AMERICAN COLEOPTERA. 145 



Male. — Thorax with a moderate horn from the middle of the an- 

 terior margin, and one on each side broad and laminiform obliquely 

 truncate or rounded at tip and crenulate ; a deep fossa on each side 

 as in Antseus. Clypeus broadly emarginate and slightly re- 

 flexed at tip, front bituberculate. Galea of mandibles lamini- 

 form, truncate in front with a slight notch and a slight sinu- 

 ation externally. 



Female.— IhoxsiX with slight tubercle at middle of ante- 

 rior margin with an antemedian, oval, moderately deep fossa. 

 Clypeus oval and truncate at tip Galea of mandibles re- 

 sembling that of the male with, the outer tooth in form of an obtuse 

 lobe. 



In both sexes the thoracic fossae, as well as a narrow space alon"- 

 the basal margin, are transversely wrinkled. The thoracic processes 

 of the male become greatly reduced in many specimens so that the 

 form of the female is approached, but however much the posterior 

 horns are reduced, the anterior is always moderately prominent and 

 more so than in any female. The form of the thorax resembles the 

 preceding species in having the sides very strongly arcuate at middle 

 and rapidly narrowing at apical half. 



This species occurs from Georgia to Mexico. 



S. splendens Beauv. 



General characters. — Form oval, narrower in front, color uniform, 



castaneous. Elytra with distinct sutural stria. Outer angle 



of the tip of hind tibia deeply notched, with very slight trace 



of tooth in the notch and two spinules only. 



Male. — Thorax with a short process from the middle of the anterior 



margin, very broad at base, behind which is a shallow oval impression. 



Clypeus truncate at tip and feebly reflexed, front with feeble tubercles. 



Galea of mandibles with the middle tooth prominent but 



broad and obtuse at tip, inner tooth very short, outer scarcely 



evident. Anterior spur of middle tibia conspicuously stouter 



and broader than in the female. 



Female.— Thorax with feeble trace of tubercle near the 

 anterior margin and a very shallow impression. Clypeus 

 less distinctly truncate at tip. Galea of mandibles with 

 the inner two teeth similar and equal, outer in the form of a slight 

 lobe. 



^ This species is a little less robust than Antxus and narrower ante- 

 riorly. The only difficulty which might arise with the present species 

 is in the separation of its males from the females of the preceding. 



TRANS. AMER. ENT. SOC. (19) SEPTEMBER, 1875. 



