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506. HOLDER, C. F. Insect migration. <Sci. Ainer., 1 April, 1899, 



p. 996, 1 fig. 

 Grasshoppers in the West. 



507. HOLLAND, W. J. Concerning tick*. <Can. Entom., April, 



1898, pp. 96-97. 



508. HOPKINS, A. D. Preliminary report on the insect enemies of 



forests in the Northwest. <Bull. No. 21, n. s., Div. Ent, 

 U. S. Dept. Agric., December, 1899, pp. 27. 

 Notes on the habits of many forest insects. 



509. HOPKINS, A. D. The San Jose or pernicious scale. <W. Va. 



Farm Reporter, 1897, pp. 84-86. 



510. HOPKINS, A. D. Entomology and the entomologist as related to 



horticulture and the horticulturist. <W. Va. Farm Reporter, 

 December, 1897, pp. 411-413. 



oil. HOPKINS, A. D. The periodical cicada in West Virginia. 

 <Bull. No. 50, W. Va. Agric. Exp. Sta., January. 1898, pp. 

 46, 23 figs., 1 map. 



Treats also of damage by tree crickets and woolly aphis. 



512. HOPKINS, A. D. On the history and habits of the "wood 



engraver" ambrosia beetle, Xyleborus xylographicus Say, 

 (Xyleborus saxeseni Ratz.), with brief descriptions of different 

 stages. <Can. Entom., February, 1898, pp. 21-29, 2 pis. 



513. HOPKINS, A. D. Insect enemies of the locust tree. <W. Va. 



Farm Review, March, 1898, pp. 88-93, 6 figs. 

 Notes on Odontota dorsalis, 0. nervosa, Cyllene robinise, and Prionoxystus robinix. 



514. HOPKINS, A. D. The San Jose scale in West Virginia. <W. 



Va. Farm Review, April, 1898, pp. 124-127. 



515. HOPKINS, A. D. Some notes on observations in West Virginia. 



<Bull. No. 17, n. s., Div. Ent., U. S. Dept. Agric., Novem- 

 ber, 1898, pp. 44-49. 

 Short notices of various species. 



516. HOPKINS, A. D. Insects detrimental and destructive to timber 



products. <Proc. 19th Ann. Meet. Spc. Prom. Agric. Sci., 

 1898, pp. 103-108. 



Treats of Scolytm 4-spinosus, Dendroctonus frontalis, )[?l<nto)thil<i falmi/nttfitu, 

 Agrilus Mlineatus, Lymexylon sericeum, Eupsalis mitiuta, Corthylus Columbia- 

 nus, Lydus striatus, and Phymatodes variabilis. 



517. HOPKINS, A. D. Report of the entomologist. <llth Ann. 



Rept. W. Va. Agric. Exp. Sta., 1898, pp. 32-40. 

 Summary of year's work. 



518. HOPKINS, A. D. Present outlook of the San Jose scale problem. 



<W. Va. Farm Reporter, April, 1899, pp. 76-79. 



