ECONOMIC ZOOLOGY ENTOMOLOGY. 357 



tion. The young aphidids, which become mature about the last of May, usually 

 disappear about the first week in June, supposedly to the roots of Douglas fir. 

 In the full part of the aphidids leave the roots and migrate to the ash and pro- 

 duce the sexual forms. 



A second species which has been imported into Oregon on red and white ash 

 has been identified by the author as P. humelice. Descriptions of the various 

 stages of P. fraxini-dipetaloe are presented, followed by a list of the Aphididae 

 infesting sage brush (Arteinesia sp.) in Oregon, consisting of 13 species, 6 of 

 which are described as new, and by descriptions of 9 additional new species 

 of apliidids, 7 of which are from Oregon. 



Confusion of Rliopalosiplium hippohaes and Myzus braggii, C. P. Gillette 

 {Jour. Eeon. Ent., 8 {1915), No. 3, pp. 375-379, figs. 21).— The difference in 

 these aphidid species Is pointed out. 



A schizoneuran migrating from elm to the apple, A. C Maxson {Ent. 

 Neics, 26 {1915), No. 8, pp. 367, 368). — The author presents evidence to show 

 that the migration of the elm cluster or elm rosette aphid to the apple takes 

 place in Colorado. He concludes that ScMzoneuva lanigera and the elm cluster 

 louse are the same, the latter being the spring form of the former. 



The woolly aphis as a pear pest, G. P. Weldon {Mo. Bui. Com. Hart. Cat., 

 4 {1915), No. 9, pp. Ui-iU, figs. 2).— Since August, 1913, when the woolly 

 aphis was found abundant at Martinez, Cal., on the roots of seedling trees in 

 the nursery row as well as on old trees of the Bartlett variety near by, 

 investigations throughout the State have shown that there are few places where 

 it does not occur. In some of the mountain districts of the State at least its 

 presence has resulted in quite severe injury to trees. 



Effect of low temperature on the oyster-shell scale (Lepidosaphes ulmi), 

 R. L. Webster {Jour. Econ. Ent., 8 {1915), No. 3, pp. 371-375, figs. 3).— The 

 author's studies indicate that a temperature of — 32° F. was too cold in Iowa 

 during the winter of 1912-13 for the eggs of the oyster-shell scale to survive. 



The Bermuda grass Odonaspis, J. Kotinsky {Proc. Ent. Soc. Wash., 17 

 {1915), No. 3, pp. lOl-lOJ/, figs. 2). — Odonaspis ruthce, which infests Bermuda 

 grass {Ci/nodon dactylon) in Honolulu, living mostly underground on the stem, 

 is described as new. 



Notes on the brown lace-wing' (Hemerobius pacificus), G. F. Moznettb 

 {Jour. Econ. Ent., 8 {1915), No. 3, pp. 350-35.',, pi. 1).—A more detailed ac- 

 count than that previously noted (E. S. R., 32, p. 651). 



This lace-wing was found to be particularly important in destroying the 

 oviparous females of the rosy apple aphis {Aj)his sorbi) and the currant aphis 

 {Myzus ribis). However, this species preys upon almost all species of Aphi- 

 didie, and during July, 1913, it was found quite abundant in hopyards feeding 

 upon the wingless females of the summer generations of the hop aphis and also 

 on the red spider of the hop {Tetranychus telarius). The larval period was 

 found to average 14 days. The life cycle at a temperature ranging from 60 to 

 80° F. during the day and from 40 to 50° at night required an average period of 

 38 days. Five larvge observed from December 11 to December 18 consumed from 

 24 to 27 aphidids each, or a total varying from 191 to 216 each. 



A new species of Stenares, N. Banks {Proc. Ent. Soc. Wash., 17 {1915), No. 



s. pp. m 145). 



The pupal instar of the fruit-tree leaf -roller (Archips argyrospila), G. W. 

 Herrick and R. W. Leiby (Canad. Ent., 47 (1915), No. 6. pp. 185-187).— A 

 tabular record of 227 pupse under observation during June and early July shows 

 the minimum length of the pupal instar to be 9 days and the maximum 16 days, 

 with an average of 12.6 days. 



