146 GEO. H. HORN, M. D. 



Here reliance must be placed primarily in the form of the galea of 

 the mandible and secondarily in the form of thorax. The bead along 

 the basal margin of the thorax is here very feebly and in Jidianus 

 very well developed. 



This species occurs in Georgia and Florida, and is not common. 



S. IVIorinoii Burm. 



General characters. — Body oval, slightly narrower in front, color 

 castaneous. Sutural stria entire, deep. Hind tibiae as in Avtxiis. 

 Male. — Thorax with a very small tubercle notched at summit, and 

 a vague and very slight impression. Clypeus oval, tip re- 

 flexed and subacute, front not tuberculate. Galea of mandi- 

 liles with the middle tooth prolonged into a slender and 

 acute process, inner tooth obtuse and inconspicuous, outer 

 entirely absent. 



Female. — Thorax similar to the male. Clypeus very acute 

 at tip. Galea of mandibles similarly formed but with the 

 median tooth less prolonged. 



In the prolongation of the middle tooth this species resembles the 

 male of Antaeus, its characters are so evident that it will not be mis- 

 taken for that or any other species. 



Occurs in Kansas and Texas, very rare. 



S. cessu.«» Lee. 



General characters. — Form oblong oval, slightly narrowed in front, 

 color uniformly piceous. Sutural stria entire, elytra with more de- 

 cided evidences of sculpture. Hind tibiae as in Antseas. 



Male. — Thorax with a feeble tubercle near the margin, 

 behind which is a shallow oval impression. Clypeus oval, 

 tip subtruncate and reflexed in an obtuse point. Front with 

 feeble transverse ridge. Galea of mandibles not notched, 

 truncate in front free angle rounded. 



Female — Precisely similar to the male in every respect 



except in the form of the pygidium as already explained. 



This species cannot be confounded with any other. The similarity 



of the males and females is what might be expected to occur. The 



sexes are barely distinguishable in splendens. less so in Mormon, and 



identical here. 



Occurs in Arizona, rare. 



One species of this genus remains as yet unsatisfactorily determined, 

 Scar<ibseus Bosci Beauv., Ins. p. 89, pi. 2b, fig. 1. It is evidently of 

 the size and form of splendens and has a similar horn at the anterior 

 thoracic margin, but the clypeus is described as being very acute, in 



