Ml TIM-: < AN.VniAX KXToM(H,<M!lST. 



There is a smaller form belonging to ihis subgenus which may be 

 obesus I-ec. but which is constantly much smaller than the length, 3 mm., 

 given by 1 >r. LeConle. Among many specimens of this smaller form 

 collected in (Quebec and New York State I find no considerable variation 

 in size, 2^^-232 mm. long. I present hero a description of these small 

 specimens as X. obesta, variety minor. 



Xyltborus obesus, variety minor. — Female: Length, 23^-2)^ mm.; 

 width : length :: 60: 137 (average of pinned specimens.) Front convex, 

 punctured and sparsely hairy, with tpistomal fringe, median carina 

 very faint. Pronolum, outlined from above, slightly wider than long 

 (60:50-55), truncate behind, very slightly rounded on the sides and 

 very broadly rounded in front ; asperate in front and sparsely punctured 

 behind, with the faintest trace of a median carina ; sparsely hairy. 

 Elytra : width : length :: 60 : So (average); hairy, slender hairs from 

 the interspaces ; rows of punctures very s-lightly impressed, noticeably 

 so on the declivity ; punctures of the rows more widely spaced than in 

 dispar, the distance between the punctures in the rows usually greater 

 than the diameter of tiie punctures ; the interspaces wide, with irregular, 

 very fine jninctures rei)laced by minute granules behind ; the seventh 

 interspace ridged behind and forming the ventral margin of the declivity, 

 as in (fisj>ar, but with a few acute granules. 



Male : 'I'he front is sparsely punctured and with long hairs. The 

 carina is slightly developed. The epislomal fringe is longer and thinner 

 than in serratns ( r? ). The asperations of the pronotum are sparse but 

 well developed ; the caudal half is punctured as usual, but the smooth 

 median space is absent in my specimens ; the outline from above is 

 broadly rounded in front and behind, more strongly narrowed in front 

 than in serratus ( S ). J>nt not so strongly as in i/is/>ar ( J ) ; sparsely 

 hairy, as in serratus. Klylra much as in serratus (J ), hairy, and with 

 rows of widely spaced punctures. In Jhtu/a /utea, li. popu/i/o/ia, Acer, 

 diseased trees. .Montreal Island, St. Hilaire, ()ue.; Ithaca, N. \. 



Xyleborus dispar 1'. — Male : Length, 2 mm. Front nearly opatjue, 

 punctured and hairy, much as in serratus ( ^ ), but with the median carina 

 of the V distinct. The pronotum is coarsely asperate in front, but 

 slightly less so than in the V . punctured behind, and with a distinct 

 smooth median space. The long hairs are developed only on the sides, 

 the hairs of the disk being very short. The outline of the pronotum from 

 above is strongly narrowed in front and narrowly rounded. The elytra 

 also have the disk nearly naked, the long hairs forming a fringe around 



