Bui, 48, Dpv, of Entomology, U S. Dept. of Agricultufe, 



Plate I. 



FiQ. 1.— The Pine-destroyinq Beetle of the Black Hills. 



a. Adult ticftlo, enlarged: h, ndiilt beetle, nntiiral size; c, liirvn; (/, piipm. 



FiQ. 2.— Destructive Pine Bark-beetle. 



a, Adnlt heotle. CTilftrRod; h, ndiilt, iiatiirftl size: r. jnipa, enlarged: (/, larva, enlarged; r, voting 

 larva, enlarged; /, egg, enlarged; ;/, larva, natural .'^ize. (After author, in Bulletin No. ."VJ, 

 West Virginia experiment station.) 



FiQ. 3.— Spruce-destroying Beetle. 



n. Dorsal view of ailiilt U-etle; b. side view of larva; r, dorsjil view of ptipa— all gn>atly enlarged; 



(/. natural .xize of beetle. 

 (From YearlxKjk. U. S. Dcpt. Agrieulture, 1902.) 



