139 



yellow radii each side, and the anterior and posterior margins yellow. Elytra 

 pale-green, with about six large brown Spots on each, which are paler in the 

 center than near the circumference. Wings pellucid, with a pale greenish- 

 yellow tinge on the basal portion. Hind tibiaj carneous. 



Dimensions. — ,? Length, 1.1 inches; elytra, 1.1 inches; hind femora, 0.76 

 inch ; hind tibiae, 0.75 inch. 



Upper Arkansas (Say) ; Colorado, Wyoming (Thomas). 



STAUROIVOTIIS, Fisch. 



Body smaller medium size. Head large, globose; face high, slightly 

 deflexed ; vertex very obtuse ; lateral foveolse broad and short, almost contig- 

 uous in front, usually quadrilateral ; from these, on each side between the 

 eyes, little, short carinte run backward. The frontal costa is obliterated near 

 the clypeus ; the lateral carinte distinct ; the cheek carinas abbreviated above. 

 Eyes oblong, somewhat globose. Antennae sub-cylindrical or sub-compressed. 

 Pronotum sub-truncate in front; posterior angle obtuse or sub-acute; distinctly 

 constricted before the middle ; median carina distinct, entire ; lateral carinae 

 only distinct posteriorly (the humeral angles tumid), sub-converging near the 

 middle ; on the anterior portion there is often a pale cross in the form of an 

 X; the transverse sulcus in front of the middle. The prosternum sub-tumid 

 in the middle. Elytra and wings full-sized. Legs pilose, of the usual form. 

 Abdomen sub-carinate above. 



HippoiJedon, Sauss., approaches rather too near this genus to l)c distin- 

 guished as a sepai'ate group. 



St. elllotti, Thos., Proc. Acad. Nat. Sci. Phil., 1870, p. 82, and Hayden's 

 Geol. Surv. Terr, 1870, p. 277. 



Male and female. — Head large, widest below ; face sul5-vertical ; vertex 

 slightly deflexed ; foveolae shallow, the central one broad, the lateral sub-tri- 

 angular, the points of the three meeting in a sharp angle midway between the 

 upper angle of the eye and the base of the antennae; frontal costa not sulcate, 

 narrowed above ; lateral carinas distinct, strongly divergent. Eyes medium 

 size, ovate. Pronotum short, sub-truncate in front; posterior angle obtuse and 

 rounded ; the three transverse incisions distinct and closely approximate, first 

 shortest, second and third connected at their termini on the sides by an oblique 

 impression ; the inedian carina distinct, not elevated ; lateral carinae distinct 

 on the posterior lobe, and sub-distinct on the front of tlie anterior lol)e ; the 



