166 AMERICAN COLEOPTERA 



all punctures much finer or nearly obliterated toward the apex, except those of 

 the sutural series. Presternum subimpunctate ; metasternum sparsely punctate 

 at sides, very finely and remotely toward the middle; abdomen very minutely 

 and sparsely punctate. Metasternum at sides longer than the first ventral seg- 

 ment ; middle coxae separated by distinctly less than half the coxal width. Legs 

 moderate. (PI. "v*, figs. 58 and 58a). 



Mode. — Front and middle tibise subsiuuate within at apex, the apical mucro 

 indistinct; fifth ventral unimpressed. 



Female. — Tibiae straight; fifth ventral not impressed. 



Length 1.5-1.8 mm. 



Hub. — Apparently occurs in every part of our territory, as will 

 lie seen from the following localities, which are represented in the 

 material before me: Massachusetts; Pennsylvania; District of 

 Columbia; Virginia; South Carolina; Florida; Michigan; Iowa; 

 Colorado; Montana; Southern California; Oregon; Washington; 

 British Columbia ; Alaska. 



In the ample series before me there is very little variation worthy 

 of notice, except in one particular. The prothorax is larger, and 

 especially wider in some examples, especially from the northwest : 

 but there are intermediates in this respect, and there appears to be 

 no good reason for attempting a division. 



Unrecognized Species. 



Canaliculata Mann. Alaska (Kenai). 



Debilis Mots. Pennsylvania. The description indicates a spe- 

 cies that is very close to, and probably not distinct from, serrata. 



Depressiuseula Mots. Northern States of North America. Per- 

 haps not different from elongata 



Ferruginosa Mots. Georgia. Identical with ferrugineaf 



Striatopunctata Mots. Pennsylvania. 



Spinulosa Mann. Sitka. 



nELAXOPHTHALVA Mots 

 This genus is far less homogeneous in its makeup than Cortiearia, 

 ami is capable of division into several tolerably well defined groups, 

 which may be regarded of generic or subgeneric rank, according to 

 the bias of the individual. Notwithstanding the very different 

 appearance of the extremes of the series, these groups form a 

 natural sequence, and the differences are, for the most part, those of 

 degree rather than of kind. I have, therefore, preferred to adopt 

 the lower estimate of their significance, the more so since this 

 course is in harmony with that pursued by the ablest European 



