THE GENUS DENDROCTONUS. 
pronotum; but the frontal groove and tubercles are usually more dis- 
tinct, the head broader, and the mandibles stouter. 
In species 9 to 11 (subdivision B) the females have the declivity of 
the elytra somewhat flattened and shining and the interspaces with 
Fig. 3.— The red turpentine beetle. Adult, lateral aspect, greatly enlarged: a, Pleural clavicula; 
b, pregena. (Author's illustration.) 
small granules and sometimes punctured. In the males the declivity 
is more convex, the interspaces have coarser granules, the head is 
broader, and the mandibles are stouter. 
