GNATHONCUS. 41 9 



Gnathoiictis, 



A, Elytra with abbreviated sutural stria; length 1\ lines. 



Pitch-black, shiny ; diffusely and strongly punctured ; 

 antennae and legs brown-red. Elytra with four dorsal 

 striae, reaching a little beyond middle ; anterior tiljiae 

 with from six to eight teeth. Not very common. 



G. rotundatus, 111. 

 1?. Elytra without sutural stria ; length 1 line. 



Pitch-black, shiny : antennae and legs pitchy-red ; apex 

 of elytra pitchy. Similar to G. rotundatus, but with ely- 

 tra more diffusely and finely punctured, the three inner 

 dorsal striae scarcely reaching middle, and sides of thorax 

 scarcely narrowed toward apex. Pare. G. iJunctu latus, Th. 



Sapriniis, 



A. Clypeus not separated from forehead by a ridge. 



a. Sutural stria abbreviated at base, not joining second 

 dorsal stria. 



J. Elytra shiny, diffusely punctured at sides and apex 

 only. 



Black, shiny. Thorax punctured at margins only ; 



humeral stria on elytra not joined to inner lateral stria ; 



anterior tibiae witli from seven to ten teeth. L. 2 — 2i 1. 



Common. S. nitididus, Payk. 



II. Elytra dull, closely punctured throughout, except 



at shoulder, apical margin and a common space on 



basal part of disc (traversed by second dorsal stria). 



Black, dull. Disc of thorax impunctate ; sutural stria 



on elytra ceasing nearly in middle of smooth space, third 



dorsal stria interrupted ; humeral stria not joined to inner 



lateral stria, punctuation at base reaching second dorsal 



stria; anterior tibiae with four or five teeth. L. 2 1. 



Scarce. S. immundus, Gyll. 



J), Sutural stria on elytra united at base to second 



dorsal stria. 



I. Disc of thorax and a sharply defined space on 

 basal half of elytra impunctate. 

 Metallic-black, shiny. Third dorsal stria on elytra very 

 short, humeral stria not joined to inner lateral stria, latter 



E E 2 



