THE GENUS DENDEOCTONUS. 



119 



prominent toward the latter, 7 with two minute dorsal hairs, 8 

 smooth, 9 with prominent widely separated spines. Pupal type, 

 labeled "Hopk. U. S. No. 6444b." 



The usual variation in arrangement and number of minor spines 

 prevails, but the pupa of this species is easily distinguishable from 

 that of the following by its smaller size and the more prominent 

 dorsal, lateral, and pleural spines. 



Fig. IZ.—Dendroctonus simplex: Egg galleries and larval mines. (Original.) 



Larva. — In addition to the generic and divisional characters, the 

 front is convex, opaque, with the posterior angle obtuse, and the 

 middle with an indistinct transverse elevation, and transversely 

 rugose. The clypeus is prominent, shining, with a distinct median 

 impressed line and the apex broadly emarginate; the labium is short, 

 with the apex broadly rounded. The sternellar lobes of the thoracic 

 segments are prominent and with distinct foot calli. Larval type 

 labeled "Hopk. U. S. No. 6444b." 



Galleries (fig. 73). — Egg galleries longitudinal, slightly winding, 

 and sometimes branched and grooved on the surface of the wood, as 



