ECONOMIC ZOOLOGY ENTOMOLOGY. 247 



(Schistocerca pallens) in Yucatan. Numerous coccobacilli were found in the 

 intestines of all the dead locusts examined, but the organism could not be 

 detected in locusts captui-ed while in flight and belonging to swarms in which 

 the disease prevailed. Its cultural characteristics, etc., are described together 

 with ingestion experiments which prove it to have been the cause of the epi- 

 zootic. In inoculation experiments it was found to be nonpathogenic for hens, 

 guinea pigs, and rabbits. According to the information received by the author 

 from Yucatan planters, the number of locusts had so greatly diminished by 

 March, 1911, that it was estimated that the damage caused would be very slight. 

 The author suggests a possible usefulness for this organism in controlling 

 locusts in other countries. 



Destruction of the locust, J. Guelfreire (La Destruccion de la Langosta. 

 Mexico: Govt., 1911, pp. J.J, pis. 10). — An account by the Mexican Consul Gen- 

 eral of locust destruction in Argentina. 



Combating locust invasion in the Karst plateau region, F. Gvozdenovic 

 (Monat.^h. Land-w., 4 (1911), No. 1, pp. 12-2-i, figs. 10). — An account of the 

 invasion of some sections of the Department of Gorz and Gradiska, Austria, 

 in 1909, together with the measures used in combating it. An outbreak of dis- 

 ease due to Empusa gryUi took place toward the end of June and destroyed 

 large numbers of Caloptenus italicus and lesser numbers of si>ecies of other 

 genera. 



Studies of the parthenogenetic cycle of Heliothrips haemorrlioidalis, P. 

 BuFFA (Redia, 7 (1911), No. 1, pp. 11-109, pis. 3). — Following a brief intro- 

 duction, the author reviews the literature relating to this thrips in connection 

 with a bibliogi'aphy of 42 titles. A detailed account is then given of studies 

 made of its life history, bionomics, and geographical distribution. 



The hawthorn aphis (Aphis crataegi) as an enemy of apple trees, G. 

 LusTNER (Geiscnh. Mitt. Ohst. ti. Gartcnhau, 26 (1911), No. 5, pp. 11, 12; abs. in 

 Internat. Inst. Agr. [Rome], Bui. Bw. Agr. Intel, and Planf Diseases, 2 (1911), 

 No. 5, p. 1192). — An account is given of iujui-y to apple trees in various parts of 

 Germany by A. cratwgi. 



Organized efforts as a factor in the control of the citrus white fly, A. W. 

 Morrill (Jour. Econ. Ent., // (1911), No. .',, pp. 36J-37.5 ) .— This is an extended 

 discussion based on a general knowledge of citrus conditions in the Gulf Coast 

 States, gained by the author more particularly while connected with the U. S. 

 Department of Agriculture in the white fly investigations. 



The cotton white scale (" piojo bianco ") in Peru, C. H. T. Townsend (Bol. 

 Dir. Fomcnto [Peru], 8 (1910). No. 9. pp. 1-16; abs. in Internat. Ins't. Agr. 

 [Rome], Bui. Bur. Agr. Intel, and Plant Diseases, 2 (1911), No. 3, p. l-'i8). — 

 Of the insect enemies of the cotton white scale (Heniicliionaspis minor) 

 that have been introduced into Peru, Prospaltella aurantii and Aspidiotiphagus 

 citrinns are said to be the most beneficial. 



A contribution to the knowledge of the Coccidas of Argentina, G. Leonardi 

 (Bol. Lab. Zool. Gen. e Agr. R. Hcuola Sup. Agr. Portici, 5 (1911), pp. 237-- 

 28-'t, figs. 27). — Two genera, namely, Protai-gionia and Dinaspis, and 25 species 

 representing the subfamilies Monophlebinae, Ortheziinte, Dactylopiinse, Tach- 

 ardinge, Coccinfe, and Diaspiuse, are described as new to science. 



Diaspis pentagona, G. Gastine (Bui. Mens. Off. Rcnseig. Agr. [Paris], 10 

 (1911), Nos. Jf, pp. 432-456; 5, pp. 568-518).— A detailed account of Aulacaspis 

 (Diaspis) pentagona, its host plants, preventive and remedial measures, the 

 status of the pest in Italy, etc. 



Plants attacked by Diaspis pentagona (Bol. Min. Agr., Indus. & Corru. 

 [Rome], Ser. A, 10 (1911), II, No. 10, p. 314; abs. in Internat. Inst. Agr. 

 IRome], Bui. Bur. Agr. Intel, and Plant Diseases, 2 (1911), No. 4, pp. 968, 



