THE GENUS PISSODES. 53 



Distinctive characters. — This species is distinguished from P. nemo- 

 rensis by its average smaller size, longer beak, less distinctly elevated 

 elytral interspaces, and the sides of the elytra more distinctly parallel, 

 but it is more distinctly separated by its habit and host. It is not 

 improbable that this is an example of the origin of species through 

 mutation and change of habit and host. 



Variations. — There is considerable variation in size, the length 

 ranging from 4.2 to 5.8 mm., but there is not very much variation 

 in the grayish-brown color or in form, sculpture, and vestiture. 

 In fact, it appears to be more constant in general character than 

 almost any of the other species. 



Host tree. — Cedrus deodara, in living branches, tops, and terminals, 

 causing serious injury. 



Distribution (Plate XX, fig. 11). — (Hopk. U. S.) Georgia: 'Eixperi- 



ment. 



12. Pissodes calif omicus n. sp. 



The type specimen is labeled "Type No. 7456, U. S. N. M.;" 

 name; " Pinus ponder osa; Yosemite Val., Cal., June 13, '04; Hop- 

 kins, Col[lecto]r; 9 4; Hopk. U. vS. 2808a." This specimen was col- 

 lected by the writer at the same time and place as those referred 

 to P. yosemite, and was not recognized at the time as distinct. 



Distinctive characters. — This species is closely related to P. nemo- 

 rensis, from which it is at once distinguished by the deeply emargi- 

 nate anterior margin of the pronotum and by its very different habit 

 and distribution. It is also readily distinguished from P. yosemite 

 by the broad, closely punctured pronotum with its emarginate 

 anterior margin and by the broad, flattened, third and fifth eh'^tral 

 interspaces. Indeed, it is so markedly different from any of the 

 other western forms that we feel justified in basing our conclusion 

 as to its distinctness on the single specimen. 



Host tree. — Pinus fonderosa, in thick bark on living trees, causing 

 serious scars. 



Distribution (Plate XX, fig. 12).— (Hopk. U. S.) California: 

 Yosemite Valley. 



13. Pissodes yosemite n. sp. 

 (Plate XVI, fig. JL.) 



The type specimen is labeled "Type Xo. 7434, U. S. N. M.;" 

 name; "Pinus ponderosa; Yosemite Val., Cal., June 13, '04; Hopldns, 

 Col[lecto]r; <? 1; Hopk. U. S. 2808b." The specimen was collected 

 near Mirror Lake in the thick bark of a tree which was apparently 

 dying from injuries by this and possibly the preceding species. 



Distinctive characters. — This species is more closely allied to P 

 webbi, from which it is distinguished by the narrower pronotum. 

 with the punctures less densely placed, and by its distribution. 

 57936°— U 5 



