667 



cut out from its base on that date, and, between Ith and 8th May, 

 the trees were again examined, those previously attacked having been 

 marked. On 8th May, 78 trees had been attacked again, of which 

 20 had not been infested previously and 58 had been infested before 

 24th April. The remaining 33 trees which had been attacked before 

 24th April were not attacked again. Some of the trees from which 

 the shot-hole had been eradicated on 24th April had only one branch 

 left, so that the possible area of attack was considerably lessened, 

 making the number of trees re-attacked still more prominent. This 

 simple experiment has nelded the following results, which have since 

 been confirmed : — (1) An emergence of the beetle took place from the 

 surrounding infested tea between 24th April and 8th May. (2) During 

 the wet season, there is considerable activity on the part of the insect. 

 (3) Trees attacked once, are highly hable to further attack. (4) An 

 invasion of the beetle will infest trees not previously attacked. (5) To 

 leave one branch on a tree unpruned — a suggestion which is current 

 for the control of the borer in the pruning season— courts the increase, 

 rather than the decrease, of the beetle. In conclusion, Mr. Speyer 

 laid emphasis on the fact that the extermination of the pest is a 

 matter for urgent and pressing haste. 



Hopkins (A. D.). A New Genus of Scolytoid Beetles.—-//. Washington 

 Acad. Sciences, Washinyton, D.C., v, no. 12, 19th June 191-5, 

 pp. 429-433. 



This paper describes a new Scolytid genus, Conophthorns, Hopk., 

 and contains a key to a number of new species. These beetles inhabit 

 the young cones and, in rare cases, the twigs and shoots of different 

 species of Pinus. Pinus ponderosa and P. lamhertiana on the Pacific 

 Slope [see below], P. strohus in the Eastern States and P. scopulorum 

 in the Rocky Mountain region are chiefly attacked. 



Miller (J. M.). Cone Beetles: Injury to Sugar Pine and Western 

 Yellow Pine.— f/. S. Depl. Agric, Washington, D.C., Bull. no. 243, 

 24th July 1915, 12 pp., 5 plates. 



Injury distinguished by the dying of immature cones soon after the 

 starting of the second year's growth and termed " blighted cones " 

 occurs frequently in the seed crops of sugar pine {Pinus lamhertiana) 

 in California and Oregon, and of western yellow pine (Pinus ponderosa) 

 in the Pacific coast and southern Rocky Mountain regions. The 

 greater part of this damage is caused by the Scolytids, Conophthorus 

 lambertianae, Hopk. (sugar-pine cone beetle), and C. ponder osae, Hopk. 

 (western yellow-pine cone beetle). Their life-history and the damage 

 caused by them are entirely connected with the cones of the host trees. 

 The adults bore a small tunnel through the axis of the cone, in which 

 the eggs are deposited. The larvae feed upon the scales, seeds and 

 tissues of the withering cone, the pupae being formed within the same 

 cone as that in which the larvae develop, and the adults hibernate in 

 it. The emergence of the adults of C. lambertianae takes place 

 early in May. From the end of May to the end of June the second-year 

 cones are attacked and the eggs are deposited. From the beginning 

 of July to the end of August, new adults arise and the cones fall from 



