'Tech. 



;s 17, Part I, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate VIII 



Dendroctonus Larv/e. 



Fig. 1. — D. brevicomis; la, spiracle, enlarged; 16, spiracle, greatly enlarged, showing simple 

 bifld processes. Fig. 10. — D. ponderosse, spiracle, greatly enlarged. Fig. 13. — D. pseu- 

 dotsugse, spiracle, greatly enlarged. Fig. 14. — D. piceaperda, spiracle, greatly enlarged. 

 Fig. 19. — D. murrayanx; 19a, dorsal aspect of abdominal segments 8 and 9, showing 

 plates; 196, anal aspect; 19t', 19d, and 19e, different aspects of spiracular tubercle, much 

 enlarged. Fig. 23. — D. valens; 23a, dorsal aspect of thoracic segments; 236, dorsal aspect 

 of abdominal segments; 23c, dorsal aspect of abdominal segments 8 and 9, showing 

 armed plates; 23rf, ventral aspect of thoracic segments; 23e, ventral aspect of abdominal 

 segment; 23/, anal aspect of abdominal segments 8, 9, and 10; 23(7, '^'ih, 23i, different 

 aspects of spiracular tubercles, moderately enlarged; 23j, spiracle and spiracular tubercle, 

 greatly enlarged. (Original.) 



