NORTH AMERICAN COLEOPTERA. 169 



This species is variable in the coloration of the elytra ; sometimes 

 these are in great part yellow, with a few scattered, small, rufocasta- 

 neous spots, or they may be irrorate with that color, or finally the 

 entire disc may be rufocastaneous with the sides and apex broadly 

 yellow. Those variations as remarked by Mr. W. F. Rogers amply 

 account for the many synonyms. 



Occurs from Massachusetts to Montana, and from these points 

 south to Florida and Texas. 



Group II.- MONOPLATI. 



Antennae 11-jointed. Prothorax usually narrower at base than 

 the elytra, either with or without ante-basal transverse impi-ession. 

 Anterior coxal cavities closed behind. Last joint of posterior tarsi 

 globosely inflated at tip, the claws appendiculate in our genera. 



Two characters neatly deflne this gf'oup, the closure of the anterior 

 coxal cavities and the globosely inflated apex of the last joint of 

 hind tarsi. The first of these characters will be found in many 

 groups, the latter ordy otherwise in the Qildionyches and Pseudo- 

 lampses, both of which have the coxal cavities open. 



The following genera occur in our fauna: 



Maxillary palpi slender; thorax not impressed at base; posterior tibife with a 



double terminal spur Plite<lroiiius. 



Maxillary palpi stout ; posterior tibife with one spur. 

 Posterior tibia* longitudinally hicarinate; thorax transversely impressed at 



base; body glabrous Pachyonychiis. 



Posterior tibise feebly unicarinate ; thoxax not impressed ; body hairy. 



Hypolanipsis. 

 These genera all belong to the Atlantic region. 



PH.EDROMUS Clark. 



Head short, transverse. Labrum rounded in front; maxillary 

 palpi slender, second joint obconical, third twice as long, slightly 

 broader at tip, fourth very small, more slender, acute at tip. Eyes 

 large, globular. Antennje filiform, but rather stout, first joint 

 clavate, arcuate, second short, oval, third shorter than first, joints 

 following gradually shorter, the last acuminate. Prothorax trans- 

 verse, apex squarely truncate, sides angularly dilated in front of 

 middle, disc little convex, subdepressed at base, without ante-basal 

 impressions ; scutellum very small. Elytra a little wider than the 

 thorax, sides subparallel, moderately convex, finely punctate. Legs 



TBANS. AM. ENT. SOC. XVI (22) < MAY, 1889. 



