THE GENUS DENDROCTONUS. 
11 
In species 14, 15, and 19 the front has a transverse elevation, but 
in 17 it is absent or indistinct. 
In species 22 and 23 the dorsal plates of the 8th and 9th segments 
have prominent spines, and the front of the head is without elevations. 
THE PUPA. 
The pupa (fig. 5) is of the general color of the larva, but is of the 
general form and size of the adult, with the legs and wing pads folded 
beneath the body and the abdominal segments exposed. The 9th 
segment has two prominent fleshy spines, and the other segments are 
