BIBLIOGRAPHY OP ECONOMIC ENTOMOLOGY. 197 
1485. R[iley], C. Y. Persian insect powder. <N. Y. Tribune, 7 June, 
1876. S.-b. No. 10, p. 168. 
Answer to letter of G. W. Holmes; impossibility of prescribing means against 
unknown insects; Paris green unsuitable for protection of bearing fruit 
trees; pyrethrum recommended. 
1486. R[iley], 0. Y. Cocoons of silkworms. <N. Y. Tribune, 7 June, 
1876. S.-b. No. 10, p. 168. 
Answer to letter of A. R. Sprout; description of larva and cocoon of Callo- 
samia [ = Attacus'} promelhea ; colors of imagos; food-plants of larvae; de¬ 
position of eggs; silk of little value. 
1487. [Riley, C. Y.] Is Paris green absorbed ? <N. Y. Tribune, 7 
June, 1876. S.-b. No. 10, pp. 168-169. 
Answer to letter of M. F.; plants colored by certain tinctures placed at their 
roots; Paris green not absorbed into the tissues of plants in perceptible 
quantities, but neutralized in the soil. 
1488. Riley, C. Y. Ditching for young locusts. <Colman’s Rural 
World, 14 June, 1876. S.-b. No. 10, pp. 171-172; 203-204; 204- 
205. 
• Critical review of J. Stayman’s article on same subject; proper width and 
depth of ditches to check the march of unfledged Caloptenus spretus and 
other locusts. 
1489. Riley, C. Y. Periodical Cicada, “17-year locust.” <N. Y. 
Semi-weekly Tribune, 23 June, 1876, 3 tigs. S.-b. No. 10, pp. 
166-167. 
Occurrence of Cicada [= Tibicen] septendecim at Lexington, Va., in 1876; list 
of localities at which these insects will appear this year ; chronological his¬ 
tory of a broo<;l; figures of larva, pupae, and imago. 
1490. Riley, C. Y. Specific for Colorado potato-beetle. <Colman’s 
Rural World, 28 June, 1876. S.-b. No. 10, p. 160. Reprint, 
with omissions : <N. Y. Tribune. S.-b. No. 14, p. 7. 
Answer to letter of R. Barbour; directions for the use of Parisogreen as a 
means against Dorypbora decemlineata. 
1491. Riley, C. Y. [Inquiries concerning the Colorado potato-beetle, 
and Mayor Brown’s answer thereto.] <Trans. Acad. Sci. St. 
Louis, June, 1876, v. 3, pp. 170-172 Proc. 
Verbal communication; critical review of answer of Mayor Brown to inqui¬ 
ries of A. C. Hardy de Boislieu as to the means of preventing the introduc¬ 
tion of Dorypliora decemlineata into Belgium ; quotes the 6th Ann. Rept. 
State Ent. Mo., p. 16, showing that the fear of such introduction is not 
unfounded; inaccuracy of Mayor Brown’s opinions; manner in which 
Dorypbora decemlineata will probably reach Europe if at all. 
1492. Riley, C. Y. [Ou the ravages of young locusts in western Mis¬ 
souri.] <Trans. Acad. Sci. St. Louis, June, 1876, v. 3, pp. 179- 
180 Proc. 
Verbal communication ; alarming nature of the ravages of unfledged Calop¬ 
tenus spretus in western counties of Missouri at the present time ; probable 
future departure of the winged locusts: means to be adopted against the 
locusts now. 
