ECONOMIC ZOOLOGY — ENTOMOLOGY. 859 



at Compton, Wbittier, Puente, and Hollywood, all situated in Los Angeles 

 County, Cal., and making up an area of nearly 150 square miles." 



In regard to its abundance the author states that between 40 and 50 adults 

 were counted on a single plant of A'icotiana glauca infested by the bean thrips 

 and that it is now almost impossible to collect II. fasciatus at Compton, where 

 this parasite was first discovered. 



A new insect pest (Trioza alacris), D. L. Crawford (Mo. Bui. Com. Jlort. 

 Cal., 1 (1912). No. 3, pp. 80, 87).— T. alacris, a gall-making psyllld. which for 

 more than 25 years has been known to attack and seriously disfigure the leaves 

 of certain ornamental shade trees all over I^urope, is reported to have made its 

 aitpearance in California, having been brought into the State on nursery stock. 

 Specimens in all stages, together with the disfigured leaves, were found by 

 O. E. Bremner, state quarantine deputy, on the ornamental laurel (Laiirus 

 noMlis) in the nursery yards at Oakland. The infested trees are said to have 

 been imported from Belgium several years ago. The pest has also been found 

 in Sau Mateo County on laurels. 



Two new aphids from California, W. M. Davidson (Jour. Econ. Ent., If 

 (1911), No. 6, pp. 559-562, figs. 9). — Hyadaphis iimbellulariw, taken from the 

 leaves of California laurel { UiiihcUuIdria calif ornica). and Cryptofsiphum ta- 

 hoense, which occurs in galls on leaves and flower or fruit stalks of at least 2 

 species of manzanita (Arctostaphylos pumilla and A. tomentosa) are described 

 as new to science. 



The white fly (Aleyrodes citri) in California, G. E. Merrill (Mo. Bui. Com. 

 Hort. Cal., 1 (1911), No. 1, pp. 14, 15). — A brief account of the occurrence of 

 this pest in California and the measures taken to eradicate it. 



The white-fly work at Marysville, G. E. Merrill (Mo. Bui. Com. Hort. Col., 

 1 (1912), No. 2, pp. 62, 63). — This is a brief account of an attempt to defoliate 

 infested citrus trees and other host plants by spraying with a mixture of 5 per 

 cent distillate in water with 6 lbs. of caustic soda added to each 100 gal. The 

 desired defoliating effect was not manifest at the time of writing, due appar- 

 ently to the dormant condition of the trees, but the larger part of the white-fly 

 larviB present was thought to have been destroyed through the action of the 

 spray, thus materially diminishing the possibility of spread of the insect. 



A new pest of saltbush: White fly (Aleyrodes atriplex n, sp.), W. W. 

 Froggatt (Ayr. Gaz. N. S. Walcfi. 22 (1911), No. 9, pp. T.'^T, 758, figs. 6).— A new 

 species of white fly found fee<ling upon saltbush, a valuable fodder plant, at 

 Broken Hill, where it covered the whole of the underside of nearly every leaf, 

 is described as A. atriplex. A tiny, yellow chalcidid, which was reared in con- 

 siderable numbers from this white fly, is thought to be a large factor in its 

 control under ordinary conditions. 



The Coccidse of Louisiana, T. C. Barber (Jour. Econ. Ent., Jf (1911), No. 5, 

 pp. .'iffS-Jf51). — In this second paper the author lists G5 species, including the 

 34 previously noted (E. S. R., 24, p. 456). 



A structural study of some caterpillars, W. T. M. Forres (Ann. Ent. ^oc. 

 Amer., S (1910), No. 2, pp. 9-'i-l.'i3, figs. I.'i3). — This paper presents studies made 

 of the external structure, particularly of the parts and setae of the head of 

 caterpillars. Attention is called to the fact that comparatively little attention 

 has as yet been given to the minute description of caterpillars. The author 

 finds that the characters of the head can be made out quite as easily from cast 

 skins as from killed material. The body can not be studied quite so well, but 

 at least the arrangement of the proleg hooks, and also the type of vestiture, 

 whether primary, secondary, or tufted, can be made out without trouble. 



An artificial key to the families of Freuat* and a classified bibliography are 

 included. 



