58 Indi'iu Economic Entomology. [VoL 11, 



into a sort of basin, in order that water may collect there. Weeding- 

 too has the efFeet of bringino^ the root-lice nearer to the surface and thus 

 making- them more easily reached by the hot water, but lime or ashes 

 should be mixed with the earth. Melted resin, mixed with an equal 

 quantity of fish oil, put on the infested spots, whilst warm, with a brush* 

 also applications of spirits of tar, turpentine, urine, kerosine, soft soaps, 

 and other similar substances, have been recommended, but there is little 

 doubt that the kerosine emulsion fulfils the same purpose quite as 

 effectually. 



The following- works may be consulted with advantage on the life- 

 history of this insect : — 



Buckton, G. B.: — 'Monograph of the British Aphides,^ iii, 1881, 

 p. 89, t. 105, 106, f. 1 to 6 : Ent. aMon. Mag., xx, p llO. 



Oomlock, J. H. : — Report, Department Agriculture, United States, 

 1879, p. 258. 



Girard :'~''E\x\\. Insect. Agri., ix, 1884, p. 119, f. 11. 



Goethe, R. : — Landwirthschaftliche Jahrb., 1883. 



Hausmami, F. : — -Beitrage zu den raaterialien fiir eine kunstige bear- 

 beitung der gattuug der Blattlause, in llliger's Mag. Insekt., i, 1802, 

 p. 426. 



Kessler, H. #..— Deutsche Eat. Zeitschrift, xxvii, 1823, p. 26; Ber. 

 Ver. (Jassel, 1883, p. 90; Kosmos, xv, 1814, p. 457; Nova Acta Leop. 

 Carol., xlvii, 1885, p. 107, t. xi; S. B. Verb. Zool.-bot. Ges. Wien, 

 XXXV, 1885, p. XXV ; 'Die Entwickelungs — und Lebens-geschicte der 

 Blutlaus, 8. lanigera, Hausm. Cassel, 1885. 



Lichtenstein, J. : — Migrations of plant-lice, Ent. Mon. Mag., xv, 

 1878, p. 134, 166; ib., xx, 1883, p. 7y. 



Thomas, C. : — Eighth Report of the State Entomologist on the 

 noxious and beneficial insects of the State of Illinois, p. 126. Spring- 

 field 111., 1879. 



Bolt, F. : — Memoire sur le Puceron lanigere et sur les moyens de le 

 detruire, Caen, 1831. 



^«o?i.-— Programme et resume des observations et des memoires 

 presentes a la saciete d' Agriculture de Caen pour la destruction du pu- 

 ceron lanigere, Caen, 1830. 



Anon. — Moyen de detruire le puceron lanigere ; — Ann. de V Agiie. 

 rran9., (2 s.) xliv, 1828, p. 380. 



