THE GENUS DENDEOCTONUS. 



65 



Epistoma 



Clypeus 



Labrum-r-- 

 a- 



^-4^;^ 







Fig. 43.—Dendroctonus valens: Digestive organs of lan^a. V \\ ^•■'' T^ '.. '__^^n ecMl/ni 



A , Fore intestine; B, mid intestine; C, hind Intestine; nf]\fll/ -v i^*^ /' 



o, moutli; 6, anterior section of mid intestine; c, median ' vl r'^"^"""^ 



section; d, posterior section; e, small intestine;/, ececal lOth'^^^ 

 glands; g, anus; 9rt, ninth segment; WZ/i, tenth segment; \ (/ '^ 



h, base of the 2 malpighian tubules; i, base of the 4 \ 



malpighian tubules. (Original.) ^ 



