Tech. Series 17, Part I, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate VI 



Dendroctonus Adults. 



Fig. 17. — D. obmiig. Fig. IS.— D. rufipennis. Fig. 20. — D. punctatus. Fi.s:. 21. — D. micans. 



(OriginaL) 



