NORTH AMERICAN COLEOPTERA. 115 



Legs never verv stout, generally moderate, femora more or less 

 flavate, miitic ; tibiie unguiculate, posterior niucronate in Desmoris ; 

 tarsi slender, with the third joint bilobed in almost all the species, 

 fourth greatly differing in length, shorter than the three preceding 

 joints, except in Promecotarsus, where it is equal to the latter ; chiws 

 connate to a variable extent, greatest with the claws very small in 

 Smic'roi!tj.r proper, and some others, least in Promecotarsus. 



The vestiture of these insects consists of scales, of varying den- 

 sity, intermixed with squamiforni or hair-like scales. The sexes may 

 generally be distinguished by the formation of the beak and the 

 insertion of the antenn?e. 



SYNOPSIS OF GENERA. 



Foiutli larsal joiiit sliortcr than tlie three preceding joiuts conibiued, form va- 

 riable. Plate vii, fig.s. 4 and 4a. 

 Eyes not contiguous beneath. 



Anteiiiial club large, elonga,te, always distinct from the funicle. Plate vii, 



lijr. Irt Pacliypliaiies. 



Anteiinal club small, ovoidal, often subcontinuous with the fuuicle. Plate 

 vii, fig. ;5. 

 Eyes more widely separated beneath; posterior tibiae mucronate. Plate 



vii, figs. Srtcand oa Desnioris. 



Eyes narrowly separated beneath ; all the tibise unguiculate. Plate vii. 



figs. 3a and 5a Sniicronyx. 



Eyes contiguous beneath. Plate vii, fig. 3c Syiiertlia. 



Fourth tarsal joint about as long as the three preceding joints; form suhcy- 

 iindrical. Plate vii, fig. 46 Froiiiecotar^iiis. 



PACHYPH.4XES n. gen. 



The type of this genus is P. discoideus Lee, referred by LeConte 

 to PdcJnjfi/chlus Jek. The absence of the basal constriction of the 

 beak, and the simple, free claws, exclude the latter genus from the 

 tribe under consideration as already observed by Casey. 



Tile genus is characterized by the rather large, elongate antennal 

 club, the antenna' inserted two-fifths from the apex ( S ), or a little 

 i)efore the middle ( $ ). The species are stout, convex insects, beak 

 strongly curved, especially in the males, second joint of funicle lon- 

 ger than the third, strongly elongate in some of the species, outer 

 joints scarcely or very little wider, always distinct from the club. 

 Prothorax large. Elytra ample, convex, at most one-half longer 

 than wide. All the tibias distinctly unguiculate, claws rather snudl, 

 connate to a variable extent. 



TKANS. AM. ENT. .SOC. XXI. APRIL, 1894. 



