56 CASEY 



2 Epipleurae very wide, occupying the entire inflexed sides of the 



elytra ; intercoxal process of the abdomen acute ; antennae slender, 

 dilated moderately toward apex. Habitat insular. [Type Eu- 

 sattus robustus Lee.] ............................................. Nesostes 



Epipleurae narrow, occupying much less than the entire inflexed sides 

 of the elytra, except sometimes at the immediate base .............. 3 



3 Epipleurae abruptly dilated at base to the lateral limits of the 



elytra ; intercoxal process of the abdomen acute ; body oblong or 

 oblong-oval, moderately convex ......... ............................. 4 



Epipleurae gradually becoming wider basally, sometimes extend- 

 ing to the sides of the elytra at base ; sides of the elytra always 

 obtusely rounded in section, never acutely margined ; antennae 

 slender, dilated apically, the joints loose and obtriangular to sub- 

 cy lindric ............. ......................................................... 7 



4 Sides of the elytra acute and reflexed almost to the apex ; elytra 



conspicuously sculptured ..................... , ............................ 5 



Sides obtusely rounded in section as in Eusattus .......................... 6 



5 Antennae less slender, compressed, more glabrous and more com- 



pact, gradually and more feebly enlarged distally, the joints ob- 

 trapezoidal, the subapical transverse, the eleventh narrower than 

 the tenth; tarsi long and slender; femora and propleurae gla- 

 brous. Habitat Sonoran of the Lower Rocky Mountains. [Type 

 Zophosis reticulata Say] ................................... Discodemus 



Antennae slender, the joints obtriangular, gradually wider distally, the 

 last joint as wide as the tenth and longer ; tarsi shorter and stout ; 

 femora and propleurae with bristling hairs. Habitat Lower Cali- 

 fornia. [Type Eusattus erosus Horn] ......... , ....... Megasattus 



6 Elytra without coarse sculpture or punctuation of any kind, sub- 



opaque. Habitat Lower California. [Type Eusattus Iczv is Lee.]. 



Eusattodes 



7 Intercoxal process of the abdomen acute, the coxae throughout nar- 



rowly separated ; body oblong-oval to parallel, moderately convex ; 

 propleurae with or without bristling hairs. Habitat widely ex- 

 tended in the Sonoran and Pacific regions. [Type E. difficilis 



Eusattus 



Intercoxal process obtuse, the coxae more widely separated throughout ; 

 body more broadly rounded, very convex, the sculpture more muri- 

 cate ; propleurae with more conspicuous bristling hairs. Habitat 

 as in Eusattus. [Type Eusattus muricatus Lee.] ...Sphaeriontis 



8 Scutellum well developed, triangular ................................... 9 



Scutellum subobsolete, very minute, triangular ........................... 12 



9 Posterior angles of the prothorax strongly posteriorly produced, 



as in the preceding group of genera ; palpi more elongate than 

 usual ; last three joints of the antennae moderately dilated ; basal 

 joint of the anterior tarsi rather longer than the next two com- 



