THE PINE INVESTIGATION. 



395 



Fig. LIX -Dendroctonus frontalis* ', adult, larva and pupa, a, front of 

 head; b, elitra, enlarged: c, pupa; d. larva: e, young larva just 

 out of egg; /. egg; g, mandbile; h, front of head. 



rougher and the frontal turburcles more acute on male than on 

 female; while the middle front of the female is usually more 

 convex and shining; back of head thickly covered with very 

 fine punctures ; antennae as in illustration; club in female slight- 

 ly broader and front surface more concave (dry specimens) 

 than in male; prothorax shining, but slightly narrower in front; 

 surface thinly covered with punctures of different sizes, 



Dendroctonus frontalis* Zi m m . Dendroctonus brevicornis, Lee. 



* BIBLIOGRAPHY. 



Zimmermann, Dr. C. 

 Le Cont, Dr. John L. 



Dietz, Dr. W. G. 



Hopkins, A. D. 



tion. 



Chittenden. 



Trans. Amer. Ent. Soc. Sept., 1868, p. 149; 



Ibid, p. 173, Proc. Amer. Phila's Soc. Vol., X, 1876, p. 386, D. 



bremcornis described; further description of D. frontalis; cor- 



rection with reference to Bostrichus frontalis, Fab. mentioned 



by Zimmermann which=P/iloeo(ribus frontalis. Fab. 



North American Coleoptera. [author's extra] p. 32; further de- 



scription and connections with reference to D. bremcornis', Lee. 



which=Z>. frontalis. 



In Proc. Ent. Soc., Wash.; Vol. 11, 1892, p. 353. Reference to 



habits. 



In Science. Vol. XX, July 29, 1892. p. 64. Reference to de- 

 structive habits. 



Insect Life. Vol. VI. 1893, p 123; also 24th. An. Rep. Ent. 

 Soc. Ontario, 1893; pp. 71-76. Account of investigation, importa- 

 tion of enemy, and disappearance. 



Bull. 31. W. Va. Exp. Agr. Sta., 1893; p 143. No. 77. Habits. Host 

 plants, Parasites, collecting and breeding notes. 



Bull. 32. W. Va. Exp. Sta., 1893; p. 213. Host plants. 



Insect Life. Vol. V. 1893; p. 187. Account of investigation. 



Garden and Forest. Vol. VII, 1894; p. 348. 



Canadian Entomologist. Vol. XXVI, 1894. p. 288. Sexual 

 characters. 



Southern Lumberman, 1894. Hardwood. Vol. VI. No. 5, 1894 

 pp. 270-271. Timberman, 1894. State and county papers. Notice 

 of disappearance and ending of the trouble. 



Canadian Entomylogist. Vol. 28, 1896; p. 24. Reference to its 

 disappearance and the probability of disease being the cause. 

 Bull. No. 7. New Series, U, S. pep. Agric. Div. Ento., 1897 pp 72 

 73. Fig. 43. Brief accouut of information from correspondence 

 and observations by Mr. E. A. Schwarz. 



