CERAMBYCID^E 271 



slightly oblique; punctures coarse and close-set, becoming small 

 apically; supplementary apical dorsal segment very broadly arcuato- 

 truncate and obtuse. Length (cf ) n.o mm.; width 3.6 mm. Penn- 

 sylvania biforis Newm. 



Body still more slender, with the elytra more rapidly cuneiform, more 

 acute at apex, with nearly similar truncatures; color pale luteous, the 

 metasternum blackish, the prothorax mottled blackish and dusky 

 rufous, the head black and the elytral spots as in biforis; head densely, 

 subrugosely punctate, the tempora subangulate; antennae not quite 

 so long and rather more slender; prothorax nearly similar but nar- 

 rower, longer than wide; elytra as coarsely but much less closely 

 punctate; supplementary segment, behind the last dorsal, obtusely 

 but abruptly lobed at the middle of its hind margin; abdomen densely 

 punctulate though rather less densely than in biforis. Length (cf ) 

 9.8 mm.; width 3.0 mm. New York (Bluff Point on Lake Cham- 

 plain) laurentica n. sp. 



It would be almost a certainty that Lept. gnathoides of LeConte, 

 belongs to this subgenus, were it not that the antennae seem too 

 short and heavy; in coloration it agrees with the four species above 

 assigned to it. 



Group V. 



Subgenus Trachysida nov. 



This subgenus, which is very isolated in the general habitus of the 

 body, due to the slender form, truncated conical or trapezoidal 

 prothorax and prevalence of dense subasperate sculpture, contains 

 at present, so far as known to me, but three species, mutabilis Newm., 

 and as per a and pedalis of LeConte. Mutabilis the type of the 

 subgenus is composite, as we have it in our collections, but as the 

 forms are closely allied, large and carefully collected series will be 

 necessary before coming to any definite conclusion. One pair from 

 Marquette, Mich., in my collection, for instance, is of larger size 

 and rather thicker neck than another pair from Bayfield, Wise.; 

 another, a female, from Wales, Maine, has looser punctuation, a 

 transverse prothorax, very thick neck and fuller tempora than any 

 other, and finally, a good series from Framingham, Mass., given me 

 by C. A. Frost is of smaller size, shorter form and more pubescent 

 prothorax in the male. The elytra may be entirely pale or black 

 in all of these subdivisions, this being an asexual peculiarity as in 

 Leptacm&ops . Quadricollis of LeConte, also probably enters this 

 subgenus but I have not seen it. 



