354 SCOLYTID^. 



[LeConte. 



12. P. conflnis, n. sp. 



Rather slender, piceous black, shiniug, (nearly glabrous V;. Eyes deeply 

 emarginate. Prothorax a little longer than wide, strongly asperate over a 

 circular space extending from the middle to the tip, coarsely punctured on 

 the rest of the surface; smooth dorsal line not elevated, obsolete in some 

 specimens; base finely margined. Elytra strongly punctured; punctures 

 here and there arranged in approximate rows, but confused towards the su- 

 ture; declivity retusc, but without cusps, concavity smooth, sutural stria 

 deeply excavated behind. Antennse and legs brown, of the same form as 

 in those above described. Pygidium, except when protruded, but 

 slightly visible from beneath; fifth ventral not longer than fourth, and not 

 emarginate. Length 2.5 mm.; .10 inch. 



(^. Head clothed with long yellow hair. 



9 . Head nearly glabrous, shining, punctured, with a large, obtuse eleva- 

 tion on the vertex. 



California; Mojave Region, Mr. Crotch. Nearly allied to the next species 

 but more coarsely sculptured. The head of the male is retracted to such 

 an extent that I cannot see distinctly whether it is excavated or flat, but I 

 think the latter is the case. 



13. P. nitidulus. Bostrichus nit. Mann., Bull. Mosc, 1843, 298; 1846, 

 359; Cryphalus nit. Lee, Trans. Am. Phil. Soc. 1868, 157; C. atraiulus 

 Lee, ibid., 156; 't P. cribripennin Eichhoft', Berl. Enl. Zeitsch. 1868, 274; 

 ibid., 1871, 137. 



(^. Head flat, finely punctured, not opaque; clothed with long, erect 

 yellow hairs. 



9 . Head much less hairy; elytra more retuse behind. 



Alaska and California. Examination of a larger series of specimens indi- 

 cates that the synonym was founded upon a slight individual variation in 

 the form of the prothorax. Length 2 mm.; .08 inch. 



14. P. puncticollis. Cryphalus punct. Lee. Trans. Am. Ent. Soc. 1874, 

 71. 



California, one (^. Closely related to P. nitiduhis, and with the same 

 sexual ditferences, but much smaller, and of a reddish brown color, with 

 the rows of punctures on the elytra more distant, and a little finer. Length 

 1.5 mm.; .06 inch. 



15. P. lautus Eichhoft; Berl. Ent. Zeitschr, 1871, 135. 



A very small specimen from Texas closely resembles P. puncticollis, but 

 the asperities of the prothorax are arranged in four or five transverse rows; 

 the punctures of the rows of the elytra are larger, and the rows are better 

 defined; the declivity as in that species is retuse, and deeply sulcate along 

 the suture. Length 1.5 mm. .06 inch. 



16. P. puberulus Oryplialus pub. Lee, Trans. Am. Ent. Soc. 1868, 157. 

 One 9, District of Columbia; Mr. Ulke. Easily known by the very small 



size and erect pubescence. The elytra are finely and densely punctulate, 

 and not retuse behind, though the sutural stria is deeply impressed. Length 

 less than 1.5 mm.; .06 inch. 



