298 MEMOIRS ON THE COLEOPTERA 



the conformation of that part being similar in certain species to 

 that characterizing several old world genera. In studying our 

 species, however, it becomes easy to define a number of separate 

 genera based upon the clypeus, sternal process and tarsi, but to 

 differentiate these genera from the old world genera in every case 

 may be a difficulty not quite so readily overcome. Of this it is 

 impossible for me to say more at the present time, owing to the lack 

 of sufficient foreign material. The North and South American 

 genera can be defined in few terms as follows: 



Mesosternal process forming a smooth and generally glabrous knob 

 between the coxae 2 



Mesosternal process always densely pubescent, its anterior end diversified 

 in form 4 



2 Pronotum having an entire marginal bead at the sides; clypeus varying 

 in form from obtusely acuminate to broadly obtuse, sometimes bi- 

 lobed, at tip; pronotum sinuate to truncate medially at base; hind 

 tarsi variable in length but generally short, sometimes strongly com- 

 pressed. (Erirhipis Burm.) [Type Cetonia sepulchralis Fabr.] 



Euphoria 



Pronotum not margined at the sides, sinuate medially at base; tarsi 

 extremely short 3 



3 Clypeus having the usual form in Euphoria, broad and obtuse at apex; 

 body very pubescent; hind tibiae (c? 1 ) with an internal brush of long 

 dense hairs, the pygidium of that sex with two nodal points instead 

 of the usual one. [Type Euphoria hirtipes Horn]. . Euphoriaspis 



Clypeus broadly sinuato-truncate at apex, with an abrupt internally 

 sharp dentiform process at each side; tibiae in both sexes with the 

 usual internal loose fringe of setae; hind tarsi very short, compact and 

 compressed; elytra devoid of sculpture. [Type Euphoria hera 

 Burm.] *Euphoriopsis 



4 Clypeus broadly sinuate and laterally dentate at apex 5 



Clypeus at apex with four small acutely spiniform teeth, the two median 

 approximate and more advanced than the lateral 6 



5 Body very hairy above and beneath, the elytra rather depressed; 

 pronotum not or imperfectly margined at the sides, the median line 

 conspicuously elevated. [Type Scarabceus hirtellus Linn.] . Tropinota 



Body subglabrous, moderately pubescent beneath, the elytra convex and 

 very differently sculptured; pronotum with a distinct and entire 

 lateral bead, without trace of elvated median line. [Type Euphoria 

 verticalis Horn] Anatropis 



6 Body oblong-oval, convex, usually with abundant pubescence, at 

 least beneath; pronotum without an elevated median line. [Type 

 Cetonia areata Fabr.] Stephanucha 



These genera are very unequal in extent, all but Euphoria being 

 based upon one to three or four species, but, at any rate, this 



