289 



[Horn. 



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

 tlie anterior angle. Elytra with three entire dorsal strise, fourth exist- 

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

 absent. Propygidium coarsely and very sparsely punctured, pygidium 

 more finely punctured and nearly smooth at apex. Anterior tibiiB very 

 finely denticulate, often almost entirely mutic. Length .16 inch ; 4 mm. 



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

 mutic anterior tibiaj this species is abundantly distinguished from anj' in 

 the group. 



Occurs from the Middle States to Illinois. 



Group Depurator. 



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

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

 spinules attached, so to speak, to the ou#er edge of the tibia. 



The species are as follows : 

 Thorax unistriate ; elytra tristriate. 



Epipleurai unistriate ; anterior tibiye 4-dentate semisculptus. 



Epipleuraj bistriate ; anterior tibi;« 3-dentate disj^ar. 



Thorax bistriate. 

 Elytra tristriate. 



Apex of prosternal lobe truncate, on each side slightly 



prominent furtivxis. 



Apex of prosternal lobe rounded, normal. 



Epipleurie tristriate, fourth dorsal basal rudimen- 

 tary ; no subhumeral incertus. 



Epipleurse bistriate, fourth dorsal wanting or apical. 

 Apical subhumeral mederately impressed, elytra 



black depurator. 



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



Elytra with four entire striae. 

 Outer thoracic stria abbreviated, usually very short. 



A short humeral appendix ; form oblong curtatus. 



No subhumeral whatever ; form broadly oval defectus. 



Outer thoracic stria entire. 



Pygidium smooth, very minutely punctulate indistinctus. 



Pygidium very coarsely punctured servus. 



H. semisGulptus, Lee. New Species, 18G3, p. CO. 



Inner stria of thorax alone entire, external entirely absent. Elytra 

 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. Epipleurce unistriate. Anterior 

 tibiae with outer margin arcuate, 4-dentate, apical tooth bifid. Length 

 .20 inch ; 5 mm. ' 



A. V. S, — VOL. XIII. 2k 



