Horn.] 11" [Feb. 21, 



a different aspect although in many points the two genera approach 

 through C. moerens. The species have been already tabulated (Leconte, 

 New Species, p. 101), but the curious sexual characters exhibited by the 

 species do not appear to have been sufficiently noticed. 

 Anterior tibia} § with one spur only. 



Tibiae obliquely grooved on its interior face polita. 



Anterior tibiae § with two spurs, the anterior frequently 

 short and slender. 

 Anterior tibiae § stouter than the middle tibise and at 

 least moderately arcuate. 

 Hind tibia; § dilated toward apex and strongly com- 

 pressed unguicularis. 



Hind tibiae normal, not flattened Sayi. 



Anterior tibia; § not stouter than the middle and not 

 arcuate. 



Hind tibial spurs short and broad texana. 



Hind tibial spurs unequal, inner slender, outer 



broad aenea. 



P. polita, Say, Journ. Acad. 1823, p. 302 ; Lee. Proc. Acad. 1853, p. 

 336 ; femoralis, Lee. loc. cit. 



JEneous moderately shining. Tibiae, tarsi and tips of femora bluish, 

 femur red. Elytra more darkly aeneous than the head and thorax, 

 sparsely punctured and minutely alutaceous. Length .70 inch ; 18 mm. 

 Mule. Anterior tibia} with one terminal spur, anterior face shining, 

 broadly grooved especially at apex. First joint of anterior tarsus slightly 

 obliquely dilated. Inner spur of hind tibiae slender, acute, outer spur 

 twice as broad as the inner, translucent at tip and obtuse. Last abdomi- 

 nal segment deeply triangularly notched and elevated along its middle. 



Female. Anterior tibiae bicalcarate, not obliquely grooved. Last ab- 

 dominal segment sub-truncate at tip. 



In one female before me the tibia} are entirely pale and this may result 

 from immaturity. 

 The specimens before me are from Georgia and South Carolina. 



P. unguicularis, Lee. New Species, p. 100. 



iEneous, surface glaucous. Legs pale yellowish red, knees slightly 

 tipped with brown. Length .70-.80 inch ; 18-20 mm. 



Male. Anterior tibia} moderately broad, stouter than the middle tibiae 

 and more arcuate, inner face broadly grooved from base to apex, at tip 

 bicalcarate. First joint of anterior tarsus compressed. Hind tibiae 

 moderately broad, rather strongly compressed and acute on the inner 

 edge, inner spur slender, outer broad, but not obtuse at tip. Last ab- 

 dominal segment very deeply incised and deeply concave, penultimate 

 segment broadly emarginate and in front of margin slightly thickened. 



Female. Terminal segment of abdomen feebly emarginate and slightly 

 impressed at tip. Anterior tibise straight. 



One pair, Illinois. 



