382 COLEOPTERA OF NORTH AMERICA. 



Of the above genera, Phthora, Merotemnus, Mycotrogus, 

 Aphanotus, Metaclisa, and Cynieus are found in the Pacific 

 region, the others in the Atlantic region. This tribe through 

 Evoplus and Ulosonia approaches the Diaperini. 



Tribe IX.— HETEROT ARSIBfl. 



This tril)e contains a few winged species of small size, and ovate 

 form;, they are remarkable for the coai'seness of the punctures, 

 and are sparsely clothed with erect hair. 



The head is not received in the thora.x as far as the eyes, which 

 are large and coarsely granulated ; the front is slightly dilated 

 over the base of the mandibles; the labruni articulates with the 

 epistoma without any intervening clypeus ; the antennae 11-jointed, 

 slightly thickened externally; the nientum is small; tlie epipleurae 

 are narrow and extend to the tip of the elytra. The anterior 

 coxae are globose, the middle ones have a distinct trochantin, the 

 hind coxae are slightly separated, and the intercoxal process of 

 the abdomen is triangular ; the legs are moderate ; tibial spurs 

 small ; tarsi clothed beneath with long pubescence, the penulti- 

 mate joint somewhat lobed. The hind margin of the third and 

 fourth ventral segments is subcoriaceous. 



Our genera are three: — 



Antonnse gradually thicker externally ; body i:)ubescent. Anaedus. 

 Antennae with the last three joints larger ; 



Margin of thorax denticulate ; body pubescent. Paratenetus. 



Mai-gin of thorax simple; body glabrous. Prateeus. 



Two species of Antedus are known in our fauna; one from the 

 Atlantic States, the other from the Gila Yalley. Paratenetus 

 occurs in the Atlantic States; it was placed by Spinola in Cle- 

 I'idas, and is omitted by Lacordaire ; Erichson referred it to the 

 present family. Prataeus occurs in the Atlantic region. 



Tribe X.— TRACIIYSCEEIXI. 



Body oval or rounded, usually winged ; head received in the 

 thorax as far as the eyes; front somewhat dilated at the sides, 

 covering the base of the mandibles; epistoma truncate, separated 

 from the prominent labrum l)y a short, coriaceous clypeus; eyes 

 transverse, scarcely emarginate, coarsely granulated ; antennse 

 slightly thickened externally; mentum small, inserted upon a 

 gular peduncle; ligula and maxillie exposed; palpi not dilated; 



