no MEMOIRS ON THE COLEOPTERA 



apparent, though not exactly upon the lines serving as bases for 

 group division assumed by those authors. The genera, as based 

 upon material in my collection, all have lO-jointed antennae and 

 may be separated as follows: 



Mandibles slender 2 



Mandibles broad, rounded externally, concealed almost entirely under 

 the clypeus; body elongate, subcylindric or oval, generally black, 

 the clypeus short, trapezoidal, sinuate or sinuato-truncate at apex; 



pygidium of the same general form as in Cydocephala 18 



2 Pygidium moderate in size; anterior tibiae tridentate 3 



Pygidium very large and convex; anterior tibiae bidentate, the teeth long 



and slender; middle coxae subcontiguous 17 



3 Intermesocoxal surface rather broad, polished and evidently convex 

 though not prominent; pronotum with a thick and strong entire 

 basal bead; elytra coarsely and deeply, confusedly punctate, without 

 striation of any kind; color pale, with black spots and transversely 

 sinuous elytral maculation; pygidium dull, finely and extremely 

 densely granulato-rugulose; clypeus rather short, broadly, evenly 

 parabolic, strongly and closely sculptured, the suture distinct and 

 entire; mentum hairy, the ligula small, subquadrate [Type A. 



nitidula Burm.] Brazil *Augoderia Burm. 



Intermesocoxal surface flat, generally narrow; pronotum not or only 

 partially or very minutely beaded at base, the bead strong and 

 entire in one group of Stigmalia; pygidium never densely dull; elytra 



always with partially striate sculpture 4 



4 Head larger, never less than half as wide as the prothorax 5 



Head small, nearly always less than half as wide as the prothorax. . . .7 

 5 Posterior tarsi with the basal joint slightly produced externally at 

 apex; body oblong, testaceous in color, not maculate, finely sculp- 

 tured; clypeus large, transversely quadrate, with rounded angles and 

 transverse, feebly reflexed margin; legs slender. [Type A, singularis 



Bates] Central America *Aspidolea Bates 



Posterior tarsi with the basal joint slender, sometimes a little shorter 

 than the second and stouter, especially in the female, but never very 

 markedly produced externally; body large to moderate in size. .6 

 6 Head very large, two-thirds as wide as the prothorax; clypeus large, 

 flat, subquadrate, with broadly rounded angles and arcuate, feebly 

 reflexed apex; body stout, subcylindric, the type deep black and 

 shining throughout, strongly sculptured, the elytra with coarsely 

 punctured sulci. [Type Cydocephala carbonaria Arrow] Isthmus 



of Panama *Mononidia n. gen. 



Head moderately large, one-half to three-fifths as wide as the prothorax, 

 the clypeus large, flat, nearly as in the preceding but with the apex 

 feebly or moderately sinuate medially and the edge scarcely at all 

 reflexed; pronotum unmargined or strongly margined at base; 

 elytra generally with fine, moderately punctate striae or in great part 

 with confused sparse punctulation; body elongate-oval, similarly 

 very convex, pallid in coloration, with or without black spots; 



