1873.] —dJ [Horn. 



Inner thoracic stria entire, outer very short, forming merely an arc at 

 the anterior angle. Elytra with three entire dorsal stria;, fourth exist- 

 ing merely as a trace at apex, sutural very short, subhumeral entirely 

 absent. Propygidium coarsely and very sparsely punctured, pygidium 

 more finely punctured and nearly smooth at apex. Anterior tibia; very 

 finely denticulate, often almost entirely mutic. Length .10 inch ; 4 mm. 



By the entire absence of subhumeral stria, as well as by the nearly 

 mutic anterior tibia; this species is abundantly distinguished from any in 

 the group. 



Occurs from the Middle States to Illinois. 



Group Depurator. 



In this group the anterior tibise are denticulate, the teeth being formed 

 by processes of the tibia; itself, and not as in the preceding group merely 

 spinules attached, so to speak, to the outer edge of the tibia. 



The species are as follows : 

 Thorax unistriate ; elytra tristriate. 



Epipleune unistriate ; anterior tibia; 4-dentate semisculptus. 



Epipleurse bistriate ; anterior tibia? 3-dentate dispar. 



Thorax bistriate. 

 Elytra tristriate. 



Apex of prosternal lobe truncate, on each side slightly 



prominent furtivus. 



Apex of prosternal lobe rounded, normal. 



Epipleurse tristriate, fourth dorsal basal rudimen- 

 tary ; no subhumeral incertus. 



Epipleurse bistriate, fourth dorsal wanting or apical. 

 Apical subhumeral moderately impressed, elytra 



black depurator. 



Subhumeral entirely wanting, elytra bicolored. . . . militaris. 



Elytra with four entire stria;. 



Outer thoracic stria abbreviated, usually very short. 



A short humeral appendix ; form oblong cuitatus. 



No subhumeral whatever ; form broadly oval defectum. 



Outer thoracic stria entire. 



Pygidium smooth, very minutely punctulate indistinctus . 



Pygidium very coarsely punctured servus. 



H. semisculptus, Lee. Xew Species, 18G3, p. 60. 



Inner stria of thorax alone entire, external entirely absent. Elytr;i 

 with three entire striae, fourth and fifth very short, sutural one-fourth 

 the length of the elytra, subhumeral entirely absent at apex, a faintly 

 impressed subhumeral appendix alone existing. Pygidium and propygi- 

 dium coarsely and equally punctured. Epipleune unistriate. Anterior 

 tibia; with outer margin arcuate, -4-deutate, apical tooth bifid. Length 

 .20 inch ; 5 mrn. 



A. p. s. — vol. xiii. 2k 



