REPORT OF THE STATE ENTOMOLOGIST I913 



31 



W 



The grubs are moderately stout, white, footless borers, with a 

 brownish head, and when full grown are about three-eighths of 

 an inch long. 



The creamy white pupa is about one-quarter of a inch long, 

 white, except for the dark brown eyes and the brownish tips of 

 the jaws. It may be easily recognized by the stout beak lying 

 against the breast. The tip of the last abdominal segment bears a 

 pair of slender, curved spines. As the pupa attains maturity the 

 color of the beetle begins to appear. 



Life history. The weevils commonly winter in any available 

 shelter and, according to observations upon allied forms abroad 

 and in this country, it is probable that the beetles live two or three 

 years, depositing eggs 

 each season. The lat- 

 ter are usualy placed 

 in the leading shoots 

 during May and June. 

 An examination at 

 Cooperstown May 21, 

 1913 showed that 

 many of the leading 

 shoots bore feeding 

 punctures and a num- 

 ber of eggs were 

 found, although the 

 season was cold and 

 backward. The eggs 

 are said to hatch in 

 from six to ten days, 

 and the small, white 

 grubs at first feed 



upon the inner bark and sometimes extend their operations down to 

 portions of the stem two yeafs old. At Cooperstown July 8th there 

 were numerous full-grown grubs in the cells and about 10 per cent 

 of the shoots in the planting had been killed. The grubs are some- 

 times so numerous in a stem as fairly to riddle the inner bark and, 

 in some instances, there is hardly room enough for the oval pupal 

 cells, each about one-quarter of an inch long. The beetles escape 

 from the shoots the latter part of July through to early September. 

 It is well known that the weevils persist throughout the season, 

 they being more abundant, according to our collections, from the 



^. 



Fig. 7 



Pupal cells of white pine weevil (natural 

 size, original) 



