1873] ^'^^ [Horn. 



H. sedecimstriatus, Saj'. Journ. Acad., 1825, p. 36 ; Lee. Bost. 

 Journ. v., p. 57, pi. 3, fig. 9 ; Mars. Mou., 1854, p. 285, pi. S, fig. 84. 



Thorax with the internal lateral stria entire. Elytra with five entire 

 sti'iiB, deeply impressed, the fifth arching at base, and joining the sutural, 

 two subhumeral striae, outer entire, inner more deeply impressed ternii- 

 nating at humerus, but continued by the fine oblique humeral . Ejii- 

 pleune bistriate. Proiiygidium coarsely and sparsely punctured, 

 pygidium nearlj'^ smootli, very minutely punctulate. Anterior tibiae 

 finely tridentate, apical tooth finely bifid. Length .16 inch ; 4 mm. 



Middle States and Canada. Abundant. 



H. ambigena, Lee. Proc. Acad., 1859, p. 313. 



Inner thoracic stria entire, outer abbi-eviated, extending nearly to the 

 middle of thorax. Elytra with five entire stride, fifth arching and join- 

 ing the sutural, two subhumeral striaj, finely impressed, equal in length, 

 and extending slightlj'^ in front of middle. Anterior tibite finely 4-den- 

 tate, apical tooth bifid. Propygidium and pygidium very sparsely and 

 not coarsely punctured, the latter smoother at apex. Length .14 inch; 

 3.5 mm. 



One specimen, Vermont. 



H. americanus, Payk. Mon. p. 31, ^A. 9, fig. 1 ; Lee. Bost. Journ. 

 v., p. 56, pi. 3, fig. 7 ; Mars. Mon., 1854, p. 575, pi. 10, fig. 138. 



Thorax with inner stria entire, outer a))breviated, rarely more than an 

 arc at the anterior angle. Elytra with three entire strife, fourth very 

 slightly abbreviated, fifth curved at base 'and very rarely joining the 

 sutural, stripe finely impressed. Upper surface smooth. Epiplenra) 

 bistriate. Propygidium coarsely but sparsely punctured, pygidium more 

 finely punctured and nearly smooth at apex. Anterior tibiai tridentate, 

 apical tooth prominent, and finely bifid at tip. Length .12-16 inch : 

 3-4 mm. 



Occurs abundantly from Canada to Georgia and Kansas. 



H. perplexus, Lee. New Species, 1863, p. 61. 



Closely allied to the preceding species, and difiering in the following 

 slight characters : Surface s^jarsely and finely punctured. Elytra with 

 three entire striaj, fourth very slightly shorter, fifth equal to the fourth, 

 and joining the sutural. Stria; rather strongly impressed and punctured. 

 Length .16 inch ; 4 mm. 



As the specimens of this species are better developed than the prece- 

 ding, it seems probable that they are mere local varieties. 



Occurs in Canada, Middle States, Illinois and Wisconsin. 



H. "exaratus, Lee. Bost. Journ. V., p. 59, pi. 3, fig. 12. 



Closely allied to perplexus, but difiers as follows : Thorax with the 

 inner stria only. Elytra with striie finer. Surface not punctured. 

 Length .14 inch ; 3-5 mm. 



One specimen, Georgia. 



