AMERICAN COLEOPTERA. 141 



Tribe XXVL— Platynini. 



AntennEe slender rarely (Perigona) slightly thickened, arising below a slight 

 frontal ridge, the condyle exposed, three basal joints glabrous, first joint not long, 

 second usually short rarely as long as the third in which case neither is elongate, 

 third moderate in length usually longer than the others, but rarely equal to or 

 shorter than the fourth. Eyes moderately prominent, close to the mouth beneath. 

 Head oval, rarely elongate, eyes not very distant from the thorax, two supra-orbital 

 setse, front slightly narrowed before the eyes, clypeus moderately prolonged and 

 with a setigerous puncture each side. Labrum moderately prominent usually 

 truncate in front and sexsetose, rarely deeply emarginate. Mandibles moderately 

 prominent, feebly arcuate, acute at tip, without external seta. Maxillae hooked 

 at tip, ciliate or spinulose within, outer lobe biartieulate, palpi moderate in length, 

 the terminal joint variable, rarely securiform. Mentum deeply emarginate, toothed 

 or not, basal membrane more or less prominent, ligula very variable in form, 

 bisetose in front, the paraglossse variable in form and extent of union with the 

 ligular, palpi moderate, the last joint somewhat variable in form, the penultimate 

 bisetose in front. Thorax variable, sides with a setigerous puncture, a second at 

 the hind angle when the latter is distinct or in front of the angle when it is obtuse 

 or rounded. Elytra margined at base, sides narrowly inflexed, margin entire 

 without internal plica, apex obliquely sinuate, sometimes deeply, or even barely 

 perceptibly, dorsal punctures usually present, rarely {Pristovychus) wanting, 

 surface striate, the eighth stria distant from the margin except, in Perigona. 

 Prosternum not prolonged at tip. Mesosternal epimera narrow. Metasternal 

 epimera distinct, posterior coxse contiguous. Legs slender, the femora sometimes 

 thickened, tibise slender, not sulcate externally, the middle and posterior slightly 

 ciliate externally, the anterior slender emarginate within, spurs moderate in 

 length. Tarsi slender, the joints often sulcate on their outer side the fourth entire, 

 emarginate or bilobed. Claws simple, finely serrate or pectinate. 



The males have the anterior tarsi with three joints feebly dilated and squamu- 

 lose beneath. 



The tribe as here intended is the equivalent of Lacordaire's Aneho- 

 menides from which however some genera have been removed, Loxo- 

 crepis and Monolohus to the Carabinae, Oxyglossus and Stcnognathus 

 to the Lebiini. 



As a part of the tribe, constitutintr probably a distinct group I would 

 suggest the addition of Antnrctia and Geohsenus and I entirely agree 

 with C. G. Thomson in adding Masoreim. I can not understand why 

 Chaudoir (Bull. Mosc. 1870), associates in a complex, (it can not be 

 called a tribe) Masoreus, the Tetragonoderides, Nemotarsus and the 

 Sarothrocrepides. 



Perigona seems also better placed here than elsewhere and appears to 

 be a lead towards the Trechini in the same manner that Olisthopus does 

 to the Lebiini. 



A study of the form of the ligula and paraglossae of those genera 

 which are acknowledged on all sides to be undoubted members of the 

 present tribe Flafynui^^ Calathm^ and Olhtliopus, seems to nie to show 



