822 Coleopterologioal Notices, VI. 



tinguishable hy sculptural features which appear to be virtually 

 constant and easily perceived, The characters made use of by 

 LeConte for the separation of palustris Scop. (=colon L.) and 

 geviinafus,a.re not at all satisfactor}', and there is every reason to 

 suppose that the species of Say, is identical with the one which 

 we have heretofore regarded as coIo7i Linn., on the authority of 

 Kirby and Schdnherr. On this h3'pothesis the American species 

 may be defined as follows : — 



Elytral intervals alternating botli in width and convexity, separated rather by 

 continuous striaj than by series of punctures. 

 The intervals differiug greatly in width but polished and coarsely and sim- 

 ilarly rugose throughout; strise well impressed and marked by a continu- 

 ous line of white squamules; elytra without trace of an aute-raedian 



squamosespot gemellus 



The intervals alternately slightly narrower, more depressed and much more 

 finely sculptured; rostral carina broad and feeble. 

 Elytra with numerous irregular condensed areas of pale scales through- 

 out, the usual spot before the middle not distinguishable; narrower 

 intervals clothed in great part with denser brown squamules. 



errans 

 Elytra each with a small spot of condensed squamules before the middle. 



alteriiaiis 



The intervals differing but slightly in width and convexity and similarly 



finely and rugosely sculptured throughout, the narrower intervals clothed 



in great part with darker brownish scales; elytra each with a condensed 



spot of pale scales before the middle ; rostral carnia fine, strongly elevated 



and entire canadensis 



Elytral intervals mutually' similar as nearly so and similarly clothed through- 

 out, separated by series of detached punctures; each elytron constantly 

 with a small pale squamose spot before the middle. 

 Serial punctures moderately large, rounded and less unequal among them- 

 selves. 

 Beak finely carinate throughout. 



Elytra about twice as wide as the prothorax, having numerous small 

 condensed spots of ochreous scales situated lietween the serial punc- 

 tures; form stout pinguis 



Elytra evidently less than twice as wide as the prothorax, the humeri 

 less exposed at base and the elytra more gradually declivous behind 



in profile; vestiture much less dense geminatiis 



Beak not carinate toward base; ehtra twice as wide as the prothorax, 



the sutural angles prominent oregonus 



Serial punctures very unequal in size and iinevenly spaced, the larger elon- 

 gate, deep, perforate and verj- conspicuous; elytra deeply notched at apex, 

 the sutural angles prominent perforatum 



