300 TRANS. ST. LOUIS ACAD. SCIENCE. 



Vertex and pronotum trifoveate, body broad, 

 each elytron with a long^ discal line, antennae 

 with a 3-jointed club, undersurface of the head 

 unicarinate ..... Bryaxis Leach 



Vertex bifoveate with a transverse frontal im- 

 pression and obsolete circumambient sulcus, 

 prothorax trifoveate, only the last antennal joint 

 enlarged, body elongate - - Eupsenius Le Conte 



Vertex bifoveate, different in the sexes ; pro- 

 thorax unifoveate, elytral discal lines short, 

 body elongate - - - Verticinotus Brendel* 



b" Body more elongate, convex; abdominal margin 

 linear, narrow ; prothorax with faint punctiform 

 fovea or none. 



Vertex bifoveate, elytral lines wanting, abdo- 

 men at the base without carinse, antennal club 

 3-jointed - - - - Scalenarthrus Le Conte 



Vertex not foveate, elytral lines wanting, dorsal 

 abdominal base bicarinate, antennal club one- 

 jointed PsELAPTUs Le Conte 



Vertex with four faint fovccE, different in the 

 sexes ; prothorax bifoveate, with a flat basal 

 transverse sulcus ; elytral discal lines obsolete 

 or wanting ; sutural lines present, abdominal 

 basal cariucB present ; sexual differences in the 

 vertex, antennae and anterior tibitp ; tarsi with 

 two unequal claws - . - Artiimius Le Conte 



b' Body circulo-cylindrical, narrow elongate, very 

 convex ; abdominal margin with the edges not 

 parallel on each segment triangular the external 



* Verticinotus n. g. separated frcm Decarthron. The male was former!}' described as 

 Decarthron cornutuvt, the female as Bryaxis inor7iata. The genus contains till now two 

 species, one discovered in Iowa, the other in Florida, Last January I intended the name 

 Anchylarthron for this genus, which, being rather an improper designation, I retracted it 

 from being included in my publication through the American Entomological Society of Phi. 

 ladelphia. Notwithstanding it was published therein, probably by oversight. 



