12 BULLETIN 1490, U. S. DEPARTMENT OF AGRICULTURE 



Fig. 11. — Pinholes in the sap-wood of high-grade 

 cypress blocks ; end view of logs in freight car ; 

 wood completely riddled by ambrosia beetles 

 (Platypus compositus and XijWborus sp.) 



Fig. 12. — Pinholes caused by ambrosia beetles (Xyleborus sp.) in mahogany flitches 



