00 EXPERIMENT STATION RECORD. 



sexual stage. The author designates this phenomenon, in which the males are 

 absent, as spanandry. 



Since the previous account was published a very similar case of the oblitera- 

 tion of sexual reproduction has been observed in C. strohi which lives on 

 Pinus strohns. A rudimentary sexual stage takes place on Picca nigra. 

 Winged forms migrate in large numbers to P. nigra where they give rise solely 

 to females. It is probable that in America there exists another race of C. strohi, 

 in which the normal sexual stage occurs on Picea. A third type on which the 

 sexual stage has hitherto been thought to be completely obliterated, is found in 

 C. pica;. This species lives on Abies pectitmta; it is very near C. nussVini, 

 from which it is distinguished morphologically and also by the fact that sexual 

 reproduction does not occur. The author has found that in C. picw winged forms 

 occasionally may appear. These forms do not migrate to Picea, but remain 

 on A. pectinaia where they produce parthenogenetic forms. 



Mealy bug parasites in the Far East, H. S. Smith {Mo. Bui. Com. Hart. 

 Cal., 3 (WW, No. 1, pp. 26-2.9).— Previously noted from another source (E. S. 

 R., 30, p. 753). 



Appearance of Icerya purchasi and Novius cardinalis in the District of 

 Beira Baixa (Portugal), C. Mendes {Brotcria, /SV/-. Zooh, 11 (1913), Xo. 2, p. 

 146; ahs. in Intermit. Inst. Agr. [Rome], Mo. Bui. Agr. Intel, and Plant Dis- 

 eases, 4 (1913), No. 8, p. 1310).— The occurrence in 1910 of a large number of 

 fluted scales on acacias (Acacia melanoxylon) in Beira Baixa was followed 

 by the appearance of the lady beetle iV. cardinalis, atid within a year all the 

 fluted scales were destroyed by this predator. 



The San Jose scale, the oyster shell bark louse, and the scurfy bark louse, 

 J. S. HousER (Ohio Sta. Clrc, UfS (1914). pp. 49-62, figs. 11).— Brief popular 

 accounts of these three scale jjests and directions for combating them. 



On the zygotic constitution of dominant and recessive whites in the silk- 

 worm, Bonibyx mori, K. Toyama and S. Mori (Ztschr. Induktive Ahstam. u. 

 Vererbungslehre, 10 (1913), No. 3, pp. 233-241).— This report of studies con- 

 ducted at Tokio includes a bibliography of 15 titles. 



Turnip moth larvae injuring tobacco in Hungary, B. Grof (Magyar 

 Doli6uynjsag, 30 (1913), No. 11, pp. 3, 4; abs. in Intenmt. Inst. Agr. [Rome], 

 Mo. Bui. Agr. Intel, and Plant Diseases, 4 (1913), No. 8, p. 1307). — The larva of 

 Agrotis segctum. is reported to tunnel in the ground .ibout 2 in. below the sur- 

 face and destroy the roots of tobacco. 



The spraying of oak trees in Richmond Park (Entomologist, 46 (1913), No. 

 601, p. 195). — This note relates to the spraying of some 400 oak trees with lead 

 chromate for the control of defoliating caterpillars. 



Beetles becoming parasites, V. L. Kellogg (Science, n. ser., 39 (1914), No. 

 1001, pp. 360, 361). — The beetles mentioned include the beaver parasite Platy- 

 jisylla castoris, which lives all its life both as a larva and adult on its host; 

 Leptinus testaccns, which frequents the nests of field mice, shrews, and other 

 small mammals of similar habit, and has also been taken from bumblebees' 

 nests; Lcplinillus ralidus, which occurs on beavers in the Hudson Bay region; 

 and Lyrosoma opaca, a silphid found in the North Pacific about the tenanted 

 nests of the murres. 



Oak pests. — The oak twig girdler (Agrilus politus), L. Childs (Mo. Bui. 

 Com. Uort. Cal., 3 (1914), No. 3, pp. 150-155, figs. 3).— The injury to live oak 

 (Qiicrcus agrifoUa) by the oak twig girdler is said to be very conspicuous, 

 the attacks upon the smaller twigs resulting more particularly in damage to 

 the appearance of the tree. The author's pruning exi)eriments in 1911-12 are 

 said to have proved conclusively that the injury can be almost entirely elim- 

 inated by occasional cutting out of the attacked twigs in individual trees even 



