36 



Ichneunionid, belonging to the subfamily Pimplinak, of a new gcMuis 

 and species, is frec^uently found in the tunnels in Montana and Idaho ; 

 and this parasite kills as many as 80 per cent, of the larvae of 

 second-growth trees in some localities. It is as ineffective as the bird 

 for the same reason. Another, somewhat larger parasite, Ichneumon 

 sp. n., is fre(|uently f(nind in winter in the chrysalis of the moth. It is 

 less numerous and conse(|ucn<ly of still less economic importance. 



With the elimination ol' the main opportunities for ])ropagation, all 

 these agents would check the ravages of the moth in rationally managed 

 woodlands. It is necessary to remove : (1) Trees, which below the 

 spike, show branches with yellow needles^ — a certain indication of 

 present infestation ; (2) those which are struck by lightning and remain 

 green, as the moth usiuilly breeds in great numbers along the lightning 

 scars; and (3) those with kiu)])l)y growths on branches. Open, sunny 

 stands of timber are those most alTected by P. zimniermani. It appears 

 to be an absolute necessity to the insects' existence in a locality stocked 

 with second growth that some mature trees should be present which 

 liave been left to reseed the area or on account of ])eing unfit for logs, 

 as these constitute l)ro()d trees. Out of a hundred trees infested in the 

 West, about 80 ])er cent, are yellow })ine, 15 per cent. lodge-])ole pine, 

 and 5 jwr cent. Douglas fir. Trees with a thick layer of fresli bark and 

 cambium, as well as the nu)re vigorous growers, are preferred for 

 attack. While the mature trees provide the most favourable conditions 

 for tliis moth, it does the greater damage in smaller ones, up to a foot 

 in diameter. Mature trees are usually attacked from between 10 to 

 30 feet from the top down and second growth trees from about breast- 

 high up to from 35 to 10 feet. 



Insect Hotes.— Mlhh/. Bull. Cal. Stale Conwiiss. Hortic, Sacramento, 

 iv, no. 10, 0(t()i)er 1915, p. 484. 



Tlu^ (V)ccinellids, Cryptolaenins montrouzieri, Muls., Hyperaspis 

 lateralis, Muls., and Sci/ntn.as sordid as, Horn, have been doing effective 

 work against Pseudococciis cilri, llisso (citrus mealy bug). The solanum 

 mealy bug, Pseadococciis solani, Ckll., was r(>ported as injuring tomato 

 vines. Anij)hicerus punctipennis, Lee. (western twig borer), has been 

 found working in prunings from an orange orchard. Pseudococciis 

 ri/ani, Coq. (cypress mealy bug) was being controlled by H. lateralis. 

 Seymnas coniferarum has been found destroying Pseudococdis pini. 

 S. gutlHlafiis, Lee, and *S'. sordidiis, Horn, were found attacking 

 PseHdoroccas aurilanaiiis. Mask, (golden mealy bug), infesting Araucaria 

 excclsa (Norfolk Island ] ine). S. maryinicollis, Mann., was also 

 observed to attack Coccids. Bamboo was reported to be heavily 

 infested by Asterolecanium bambusae, Bdv., in one locality, and in 

 another, camphor trees were attacked by Chrysomphalus aurantii, 

 Mask. Pissodcs radiatae (Monterey pine weevil) was reared from 

 Pinus silvestris early in September, 



Maskew (F.). Quarantine Division, Report for the Month of August 



1915. — Mlhly. Bull. Cal. State Co7)imiss. HorHc, Sacramento, iv, 

 no. 10, October 1915, pp. 485 487. • • ■ 



Among the pests intercepted in August 1915 were the following : — 

 Cj/clas formiearius in sweet potatoes from China ; Pseudococcus 



