CETONIIN.E 371 



Hind coxae very remotely separated; basal joint of the hind tarsi relatively 

 very much elongated 7 



2 External maxillary lobe corneous, transversely trigonal; body large 

 in size; scutellum elongate, triangular and apically attenuate. 



Osmoderma 



External maxillary lobe coriaceous and lamelliform; scutellum smaller, 

 ogival or rounded; body of small or moderate size 3 



3 Elytra longer than wide, glabrous; anterior tibiae bidentate in both 

 sexes 4 



Elytra short, never distinctly longer than wide 5 



4 Antennae lo-jointed as usual; mentum very large, with a broad deep 

 apical sinus; hind tarsi much longer than the tibiae; upper surface 

 glabrous throughout, the elytra shining and often metallic. Europe. 

 [Type Scarab, variabilis Linn.] *Gnorimus 



Antennae lo-jointed, the mentum and tarsi as in Gnorimus; head and 

 pronotum pubescent as in Trichins; elytra flatter, opaque, pale, with 

 black spots. [Type Cetonia macidosa Knoch] Gnorimella 



Antennae 9-jointed; mentum narrower, similarly flat but with a small 

 deep anterior sinus; hind tarsi subequal in length to the tibiae, very 

 much shorter than in either of the preceding genera; body small, the 

 pronotum shining, with an impressed figure romewhat as in Trigo- 

 nopeltastes; elytra glabrous, opaque, with black and rufous coloration. 

 [Type R. floridana Csy.] Roplisa 



5 Anterior tibiae bidentate (cf), tridentate (9 ); upper surface glabrous 

 and opaque almost throughout, the pronotum generally with a 

 reversed deltoid figure on a dark ground, the elytra pale, with black 

 maculation; hind tarsi very much longer than the tibiae. [Type 

 Scarab, delta Forst.] Trigonopeltastes 



Anterior tibiae bidentate in both sexes; upper surface in great part pu- 

 bescent; hind tarsi similarly very long, not so long and generally 

 more slender in the female 6 



6 Elytra quadrate, parallel, the sides barely swollen basally, the side 

 margins reflexed, not thickened, the surface generally opaque, with 

 black fasciae, without cretaceous spots. Europe. [Type Scarab, 

 fasciatns Linn.] *Trichius 



Elytra more cuneiform, generally distinctly swollen at the sides basally, 

 the lateral edges not reflexed but thickened, the surface shining and 

 with transverse cretaceous spots at the sides, wanting in a few species. 

 [Type Trichins piger Fabr.] Trichiotinus 



7 Body small to very small in size, oblong, flat above, more or less 

 squamose, the anterior tibiae slender, linear, 5-dentate externally, 

 the middle tooth the longest; apex of the pygidium ( 9 ) in some 

 species prolonged obliquely in a long slender spiniform process. 

 [Type Scarab, hemiptents Linn.] Valgus 



The European genera Gnorimus Serv., and Trichius Fabr., are 

 only introduced for comparison, as our American species so named 

 are not congeneric. Valgus constitutes in reality a distinct tribal 

 group, as properly recognized in the European catalogue of Heyden, 



