42 GEODEPHAGA — CARABIDAE. 



Third joint of antennae mucli longer than fourth. 



Sphodrus, Clairv. 



S B, Claws toothed at base. 



Third joint of antennae longer than fourth. 



Pristonychus, Dej. 



2, Hinder pairs of tarsi furrowed on the outer-side. 

 Third joint of antennae scarcely longer than fourth ; 

 claws toothed. Ccdathus, Bon. 



II, Apical joint of labial palpi slightly hatchet- 

 shaped. 

 Third joint of antennae scarcely longer than fourth ; 

 hinder pairs of tarsi not furrowed, claws toothed ; thorax 

 rounded. Taphria, Bon. 



b. Tooth of mentum simple, pointed; apical joint of 

 palpi generally rather oval, somewhat truncate at apex ; 

 claws simple. Dilated tarsal joints in the male almost 

 quadrangular. Anchomenus, Er. 



c. Mentum scarcely or not at all toothed. Apical joint 

 of palpi spindle shaped ; thorax rounded ; claws smooth. 



Olisthopus, Dej. 



J5. Anterior tibiae thickened toward apex ; the dilated 

 tarsal joints triangular or heart-shaped. Claws simple. 



a. Mandibles very prominent ; dissimilar. 



Mandibles bent inward at apex only; the right one with 

 a little excision in middle, corresponding to a projection on 

 the left one; maxillae narrow ; mentum with a sharp, simple 

 tooth ; paraglossae very long ; apical joint of palpi oval, 

 truncate ; first joint of antennae longer than the rest. 



Stomis, Clairv. 



b* Mandibles not projecting much beyond the labrum. 

 I, One spine at the apex of the notch on the anterior 

 tibiae. 



1, Tooth of mentum simple ; anterior margin of 

 tliorax prominent in middle ; dilated tarsal joints 



extended inward. 

 Apical joint of palpi elongate oval, truncate. 



Platyderus, Steph. 



2, Tooth of mentum emarginate at apex ; labrum 

 straight in front, rarely emarginate, apical joint 



