RUTELIN/E 103 



Parastasiids (Deut. Ent. Zeit., 1900, p. 225); this puzzling genus 

 is a Cetoniid in almost every way, including a strong habital 

 resemblance in that direction, excepting only that the tarsal 

 claws are thoroughly Rutelid, it forming one of those exceptions 

 rendering a rigorous definition of major groups so difficult in such 

 large and long established families as the Scarabaeidae. 



In PolymcEchus the body is almost exactly as in Ligyrus in general 

 features of form, coloration and sculpture, but the eyes and antennal 

 club of the male are notably more developed, and the peculiar 

 dentition of the anterior tibiae and in part widely cleft tarsal claws, 

 betray its very wide distinction. Its anatomical characters are 

 given by G. H. Horn (Tr. Am. Ent. Soc., 1882, p. 121) and some 

 misstatements of the latter, due to the persistent refusal of that 

 author to employ adequate optical means of amplification, corrected 

 by Ohaus (1. c., p. 258), so that no detailed account is necessary at 

 the present time. The species are few in number and individually 

 rare, or at least seldom taken by collectors; those in my collection 

 may be known as follows : 



Form cylindric-oval, strongly convex, shining, castaneous to black in 

 color throughout, glabrous, the sterna with long, moderately dense 

 yellowish hairs; head slightly (cf ) to very much ( 9 ) less than half as 

 wide as the prothorax, linearly rugulose and punctulate, discretely 

 punctate basally, the eyes (cf) convex, prominent and separated by 

 fully twice their width, or ( 9 ) smaller, less convex and separated 

 by two and one-half times their width; clypeus slightly concave, 

 twice as wide as long, the edges strongly reflexed, the apex sharply 

 bidentate and strongly upturned, the dividing sinus continuing 

 posteriorly on the disk as a slightly impressed line, bounded anteriorly 

 by two acute ridges extending posteriorly from the teeth; sides 

 becoming parallel basally; antennal club (G?) longer than the stem, 

 or ( 9 ) much shorter, though fully as long as the shorter stem in that 

 sex; prothorax evenly and strongly convex, three-fourths wider 

 than long, the sides subevenly rounded, becoming parallel, viewed 

 dorsally, in about basal half; apical sinus very feeble, the angles 

 extremely short and obtuse, the basal obtuse and rather narrowly 

 rounded; base feebly lobed medially, without trace of beading, the 

 apical bead coarse and entire, the lateral fine and reflexed; punctures 

 rather strong, somewhat well separated, closer laterad, becoming 

 minute and remote medio-basally; scutellum well developed, wider 

 than long, almost perfectly smooth, the sparse punctulation ex- 

 tremely minute; elytra not wider than the prothorax, a fifth longer 

 than wide, rapidly and very obtusely rounded at apex, the sides 

 subparallel, feebly arcuate posteriorly; surface with regular and feebly 

 impressed coarse striae of very shallow, annular punctures, the second 



