248 BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
1749. Riley, C. V. A new genus of ProctrotfUpidce. <Amer. Ent., 
February, 18S0 [v. 3], n. s., v. 1, p. 52, figs. 13-14. Review: 
<^lbid., December, 1880 [v. 3], n. s., v. 1, p. 293. 
Description and figures of Didictyurn [ = Sexaplasta ] zigzag n. g. et n. sp. 
reared from chrysalis of Aletia argillacea [= xylina,']. 
1750. Riley, C. Y. Agricultural advancement in tlie United States. 
<Farmer’s Review, 1880, v. 4: 4 March, p. 158; 11 March, 
p. 174. S.-b. No. 23, pp. 153-158. Notice: <Ibid., 4 March, 
1880, p.—. S.-b. No. 23, p. 150. Reprint: <Journ. Amer. 
Agric. Assoc., April, 1881, v. 1, pp. 47-54. Separate of re¬ 
print: <August, 1881, pp. 47-54. 
Suggestions for the organization of an agricultural association ; comparison 
of the relations of government to the advancement of agriculture in Eng¬ 
land, Germany, France, and the United States; necessary changes in the 
United States Department of Agriculture. 
1751. Riley, O. V. Parasites of the plum Curculio. <Farmer’s Re¬ 
view, 4 March, 1880, v. 4, p. —, 2 figs. S.-b. No. 23, pp. 169- 
170. 
Figures of'larva, pupa, cocoon, and imagos of Sigalphus curculionis; habits, 
variations, usefulness, and dissemination of the same; habits, colors, and 
seasons of Porizon [= Thersilochus] conotracheli. 
1752. [Riley, C. V.] Trapping the carpet-beetle. <Amer. Ent., 
March, 1880 [v. 3], n. s., v. 1, pp. 53-55, fig. 15. 
Figures larva, pupa, and imago of Anthrenus scroplmlarice ; food-plants and 
habits of imago and ravages of larva; importation, distribution, vernacu¬ 
lar names of and means against the same. 
1753. [Riley, C. V.] Silk-worm eggs: Silk culture. <Amer. Ent., 
March, 1880 [v. 3], n. s., v. 1, p. 55. 
Method of obtaining eggs of Sericaria mori and information on silk culture. 
1754. [Riley, G. V.] [Hickory Scolytus.] <Amer. Ent., March, 1880 
[v. 3], n. s., v. 1, p. 58. 
Occurrence of Scolytus quadrispinosus in Washington Territory. 
1755. [Riley, O. Y.] [Tenacity of life.] <Amer. Ent., March, 1880 
[v. 3], n. s., v. 1, p. 68. 
Resistance of Cleonus sp. to the influence of various insecticides. 
1756. [Riley, C. Y.] [Danais archippus .] <Amer. Ent., March, 1880 
[v. 3], n. s., v. 1, p. 73. 
Occurrence of a colorational variety on the island of Antigua. 
1757. [Riley, C. Y.] Reports of the U. S. Entomological Commission. 
<Amer. Ent., March, 1880 [v. 3], n. s., v. 1, p. 73. 
Method of obtaining the first report of the U. S. Entomological Commission. 
1758. [Riley, C. Y.] [Habits of the cotton-moth.] <Amer. Ent., March, 
1880 [v. 3], n. s., v. 1, p. 74. 
Request for information on the habits of the imago and the food-plants of the 
larva of Aletia argillacea \_=xylina~\ during March and April. 
1759. [Riley, C. Y.] Typlilodromus pyri. <Amer. Ent., March, 1880 
[v. 3], n. s., v. 1, p. 74. 
Reference to early account of the pear-leaf blister-mite. 
