NORTH AMEKICAN COLEOPTERA. 285 



possibly be an introduced one, but I have been unable to identif}' 

 it. The Mexican species are certainly all different as the form of 

 niesosternuin would not have escaped the acute observation of Dr. 

 Sharp, unless that of C. posticatum is similar. 



PII.EIVOTVPUS Q. g. 



Mentum broader than long, slightly narrowed posteriorly, slightly 

 convex, sparsely punctate, finely transversely strigose, vaguely emar- 

 ginate in front. Maxillary palpi moderate, the pseudo-basal joint 

 slightly inflated, terminal joint a little longer than the preceding. 

 Antennae 9-joiuted, terminated by a compact, elongate oval, scarcely 

 flattened club, first joint as long as the club, the intermediate joints 

 together a little more than half that length. Prosternum extremely 

 narrow in front of the coxaj, forming a triangular area at middle 

 which is obtusely carinate. Metasternum slightly elevated along its 

 middle, prolonged between and entirely separating the middle coxjb, 

 meeting the metasternum and closely united with it, the latter form- 

 ing a pentagonal area. Suture betw^een the metasternum and its 

 episternum very slightly arcuate. First ventral segment carinate at 

 middle. Legs rather short. Tarsi shorter than the tibite, rigid ; the 

 first joint scarcely longer than the second. 



The above generic name is suggested for a species scarcely larger 

 than Creuiphihis mbcupreus, which presents some peculiarities for- 

 bidding its reference to any of the genera at present proposed. It 

 would have been referred to Perochthes, but Dr. Sharp a.sserts that 

 but four joints can be detected in the tarsi. 



If I interpret Dr. Sharp's meaning correctly, the antennal club is 

 compact and not loose, as in the foraily generally ; in fact, it resem- 

 bles in form and appearance the club of a Cuculionide rather than 

 a Hydro{)hilide. 



The meso-metasternal region does not difler greatly from that of 

 Dactylosternum, except that the two parts are more firmly and broadly 

 joined at their line of union, and the metasternal prolongation rela- 

 tively broader than usual in the Cyclonotum series. 



The joints of the tarsi are by no means easy to determine, and 

 from having at one time considered the number of joints four, I am 

 now able to figure the five. 



The mesosternal structure will readily separate the genus from 

 Phrenonotum, which has also the strongly arcuate lateral suture of 

 metasternum and no ventral carina. 



