BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 197 



1485. R[ILEY], C. V. 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], C. V. 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 l=Attacus~\ promethea; colors of imagos; food-plants of larvae; de- 

 position of eggs ; silk of little value. 



1487. [EiLEY, C. V.] 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. V. Ditching for young locusts. <Colman's Rural 



World, 14 June, 1876. S.-b. No. 10, pp. 1 71-172 ; 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 Calopienus spretus and 

 other locusts. 



1489. RILEY, C. V. Periodical Cicada, "17-year locust." <N. Y. 



Semi-weekly Tribune, 23 June, 1876, 3 figs. 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 brood ; figures of larva, pupae, and imago. 



1490. RILEY, C. V. Specific for Colorado potato beetle. <Colman's 



Rural World, 28 Jane, 1876. S.-b. No. 10, p. 160. Reprint, 

 with omissions : <N. Y. Tribune. S.-b. No. 14, p. 7. 

 Answer to letter of R. Barbonr ; directions for the use of Paris green as a 

 means against Dorypliora decemiineata. 



1491. RILEY, C. V. [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 Doryphora decemiineata into Belgium ; quotes tbe 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 

 Doryphora decemiineata will probably reach Europe if at all. 



1492. RILEY, C. V. [On 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. 



