Horn.] -^ [June 20, 



ately densely punctured, propygidium more coarsely and more densely 

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



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

 cisely with defectus. 



Occurs 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 front. Epipleurae narrow, unistriate, side 

 pieces of meso- and metasternum grooved. 



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

 Journ. A'., p. 50, pi. 4, fig. 1 ; Mars. Mon., 1851, p. 582, pi. 12, fig. 112 ; 

 ins, 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 striae, sutural stria extending in front of .middle, sub- 

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

 metasternum with a broad moderately deep groove. Anterior tibia? tri- 

 dentate. Length .1(3 inch ; 1 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 epipleura3, with the lateral groove of the thoracic side 

 pi( ces, at once distinguish this from every other Hister in our fauna. 

 ( >ccurs all over Europe and in the Middle States. 



Group Americanus. 

 Mesosternum truncate, epipleurae moderate, bistriate, side pieces of 

 meso- and metasternum not grooved. 

 El tra with two subhumeral striae. 



Outer subhumeral entire ; thorax unistriate sedecimstriatus. 



( >uter subhumeral short ; thorax bistriate 1 ambigena. 



Elytra without subhumeral stria. 



Elytra with five entire dorsal striae. 



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 striae, outer short. 



Four entire dorsal striae. Epipleurae bistriate .... nubilus. 

 Three entire striae, fourth short basal. Epi- 

 pleurae tristriate pollutus. 



Thorax with inner stria only. 

 Four entire dorsal striae. Epipleurae bistriate... relictus. 



