250 



'nb. Ueber die Abhangigkeit der Fauna vom Gestein. Mem. 

 i er Cong. Internat. d'Ent, Bruxelles, 1910, 2:321-344. 



Holmes, S. J. 



'13. Note on the orientation of Bombilius to light. Science, 

 n. s., 38 : 230. 



Hopkins, A. D. 



'93a. Catalogue of West Virginia Scolytidse and their enemies. 

 Bull. W. Va. Agr. Exper. Sta., No. 31 : 121-168. 



'93b. Catalogue of West Virginia forest and shade tree insects. 

 Bull. W. Va. Agr. Exper. Sta., No. 32: 171-251. 



'99. Report on investigations to determine the cause of unhealthy 

 conditions of the spruce and pine from 1 880-1 893. Bull. W. 

 Va. Agr. Exper. Sta., No. 56: 197-461. 



'01. Insect enemies of the spruce in the Northeast. U. S. Dept. 

 Agr., Div. Ent, Bull. No. 28, n. s. 48 pp. 



'02. Insect enemies of the pine in the Black Hills Forest Reserve. 

 An account of results of special investigations, with recom- 

 mendations for preventing losses. U. S. Dept. Agr., Div. 

 Ent, Bull. No. 32, n. s. 24 pp. 



'04. Catalogue of exhibits of insect enemies of forests and forest 

 products at the Louisiana Purchase Exposition, St. Louis, 

 Mo., 1904. U. S. Dept. Agr., Div. Ent., Bull. No. 48. 56 pp. 



'06. The locust borer. U. S. Dept. Agr., Bur. Ent., Bull. No. 58, 

 Pt. I. 16 pp. 



'09. Barkbeetles of the genus Dendroctonus. U. S. Dept. Agr., 

 Bur. Ent., Bull. No. 83, Pt. I. 169 pp. 



Hopkins, C. G., Mosier, J. G., Pettit, J. H., and Readhimer, J. E. 

 '11. Moultrie county soils. Soil Rep. No. 2, 111. Agr. Exper. 

 Sta., pp. 3-38. 



Hopkins, C. G., and Pettit, J. H. 



'08. The fertility of Illinois soils. Bull. 111. Agr. Exper. Sta., 

 No. 123: 187-294. 



Howard, L. O. 



'91. The parasites of the Hemerobiinse. Proc. Ent. Soc. Wash., 



2: 123-124. 

 '92a. The Habits of Melittobia. Proc. Ent. Soc. Wash., 2: 244- 



248. 

 '92b. The hymenopterous parasites of spiders. Proc. Ent. Soc. 



Wash., 2: 290-302. 



