654 EXPERIMENT STATION RECORD. 



which chinch bugs may be prevented from spreading from infested to unin- 

 fested fields. 



A note on two elm leaf aphids, Edith M. Patch {Jour. Econ. Ent., 6 (WIS), 

 No. 3, pp. 316-318, figs. 8). — The author here calls attention to the fact that 2 

 perfectly distinct and easily distinguishable species causing elm leaf curl are 

 present in the United States. One of these migrates to Pyrus and Cratiegus 

 vvhere it is known as the woolly aphid of the apple; this species extends from 

 the Atlantic to the Pacific coast. The second elm leaf species, which is present 

 in California and elsewhere in the Pacific States, appears to be identical with 

 a species recorded from England, Germany, Sweden, and elsewhere which has 

 been ascertained by European workers to migrate from Ulmus to Kibes and 

 is at present known as uhni (fodiens) of Europe. 



Aphid pests of Maine, II, Edith M. Patch (Maine Sta. Bui. 218, pp. 13-100, 

 pis. Jt, flys. 26).— Continuing previous work (E. S. R., 28, p. 60) this bulletin 

 deals with 16 species occurring on willows (Salicacse) of which 3, namely. 

 Pemphigus gravicornis, ChaiUj phnrus delicata, and Melanoxanthervum anten- 

 natum, are described as new. A brief discussion of aphid control follows (pp. 

 91, 92). Part 2 of a Food Plant Catalogue of the Aphidae of the World, which 

 lists the aphids attacking members of the willow family, is appended (pp. 



93-100). 



Preliminary report on the parasites of Coccus hesperidum in California, 

 P. H. TiMBERLAKE (Jouv. Ecou. Ent., 6 (1913), No. 3, pp. 293-303) .—While for- 

 merly one of the worst scale pests to citrus fruit in California, at the present 

 time C. hesperidurn it is of minor importance. Mention is made of a serious 

 infestation which occurred at Riverside, Cal., in the heart of a small tract over- 

 run by the Argentine ant (Iridomyrmex humilis), which it is thought may 

 have been brought about by their being attended by this ant. 



Five species of parasites of the soft scale are said to have been observed in 

 California during the past 2 years, which in the order of their probable effec- 

 tiveness, are as follows : Aphycvs sp. near flavus, Microterys flavus, Coccophagus 

 Iccanii, C. lunulatus, and Aphycus n. sp. near coquilletti. The Microterys and 

 sometimes Aphycus also are said to be attacked by no less than S hji^erparasites. 



Scale insects upon citrus trees and methods to be employed for their 

 control, L. H. Gough (Agr. Jour. Egypt, 1 (1912). No. 2, pp. 89-93, pi. 1).— Sev- 

 eral scale insects which occur in Egypt, particularly the Florida red scale 

 (Aspidiotus aonidnm) and the California red scale (A. aurantii), are the source 

 of considerable injury. 



Icerya purchasi in the Department of Alpes-Maritimes, E. Molinas (Prog. 

 Agr. et Vit. (Ed. VEst-Centre), 34 (1913), No. 20, pp. 625-629, figs. 9).— This is 

 a brief discussion of the occurrence of the cottony cushion-scale, which was first 

 discovered in this Department in February, 1911. 



Insect pests of the New Zealand flax: (Phormium), C. French, Jr. (Jour. 

 Dept. Agr. Victoria, 10 (1912). No. 12, pp. 120, 121, figs. 2).— The white mussel 

 scale (Phenacaspis eugenice) and the ivy or oleander scale (Aspidiotus hederce) 

 are the insects considered. 



A brief report on the piojo bianco of cotton, C. H. T. Townsend (Jour. Econ. 

 Ent., 6 (1913), No. 3, pp. 318-321). — This paper deals w^ith the white scale 

 (HemicJiionaspis ndnor), an account of which by the author has been pre- 

 viously noted (E. S. R., 28, p. 159). This scale has developed since 1905 into a 

 serious pest of cotton in the Department of Piura, Peru. 



The present paper deals with its arrival and spread; conditions encountered 

 in Piura, including enemies; importation, liberation, and distribution of ene- 

 mies; enemy work for the future; cultural control measures; estimated capacity 

 for damage in Piura ; and a piojo bianco quarantine. 



