14 I P s ( T o m i c u s ■) p i n i Say, distal portion of maxilla. (Greatly 



enlarged) 



15 Xyleborus undes. sp., a, distal portion of maxilla. (Greatly enlarged) 



16 Ips pini Say, antenna (outer face). (Greatly enlarged) 



17 Xyleborus undes. sp. a, ventral view of prosternum. (Enlarged) 



18 Dryocoetes autograph us Ratz., ventral view of prosternum ; 



Ant., antenna (outer face); Gs., gular suture; C, forecoxa; Ps., 

 prosternum. (Enlarged) 



172 



