298 BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 



2121. [RiLEY, C.Y.] A butterfly larva injurious to pine-trees. <Amer. 



Nat., [2] December, 1882, v. 16, pp. 1015-1010. 



Habits and ravages of Pieris menapia on yellow-pine and tamarack in Wash- 

 ington Territory. 



2122. [RiLEY, C. Y.] The army-worm in 1882. <Anier. Nat., [2] De- 



cember, 1882, v. 16, p. 1017. 



Occurrence of Leucania unipuncta in great abundance and with disastrous 

 effects, especially in southern United States in 1882. 



2123. [RiLEY, C. Y.] The wheat-stalk worm on the Pacific coast. 



<Amer. Nat, [2] December, 1882, v. 16, pp. 1017-1018. 



Isosoma tritici injuring wheat-stalks in Washington Territory; reference to 

 prior notices of this insect. 



2124. [RiLEY, C. Y.] Deserved honor. <Amer. Nat., [2] December, 



1882, v. 16, p. 1018. 



Notice of the appointment of Eleanor A. Ormerod to be consulting entomolo- 

 gist to the Royal Agricultural Society of Great Britain. 



2125. [RiLEY, C. V.] Important work on Cynipidce. <Amer. Nat., [2] 



December, 1882, v. 16, p. 1018. 



Notice of G. Mayr's " Die europaischen Arten der gallenbewohnenden Cyni- 

 piden." 



2126. RILEY, C. V. Emulsions of petroleum and their value as insecti- 



cides. <Rural New Yorker, 9 December, 1882, v. 41, pp. 833, 

 834. S.-b. No. 42, pp. 17-18. 



Results of experiments made upon methods of using petroleum as an insecti- 

 cide without injury to plants ; soap and milk emulsions the most available ; 

 methods of preparing the same. 



2127. RILEY, C. V. The bean-weevil. <Rural New Yorker, 9 Decem- 



ber, 1882, v. 41, p. 835. S.-b. No. 42, p. 18. 

 Answer to inquiry of R. J. B. ; habits of and means against Bruchus fabce. 



2128. RILEY, C. Y. The " cluster-fly." <Prairie Farmer, 23 Decem- 



ber, 1882, v. 54, p. 7. S.-b. No. 42, pp. 16-17. Reprint : < Amer. 

 Nat,, [5] January, 1883, v. 17, pp. 82-83. 



Habits and synonymy of Pollenia rudis ; notice of other accounts of the swarm- 

 ing of Diptera. See No. 2174. 



2129. RILEY, C. V. Darwin's work in entomology. <Proc. Biol. Soc. 



Wash., 1882, v. 1, pp. 70-30. 



Analysis of the interest shown by C. R. Darwin in entomology and of his 

 contributions to the same. 



2130. RILEY, C. Y. The cotton-worm. <Western Farmer's Almanac 



for 1883, 1882, p. 40. S.-b. No. 42, p. 71. 



Various theories hitherto held in regard to the hibernation of Aletia argillacea 

 [=a;i/Hna]; proof of its hibernation; seasons and conditions of develop- 

 ment of the first brood of the year, precautionary measures to be adopted. 



2131. RILEY, C. Y. Pyretbrum, an important insecticide. <Western 



Farmer's Almanac for 1883, 1882, pp. 41-42. S.-b. No. 42, p. 49. 

 See : <Prairie Farmer, 27 January, 1883. S.-b. No. 42, pp. 56-58. 

 Condensed account of the history of the use of pyrethrum flowers as an in- 

 secticide; cultivation of the plants aud preparation of the powder; meth- 

 ods of its application ; experiments in the cultivation of the plants. 



