ECONOMIC ZOOLOGY — ENTOMOLOGY. 149 



genera of Triozinte and Carsidarinse, together with a general revised synopsis 

 of the genus Trioza, and a synopsis of tliis genus based principally on the 

 genitalia. Descriptions of 5 genera. 13 species, and 7 varieties new to science 

 are included. 



A new species of Aleyrodes living on the olive, F. Silvestei {Bol. Luh. 

 Zool. Gen. e Agr. B. Souola Sup. Agr. Portici, 5 {1911), pp. 214-225, figs. 13).— 

 A. oUvinus, which occurs in central and southern Italy upon the upper and 

 rarely upon the lower surface of olive leaves, is described as new. It is 

 parasitized by Prospaltella olivina, Enca/rsia elegans, and Amitus minervce, the 

 last-named being here described as new to science. Biological notes are 

 included. 



An account of Aphis brassicae and some of its parasites and hyperpara- 

 sites, G. Martelli (Bol. Lab. Zool. Gen. e Agr. R. Scuola Sup. Agr. Portici, 5 

 {1911), pp. 40-o-i). — Aphid ins brassicw and 5 species of syrphus flies, accounts 

 of which are here presented, are the more important enemies of the cabbage 

 aphis at Portici. 



Two Rhopalosiphum species and Aphis pulverulens n. sp., C. P. Gillette 

 (Jour. Econ. Ent., 4 {1911), No. 3, pp. 320-325, pi. 1). — A. pulverulens, col- 

 lected from Sym'phoricarpos accident alls at Fort Collins, Colo., is described as 

 new to science. 



Host index to California plant lice (Aphididae), E. O. Essig {Pomona Col. 

 Jour. Ent.. 3 {1911), No. 2, pp. 451-468). — A list of synonyms of California 

 plant lice is appended to this host list. 



Aphididae of southern California, VI, VII, E. O. Essig {Pomona Col. Jour. 

 Ent., 3 {1911), Nos. 1, pp. 400-403, figs. 4; 3, pp. 523-557, figs. IS).— A con- 

 tinuation of papers previously noted (E. S. R.. 25, p. 53). 



The natural enemies of the citrus mealy bug. III, IV, E. O. Essig {Pomoiui 

 Col. Jour. Ent., 3 {1911), Nos. 1, pp. 390-397, figs. 4; 3, pp. 518-522, figs. 3).— 

 A continuation of the paper previously noted (E. S. R., 24, p. 559). The author 

 here considers the coccinellid beetles Cryptogomus orbiculus, Scgmmis gut- 

 tulatus, S. sordidus, RliizoWus lopantluc, and Hyperaspis lateralis, and the 

 hymenopterous parasite Chrysoplatycerus splendens. 



Locomotion of certain young scale insects, H. J. Quayle {Jour. Econ. Ent., 

 4 {1911), No. 3, pp. 801-306). — Experiments on the power of locomotion of the 

 black scale, the red or orange scale, aud the purple scale are reported. 



" In the case of the black scale it was shown that about 4 ft. of ordinary 

 orchard soil is about the limit that will be traversed by the active young. . . . 

 The young red scale in attempting to ascend a small particle of earth falls 

 back again and this is repeated time after time. The same is almost as true 

 for the young purple scale. Where there is a fine mulch, therefore, the chances 

 of the young red or purple scale reaching an adjoining tree is practically 

 negligible." 



Notes on Coccidae, VI, VII, E. O. Essig {Pomona Col. Jour. Ent., 3 {1911), 

 Nos. 1, pp. 404-411, figs. 5; 2, p. 469).— A continuation of papers previously 

 noted (E. S. R., 24, p. 559). The author considers the frosted scale {Eulecandum 

 pruinosum) , Glover's scale, Lccaniodiaspis rufescens, and Orthezia artetnisiw. 



The parasites of Mytilaspis pomorum, P. Voglino {Ahs. in Internat. Inst. 

 Agr. iRome^, Bui. Bur. Agr. Intel, amd Plant Diseases, 2 {1911), No. 1, pp. 228, 

 229). —An account of the parasitic enemies of the oyster scale, which are prev- 

 alent in various parts of Piedmont, Italy, and have already checked its multi- 

 plication. 



Grasserie in silkworms, M. N. De {Agr. Jour. India, 6 {1911), No. 3, pp. 

 292-295, figs. 2 ) .—Experiments show that the younger worms are more subject 

 to attack by this disease than are the mature ones. More worms died when 



