54 COLEOl'TEBA OF NORTH AMERICA. 



ever, without exceptions, as certain Dapti, Geopinus for example, 

 have a few squainules on the under side of tlie anterior tarsi, and 

 certain Acinopus have the anterior tarsi feebly dilated, and the 

 squaniules rudimentary. 



Grovip I. — Dapti. 



The genera of this group present certain special cliaraeters 

 which require passing mention. In the majority of the genera 

 the eyes are small, and beneath widely separated from the buccal 

 fissure. In Daptus, Polpochila, Ayonoderus, and Pogonodaptua 

 the eyes are normal in form, and close to the mouth beneath. 

 The mandibles of Geopinu)^, Daptus, and Pogonodaptus are 

 normally decussating, the left overlapping the right with its tij) 

 somewhat chisel-shaped and deeply strigose in the first two genera, 

 acute and not strigose in the third. In all the otiier genera men- 

 tioned below, the right mandible appears to be shorter than the 

 left, and is capable of being drawn more within the mouth, its 

 chisel-shaped tip passing along the obtuse inner edge of the left 

 reminding one of the form of the articulation of the lower mandible 

 of the Parrot on the upper, or like the incisor teeth of a Rodent. 



Daptus has also a small triangular plate over the insertion of 

 the antennjfi as observed in Ditomus. 



The anterior tibiae are usually gradually dilated to apex and 

 spinous at tip externally, but in Geopinus the outer angle is 

 expanded in a plate, spinulose on its edge, resembling in general 

 form that of Glyptus. In Nothopus the outer angle is more 

 narrowly prolonged and rather deeply sinuate above the tooth. 

 Daptus has a thicker anterior tibia, the outer angle rounded, the 

 posterior face rather closely beset with spinules as in Phaleria, 

 indicating fossorial habits. 



The following table will enable pur genera to be recognized: — 



Mandibles prominent, decussating. Body subpedunculate. 



Mandibles deeply strigose at tip. Anterior tibise decidedly fossorial. 



Eyes small. Mentum with a seta at hind angles. Geopinus. 



Mandibles acute at tip, not strigose. Anterior tibiae not fossorial. Ino 

 scutellar stria. Head with deep arcuate impression each side. 



Pogonodaptus. 

 Mandibles not prominent, at most feebly decussating. Body not pedun- 

 culate. 

 Outer apical angle of ant(n"ior tibic-e prolonged. Nothopus. 



Outer apical angle of anterior tibise not prolonged. 

 Mentum toothed. 



