DYNASTIISME 1 1 1 



middle coxae narrowly separated, the intervening surface concealed 

 by tawny hairs. [Type Cyclocephala mafa/a Burm.] Mexico and 

 Central America *Stigmalia n. gen. 



7 Ligula deeply impressed, the apex more or less acutely bilobate; 

 mentum not impressed at base 8 



Ligula not deeply impressed, nor with the apex strongly bilobed; mentum 

 not impressed at base 10 



Ligula very small, truncate, slightly convex; mentum convex, bristling 

 with coarse hairs, having basally a large and very deep angulate 

 concavity; mandibles and labrum very small, concealed; body oblong, 

 convex, the type deep black, shining and with strongly sulcate elytra, 

 somewhat as in Mononidia; clypeus trapezoidal, concave and much 

 reflexed apically, the apex deeply and rather narrowly sinuate and 

 prominently bilobed, the suture obsolete; front tumid centrally; pro- 

 notum with a thick entire basal bead; middle coxae barely at all 

 separated; legs slender, the filiform tarsi very much longer than the 

 tibiae, the claws unusually large and long. [Type A. cribrifrons 

 Schf.] Sonoran regions Anoplocephalus Schf. 



8 Middle coxae contiguous or virtually so, the very narrow intermediate 

 surface concealed by dense bristling hair; body of rather large size, 

 varied in coloration from entirely pale to wholly black, generally 

 with feeble elytral sculpture; pronotum unmargined at base, though 

 often with an evident bead near the sides; clypeus more or lesf acutely 

 ogival in form; abdomen normal. [Type Cyclocephala scarabceoides 

 Burm.] Neotropics and northward to Arizona. 



Ancognatha Erichs. 



Middle coxae rather widely separated, the intermediate surface flat and 

 glabrous; posterior pronotal edge finely double 9 



9 Body oblong-oval, convex, pallid, with few small dark elytral spots; 

 head about half as wide as the prothorax, the clypeus nearly as long 

 as wide, narrowly parabolic, gradually and rather strongly reflexed 

 apically, the periphery very finely and equally beaded throughout; 

 mentum more convex than in the preceding; ligula deeply impressed 

 at apex, the lobes limiting the deep sinus acute as in Ancognatha. 

 [Type Cyclocephala maculata Burm.] Cayenne and the Amazon 

 regions *Mimeoma n. gen. 



Body more elongate-oval, the habitus more as in Cyclocephala signata, 

 the elytra pallid, with a few black dashes; clypeus flat, feebly trape- 

 zoidal, with rounded sides and broadly rounded angles, the apex but 

 feebly reflexed and deeply sinuate medially; mentum quadrate, 

 rather convex, the abruptly moderately narrow ligula not deeply 

 concave, broadly sinuate at apex between the bluntly dentiform 

 prominences, the legs notably slender as in the preceding genus. 

 [Type Cyclocephala discicollis Arrow] Isthmus of Panama. 



*Diapatalia n. gen. 



10 Abdomen generally normal and with the segments subequal in length 

 in both sexes, sometimes with the fifth segment (cf ) a little longer 

 than the others; body moderate to rather small in size 1 1 



Abdomen (cf ) with the first four segments very short, together not as 

 long as the last two combined, or ( 9 ) normal and with subequal 



