68 MEMOIRS ON THE COLEOPTERA 



Pronotum without trace of such basal marginal beading; clypeus narrowed 

 anteriorly, bilobed or bidentate at apex. (Group RUTEL.E) 7 



2 Clypeal suture obsolete medially. (Group PELIDNOT.E) 3 



Clypeal suture very distinct throughout the width. (Group AREOD.E) . . 6 



3 Mandibles obtusely bidentate externally; posterior legs nearly similar 

 in the sexes. North and South America Pelidnota 



Mandibles broadly though more or less unevenly rounded externally; 

 ligula extremely short; labrum very diversely modified medially. .4 



4 Posterior legs very greatly enlarged in the male. Mexico. . Chrysina 



Posterior legs nearly similar in the sexes 5 



5 Head large, the reflexed prosternal process prominent. Warmer 

 parts of North and South America Plusiotis 



Head small, the reflexed prosternal process inconspicuous. Sonoran. 



Plusiotina 



6 Clypeus transversely parallelogramic; body glabrous above, pubescent 

 beneath. Nearctic regions east of the Rocky Mountains. . Cotalpa 



Clypeus semicircular, the integuments pubescent above as well as beneath. 

 Pacific regions, eastward to the Rocky Mountains Pocalta 



Clypeus triangular; integuments glabrous above, coarsely and closely 

 sculptured, pubescent beneath. Sonoran regions Parareoda 



7 Tarsal claws entire throughout; intermesocoxal surface broad, flat 

 and anteriorly advanced to a moderate degree; upper surface of the 

 body smooth, or with very minute sparse punctulation. Neotrop- 

 ical regions and Florida Rutela 



Tarsal claws irregular, the male having the larger of the intermediate 

 and posterior tarsi very coarsely and deeply cleft, both claws of the 

 anterior smaller and simple; female with all the claws slender and 

 simple; intermesocoxal surface narrow, not prominent; upper surface 

 of the body coarsely and deeply sculptured. Atlantic nearctic 

 regions Polymoechus 



All of these genera have the scutellum relatively small, in marked 

 contrast to some of the tropical genera, such as Anticheira, where 

 this part is enormously developed and the antennae are lo-jointed 

 throughout, differing also in this way very markedly from the 

 Anomalini. I have included Chrysina above among our genera, 

 for the reason that the National Museum has the mutilated hind 

 body of a large green species, which seems to represent the female 

 of a Chrysina; it was found by Mr. Schwarz in southern Arizona. 

 No further allusion to the genus than this will be made at present. 



Pelidnota MacL. 



In this genus the body is oblong-oval in form, rather convex, 

 variably but always distinctly sculptured and glabrous above, 

 very feebly pubescent on the sterna and with opalescent metallic 

 lustre, or almost wholly devoid of such lustre, usually of pallid 



