330 Coleopterological Notices. 



northward along the Pacific coast to Alaska. The two genera may 

 be distinguished essentially as follows : — 



Anterior tibiae acutely produced and prominent externally at apex. 



Euryiiietopon 

 Anterior tibiae normal, truncate at apex £iuiueiiastlis 



EIIRIHIETOPOIV Esch. 



In this genus the transverse metasternal groove is always deep 

 and strongly developed, but becomes a little finer in section III. 

 In this connection it should be stated that the relative length of 

 the metasternum and first ventral segment, which is of considerable 

 importance in separating the species, sometimes varies slightly with 

 sex, the first segment being a little shorter in the female ; this dif- 

 ference is however very insignificant, and does not affect the com- 

 parative measures as given in the table. 



The antennae are remarkably uniform in structure throughout, 

 but have a slightly more abrupt and broader club in the subgenus 

 Cryptadius. The elytra are often much wider at base than the 

 contiguous base of the prothorax, a character unknown in Emmen- 

 astus. 



The subgeneric sections may be defined as follows : — 



Apical margin of tlie head entire ; pronotal punctures coarse, deep and perfo- 

 rate, not at all scabrous or asperate I 



Ajjical margin of the head with two small, widely distant emarginations. 

 Emarginations angulate and narrow, receiving the upper ridge of the man- 

 dibles ; metasternum long ; wings always well developed ; pronotal punc- 

 tures fine, sliallow and slightly scabrous II 



Emarginations broadly sinuate, not receiving the mandibles, the upper ridge 

 of the latter finer, more external, less prominent dorsally and on a much 

 lower plane than the margin of the epistoma ; metasternum very short ; 

 hind wings completely obsolete ; pronotal punctures slightly coarser, each 

 puncture bounded externally by a fine acutely elevated longitudinal 

 carina HI 



It will be noticed that these three subgenera differ not only in 

 abruptly limited structural characters of unquestionable value, but 

 also in general habitus, the punctuation, for example, especially of 

 the pronotum, being of a distinctly different kind in each. The 

 species are rather numerous and may be distinguished as follows: — 



