124 



THE SCOLYTID BEETLES. 



The usual variation in number a'nd arrangement of minor spines 

 prevails in other specimens, but they are easily distinguished from 

 those of D. simplex by their larger size and less prominent dorsal, 

 lateral, and pleural spines. 



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

 front is opaque, except toward the apex, where it is more shining, 

 and the apex is subacute; the middle has a transversely rugose, 



elevation, slightly more ele- 

 vated and broader toward 

 the suture. The clypeus is 

 prominent, shining, and with 

 an impressed line from the 

 middle to the anterior mar- 

 gin, which is broadly emar- 

 ginate; labium short, with 

 the apex broadly rounded; 

 the sternellar lobes are mod- 

 erately prominent, with in- 

 distinct foot calli. Larval 

 type labeled "Hopk. U. S. 

 No. 22^." 



Galleries (figs. 75-77). 

 The egg gallery is longitudi- 

 nal, short, but slightly wind- 

 ing, sometimes branched, 

 slightly grooving the surface 

 of the wood, and deeply 

 grooved in the inner bark. 

 The larval mines and pupal 

 cells are exposed in the inner 

 bark, and the eggs are rather 

 closely placed in groups of 

 three to ten or more, but the 

 larval mines are separated 

 from the start and are usu- 

 ally extended for some dis- 

 tance from the egg galley. 

 The galleries of this species 

 differ from those of the one preceding by their larger size and shorter 

 form of the egg gallery and the much larger larval mines, which are 

 arranged in larger groups. 



Distribution (fig. 78). (Hopk. U. S.) Arizona: Chiricahua National 

 Forest, Flagstaff, San Francisco Mountains, Santa Catalina National 

 Forest. California: Fieldbrook, Guerneyville, McCloud, San Mateo 

 County (Big Basin). Colorado: Colorado Springs, Fort Garland, Gun- 

 nison National Forest, Indian Creek, Leavenworth Valley, Moffat, 



FIG. 77.Dendroctonus pseudotsugx: Section of log with 

 bark removed, showing brood galleries marked and 

 grooved on surface of wood. ( Original.) 



