31 COLEOPTERA OF NORTH AMERICA. 



III. Humeral angles distinct, wings perfect, elytra abbreviated ; front 



tibise not sulcate, claws divaricate. METHIOIDES. 



Front coxal cavities angulated, widely open behind ; middle coxal 



cavities open externally ; front skort, eyes very large, coarsely 



granulated; oral organs atrophied. XVI. Methiiki. 



Tribe I.— DORCADIIIVI. 



This tribe, represented by numerous species in the Mediterra- 

 nean region of the Eastern continent, has but two representatives, 

 Plectrura and Ipochus, in our fauna ; the former, a brownisli 

 insect with rows of sliining tubercles on the elytra, which at the 

 ajjcx are prolonged into acute serrated cusps; the sides of the 

 pi'othorax are armed and serrate ; it is found in Oregon, Van- 

 couver, and Alaska. Ipochus, a very convex form, clothed 

 sparsely with long erect hair, with bands of white pubescence 

 on the elytra ; the prothorax rounded, not armed ; found in the 

 southern part of California. 



These two genera represent separate groups, the former, Dor- 

 cadia, having slender almost pointed palpi, and wide iutercoxal 

 process of 1st ventral segment; the latter, Parmena?, having the 

 palpi stouter, last joint oval, obliquely truncate, and the iuter- 

 coxal process of 1st ventral segment acute. 



The tribe is readily recognized by the absence of wing^, the 

 consequently short metasternum, and by the elytra having no 

 humeral angles; the large quadrate vertical front ; the support 

 of the labrum coriaceous and distinct. The ungues are divari- 

 cate, and the last tarsal joint long. The front coxal cavities are 

 widely angulated, closed behind ; the middle coxal cavities widely 

 open externally, with distinct trochantin. The eyes are coarsely 

 granulate. Habits epigaeal. 



Tribe II.— MO^'ILEMIXI. 



These are large species of black color, rarely (Monilema albo- 

 pictam White) varied with whitish pubescence ; the antenna; are, 

 however, always annulate. They are found in the interior region 

 of the continent, extending into Texas and Lower California. 



The characters of the tribe are: front large, quadrate, vertical, 

 support of labrum not visible ; wings none, metasternum short, 

 (dytra without humeral angles; palpi slender, last joint obtusely 

 pointed. 



