1873.] -Oi [Horn. 



large majority of specimens. A variety occurs in the cabinet of Dr. 

 Leconte, bearing the manuscript name proximus in which the sides of 

 the thorax are scarcely at all punctured, the outer stria at its maximum, 

 and the prosternal lobe with the marginal line distinct. I feel unwill- 

 ing to separate it, however, as the characters are those which are the most 

 likely to be variable, and transitional forms in one or other character 

 constantly appear. A variety occurs in Oregon and Vancouver with 

 the outer thoracic stria half tlie length of the inner, the prosternum not 

 margined, and the form approaching remotus. These have been asso- 

 ciated with the latter species in cabinets, but tlie outer thoracic stria and 

 the unistrate epipleur* at once distinguish it. 



Occvirs from Canada to Georgia, and westward to Vancouver and 

 Oregon. 



Group Aboreviatus. 



Subhumeral stria interi'upted, often very short or even entirely absent. 

 Anterior tibue serrulate or mutic. This groui? and the folloAving may be 

 distinguished from the three which immediately precede by the inter- 

 rupted or even entirely absent subhumeral stria. This stria when present 

 may be represented by the basal or the apical portion, sometimes both 

 are present and are usually separated ; when they are united the union is 

 produced by the extension of a few punctures from the humeral portion, 

 which do not however join the end of the apical portion. The stria 

 never presents that straight continuous form of the preceding groups. 

 The subhumeral in the preceding groups is always the external, and is 

 more distant at apex from the first dorsal than the latter is from the 

 second. The subhumeral in this and the next group is internal, and 

 nearer the first dorsal than the latter is from the second, and when the 

 humeral appendix forms an union with the apical portion, as above indi- 

 cated, the basal tip of the latter always passes beyond this point in the 

 direction of the fine oblique humeral stria, which is really the continua- 

 tion of an internal subhumeral. 



The species of this group have the anterior tibiae sometimes multidenti- 

 culate, usually seiTulate and rai'ely nearly mutic, the serrulations being 

 composed of spinules, and' are indei)eudent of any denticulatiou of the 

 tibia itself. 

 Subhumeral stria apical, deeply impressed. 



Outer margin of anterior tibiie regularly arcuate, minutely 

 serrulate. 



Front flat ; anterior tibiai multidenticulate coenosus. 



Front with a moderate impression ; anterior tibiae finely 



quatlridentate punctifer. 



Outer margin of anterior tibiaj sinuate and multidentate. 



Subhumeral with humeral appendicular stria abbreviatus. 



Sxibhumeral entirely obliterated or with mere trace. 



Elytra 3-striate, outer thoracic ve^y short or absent. 

 Anterior tibiaj finely serrulate or mutic ; outer thoracic 



stria visible at apex civilis. 



