Vol. 10 



.52.1 



7.2 



59.2 



The average time for 36 individuals in the larval stage proper was 

 52.1 days, with a maximum . of 70 days and a minimum of 40 days. 

 The average prepupal stage for 36 individuals was 7.2 days, with a 

 maximum of 11 days and a minimum of 4 days. 



The Pupa. — The pupa (PI. 12, fig. 4) is about 15 mm. long and 9 mm. 

 in maximum width. Emergence from the old larval skin is accomplished 

 by splitting the skin first along the epicranial suture and finally almost 

 the full length of the back. In some cases, the pupa remains within 

 the moulted exoskeleton, while in others it twists its way out. When 

 newly transformed, the pupa is creamy white in color but soon darkens 



