Bui. 48, Div. of Entomology. U. S. Dept. of Agriculture. 



Plate XII, 



Fig. 1.— Cocoons of Bracon simplex, a 

 Parasite of the Spruce-destroying 

 Beetle. 



The cucooii^; 111 llmroii yiiiiitli.r. in tli«; larval 

 Inim.'.Sfif III lull nrliiii 11.1 iiiriiiurrilil. art' >ll<iwil 



at 'I. (Fnini Hnl .'>. ii. >.. I>iv. <»l Kiiloiuol- 

 ogy, L'. S. bupt. of AKriiullurc.) 



Fig. 2.— Work of the Pine-destroying 

 Beetle of the Black Hills. 



II. I'ilrh intii's nn snrfar*' nf bark, iiiiifli ro- 

 iliiccil; h, saiiic. t\vi>-thiri1.>i iiaiiiral size. 

 I From Yi'arUxtk, V. S. I)i'iit. of AKrifiiltiire. 

 \W2. ) 



