COISE BEETLES. 6 



progress made by the adults without cutting the cone open, and 

 when thus disturbed the adult at once ceases its work. However, it 

 has been observed that the egg gallery has been extended entirely 

 through the small cones within five to eight days after attack. For 

 the same reason the period of incubation of the eggs within the cone 

 has not been definitely determined. In cones cut open, eggs that 

 had apparently just been deposited incubated in from two to four 

 days. 



One pair of parent beetles are found in each of these egg galleries. 

 A series of specimens collected from individual cones was submitted 

 to Dr. A. D. Hopkins, and from his determination of sex it was found 

 that one male and one female beetle occupy each egg gallery. As a 

 rule but one pair of beetles attack a single cone, but in some instances 

 three pairs of beetles have been found advancing as many egg 

 galleries in the same cone. The sex of the parent which makes the 

 initial attack on the cone and begins the excavation of the egg gallery 

 has not been determined. 



The immediate effect of this attack on the cone is to check all 

 further growth. Eventually the infested cone withers, then becomes 

 dry and hard, but for a period of time it hangs on the tree in a semi- 

 moist and souring condition. It is during this period that the eggs 

 of the beetle incubate and the young larvae develop. The condition 

 of the cone may be compared to that of the cambium of a pine 

 which has been infested by Dendroctonus, and is in a fading or dying 

 condition while the larvae of the new broods of beetles are developing. 



Table I. : — Emergence record of the sugar-pine cone beetle (Conophthorus lam- 

 oertianae) in California and Oregon, 1913-lJf. 



Hopk. 

 U.S. No. 



Locality. 



Date of 

 collection. 



Material. 



Period of spring 

 emergence of over- 

 wintered adults. 



Remarks 



11498 

 10802 



10833a-2 



Kyburz, Cal. 



Pino Grande, 



Cal. 

 do 



Hilt, Cal. 



10S33a-3 Ashland, Oreg. 



10P38a-2 



nS71a 

 108', la-2 



10884a 



Little Butte 

 Creek, Oreg. 



Hilt, Cal 



do 



Ashland, Oreg 

 Hilt, Cal 



Apr. 11,1913 



May 11,1913 

 May 26,1913 



July 11,1913 



Sept. 5,1913 



Aug. 23,1913 



Nov. 13,1913 

 May 2, 1914 



Feb. 14,1914 

 Mar. 13,1914 



Overwintered 

 adults in 1911-12 

 cones. 



....do 



.do. 



New adults in 1912- 

 13 cones. 



....do 



....do 



....do 



Overwintered 

 adults in 1912-13 

 cones. 



....do 



....do 



May 19-May 31, 

 1913; 43 adults. 



May 14, 1913; 12 



adults. 

 Emerging May 26, 



1913. 



June 4. 1914; 6 

 adults. 



Apr.l9-June4,1914; 



16 adults. 

 Apr. 25-May 21,1914. 



June 2- June 13, 1914. 

 May8-May31,1914. 



Mayl9,1914;ladult. 



Apr. 20-Mav 20, 

 1914; 10 adults. 



Breeding cage kept 

 outdoors. 



Do. 



A considerable per- 

 centage of un- 

 emerged adults 

 still in cones. 



Breeding cage kept 

 in laboratory. 

 Heavy emergence 

 during Aug., 1913. 



Breeding cage kept 

 in laboratory. 

 Do, 



Do. 



Breeding cage kept 

 outdoors. 



Breeding cage kept 

 in laboratory. 

 Do. 



