DIAPERINI NORTH OF MEXICO TRIPLEHORN 447 



phyllus until a broader study of the Old World components can be 

 undertaken. 



The insect from Atlanta, Ga., described as P. americanus by 

 Motschoulsky, is unrecognizable. It is smaller then either of our 

 two known species and probably represents some other genus, perhaps 

 even another family such as Ciidae, to which members of this genus 

 bear a striking resemblance. A. Zhelokovtsev (UMMZ) reports that 

 all that remains of the type is the pin, the specimen itself having 

 been lost. 



Key to North American Species of Pentaphyllus 



1. Lateral margins of pro no turn not at all expanded; frons of male with two 



distinct median tubercles; northeastern North America . . pallidus LeConte 



Lateral margins of pronotum distinctly' expanded; frontal tubercles absent in 



both sexes; known only from California calif ornicus Horn 



Pentaphyllus pallidus LeConte 



Plate 3 (Figs. 16, 17) 



Pentaphyllus pallidus LeConte, 1866, p. 126. — Horn, 1870, p. 387. — Hamilton, 

 1895, p. 373.— Blatchley, 1910, p. 1265. 



Description. — Oblong oval, strongly convex, pale reddish brown, 

 shining. Head with clypeus well defined, prolonged beyond genae, 

 anterior margin arcuate; genae rounded, slightly raised above antennal 

 insertions; frons evenly convex; male with two short but prominent, 

 sharply pointed, widely separated tubercles on frons between eyes and 

 in line with lateral margins of clypeus; head of female unarmed; eyes 

 very small, widely separated both dorsally and ventrally; surface 

 coarsely and densely punctured. Pronotum 1.5 times as broad as 

 long, widest near middle, lateral margins feebly rounded, slightly con- 

 vergent anteriorly, not at all expanded, finely beaded; apical margin 

 truncate, base nearly straight with lateral portions broadly expanded, 

 thin and overlapping bases of elytra, slightly reflected in front of 

 scutellum ; both basal and apical angles obtuse and broadly rounded ; 

 entire surface coarsely, shallowly, and rather densely punctured. 

 Elytra with lateral margins parallel, abruptly attenuate and declivi- 

 tous behind; sm-face coarsely, shallowly, uniformly, and densely 

 punctured. Scutellum relatively large, broadly triangular, sparsely 

 punctulate. Ventral surface of pronotum concave, smooth ; prosternal 

 process narrow between coxae, grooved medially, slightly deflected 

 behind, apex prolonged caudally, acutely pointed, prominent; meso- 

 sternum flat, not forming V-shaped ridge in front of mesocoxae; 

 remainder of ventral siu-face very coarsely and densely pmictured, 

 concolorous with dorsum; tibiae all slender; hindtarsus with basal 



