127 



CC Declivity with the 3rd interspace tuberculate, 2nd unarmed except 

 at top of declivity, length less than 4 mm. 



D Punctures of pronotum rather sparse, variable in size, mostly 

 fine; declivity with one well developed, acute spine near 

 middle of 3rd interspace, with a second nearly or quite obsolete 

 below, the 2nd interspace nearly flat. 



fuscatus Eichh. Page 128. 



DD Punctures of pronotum close, variable in size, rather coarser 

 than fuscatus; declivity with three acute spines on 3rd inter- 

 space, the 2nd largest, the 1st well developed, and the 3rd 

 smaller to nearly obsolete; the 2nd interspace sulcate. 



impressus Eichh. Page 128. 



Xyleborus saxesceni Ratz.; Forstins. 1: 167, 1837 (Bostrichus). 



Length, 2-5 mm., slender. 



A species that is apparently identical in every way with our European 

 specimens of saxesceni Ratz. is represented in our collection from New York 

 State, Michigan and Indiana. It is not known to occur in Canada. (Xyle- 

 borinus Reitter). 



X. Arbuti Hopk. is distinguished from saxesceni by the shining declivity, 

 the length 2-4 mm., striae 1 and 2 impressed, punctures distinct, declivity 

 subconvex, shining, interspaces 1 and 2 elevated. Walker, Cal., in Arbutus 

 menziesii. This species may occur in the same host in British Columbia. 



Xyleborus xylographus Say.; Acad. Nat. Phil., Jour 5: 256; ed, Sec. 2: 318. 



So far as we can learn the type is not in existence and has apparently 

 not been seen since the time of Dr. Harris. There is a single metatype in 

 the Harris collection at Boston, labelled, " 744, N.C.", "Tomicus xylo- 

 graphus Say 744, teste Say." This specimen should apparently be accepted 

 as fixing the species. 



Length, 2-7 mm., rather slender, the pronotum rather strongly and 

 closely punctured behind, the punctures of varying size, the elytral striae 

 slightly impressed, strial punctures moderate, interstrial punctures smaller, 

 uniseriate, punctures distinct on the sides; declivity flattened, decidedly 

 opaque, the suture wide and slightly elevated, with about three widely 

 separated, small acute granules, the 2nd interspace flat, hardly impressed, 

 with small granules above the face of the declivity; the 3rd interspace 

 slightly elevated and granulate as upon the first. Would fall under " inermis 

 Eichh." in Hopkins' key to Xyleborus. 



Host trees. Probably various hard wood species. 



Distribution. New York state from Buffalo to New York City; New 

 Jersey; Wisconsin; Washington, D.C.; North Carolina; Virginia and 

 Missouri. Not known to occur in Canada. 



Xyleborus inermis Eichh. is very closely allied to and possibly identical 

 with xylographus Say. The lateral interspaces of inermis are described by 

 Eichhoff as " sparsely, lightly punctured." 



Xyleborus affinis Eichh. has the pronotum very lightly and sparsely punc- 

 tured behind, and is apparently distinct thereby. I have not recognized either 

 inermis or affinis from Canada or the Northern States. 



Xyleborus canadensis Sw.; Dom. Ent. Br., Dept. Agric., Bull. 14, 24, 1917. 



Length, 2-6 mm.; moderately stout, differs from xylographus chiefly 

 in the distinctly stouter form, the sides of the elytra parallel far beyond 

 the middle, hardly narrowed before the declivity, rather broadly rounded 



