Horn.] — «^-J [Juue 20, 



atoly densely punctured, propygidiuni more coarsely and more densely 

 punctured. Length ,12-. 14 inch ; 3-3.5- mm. 



The sjjeeies, otherwise than in the above noted characters agrees pre- 

 cisely with defectus. 



C>ccurs in Maryland, South Carolina, Arizona, and in the West India 

 Islands. 



These last three species have the emargination of the mesosternum 

 reduced to a minimum, so that they approach the next group in which 

 the mesosternum is truncate. 



Group Bimaculatus. 

 Mesosternum truncate in fi'ont. Epipleuraj narrow, unistriate, side 

 pieces of meso- and metasternum grooved. 



H. bimaculatus, Linn. Syst. Nat. 1, Vol. 11, p. 567; Lee. Bost. 

 Journ. v., p. 59, pi. 4, fig. 1 ; Mars. Mon., 1854, p. 582, pi. 12, fig. 143 ; 

 ohliquus, Say. Journ. Acad.. 1825, p. 37. 



Thorax with a broad shallow impression at the anterior angles within 

 the stria. Side of thorax unistriate, stria fine and not entire. Elytra 

 with five entire striie, sutural stria extending in front of middle, sub- 

 humeral absent. Epipleuua3 narrow unistriate, side pieces of meso- and 

 metasternum with a broad moderately deep groove. Anterior tibiai tri- 

 dentate. Length .16 inch ; 4 mm. 



The elytra are black with that portion external to a line drawn from 

 the humerus to the tip of suture, red. The truncate mesosternum, nar- 

 row and unistriate epipleurai, with the lateral groove of the thoracic side 

 pieces, at once distinguish this from every other Hister in our fauna. 

 Occurs all over Europe and in the Middle States. 



Group Americanus. 

 iSIesosternum truncate, epipleuras moderate, bistriate, side pieces of 

 meso- and metasternum not grooved. 

 Elytra with two subhumeral striae. 



Outer subhumeral entire ; thorax unistriate ^ sedecirastriatus. 



Outer subhumeral short ; thorax bistriate .' ambigena. 



Elytra without subhumeral stria. 



Elytra with five entire dorsal stria3. 



Thorax with two lateral striae, outer short. 



Surface smooth americanus. 



Surface distinctly punctured perplexus. 



Thorax with the inner stria only exaratus. 



Elytra with four entire dorsals or less. 



Thorax with two lateral stria?, outer short. • 



Four entire dorsal sti-iai. Epii)leura3 bistriate nubilus. 



Three entire striaj, fourth short basal. Epi- 



pleune tristriate pollutus. 



Thorax with inner stria only. 

 Four entire dorsal striae. J^pipleurse bistriate... relictus. 



