150 



COLEOPTERA OF NORTH AMERICA. 



Ventral segments 2-3 short, frst, fourth, and fifth longer. Carpophilus. 

 Ventral segments 1-4 short, fifth as long as the others united. Colastus. 

 Ventral segments 1-2 short, 3-4 longer, fifth still longer. 



Body depressed ; fifth ventral elongate, but not conical. Brachypeplus. 



Body elongate, fifth ventral long and conical. Conotelus. 



The last genus has an elongate form, and resembles certain 

 Staphylinidse. Tribrachys Lee, must be united with Colastus. 



Tribe III.— .ilTIDULIiVI. 



Elliptical, usually depressed, and frequently widely margined 

 species ; sometimes moderately convex, and even (Pocadius) 

 rounded. Distinguished from the preceding tribes by the elytra 

 covering the entire abdomen, or leaving only the pygidium ex- 

 posed, and from the next by the thorax not being movable over 

 the base of the elytra. All of our genera have antennal grooves 

 on the under surface of the head. 



These insects live on flowers (Meligethes), in fungi (Pocadius), 

 under bark and stones (Epursea), or on dried animal matter. 



Our genera are as follows : — 



Prosternum depressed behind the coxje, not prolonged. 

 Presternum elevated behind, often pi-olonged. 



2. Tarsi very distinctly dilated on all the feet. 

 Tarsi not dilated or very feebly so. 



3. Antennal grooves strongly convergent. 



Labrum bilobed. Males vrith a sixth dorsal segment. 

 Labrura feebly emarginate. Males without sixth segment. 

 Antennal grooves parallel, passing directly backwards. 



4. Mentum broad, covering the base of the maxillae. 

 Mentum not covering the maxillae. 



5. Front not lobed over the antennae. 



Mandibles with tip slightly bifid. 

 Mandibles not bifid at tip. 

 Front lobed over the insertion of the antennae. 

 Mandibles simple at tip, toothed posteriorly. 



6. Mesosternum not carinate. 



Head without antennal grooves. 



Anterior tibiae not toothed externally. 



Anterior tibi» bidentate at middle. 

 Head with distinct antennal grooves. 



Tarsi not dilated ; body oval, pubescent. 



Front tarsi dilated ; body parallel and glabrous. 

 Mesosternum carinate ; tarsi all dilated. 



Lobiopa Er. has been united with Soronia Er. 



2. 

 7. 

 3. 

 4. 



Epuraea. 



Nitidula. 



Stelidota. 



Prometopia. 



Phenolia. 

 Omosita. 



Soronia. 



Thalycra. 

 Perthalycra. 



Pocadius. 



Orthopeplus. 



Meligethes, 



