CALIFORNIA ACADEMY OF SCIENCES. 39 



IV. 

 THYCE Lee. 



The following species was recently announced by me 

 under the generic name Polyphylla (Bull. Cal. Acad. Sci., 

 I, p. 285). The genus Thyce, although resembling Poly- 

 phylla very greatly, differs radically in antennal structure, 

 the club being trifoliate and the joints of tlie funicle of 

 nearly equal length; while in Polyphylla the greatly devel- 

 oped third joint is a very prominent distinctive feature, in 

 addition to the more complex club. 



In T. marginata the anterior tibiae have two teeth exclu- 

 sive of the exterior apical spur which is very pronounced; 

 these teeth are very unequal, the one nearer the base being 

 very short and obtuse. The males have a large and rather 

 feeble impression in the middle of the abdomen near the 

 base. I have not seen the female. 



T. marginata n. sp. — Form moderately robust; sides distinctly arcnate; 

 prothorax piceous; elytra rufo-fnscous: the former having three posteriorly 

 divergent lines of whitish sqnamose pubescence, the exterior ones widest and 

 interrupted in the middle, the median very fine and almost obsolete toward 

 base; each elytron having along the exterior edge a very wide line of plumbeo- 

 cinereous and very slender squamose pubescence, not very densely placed, 

 which is recurved at the apex continuing thence along the suture as a nar- 

 row, whiter and much better defined line to the base; between these there is 

 another very fine line terminating at one-fifth the length from the apex; pub- 

 escence elsewhere fine and very sparse; legs and antennae fuscous; each ven- 

 tral segment having au irregular spot of whitish squamiform pubescence at 

 each side next the elytra. Head excluding the eyes slightly longer than 

 wide, sub-quadrate; clypeus moderately reflexed, broadly and feeblj^ sinuate 

 anteriorly; angles right and not at all rounded; pubescence long, rather 

 sparse, mixed wuth squamose hairs near the base and sides; antennte well 

 developed, funicle two-thirds as long as the club and nearly as long as the 

 head, club viewed upon the broad side slightly' wider at apex than at base, 

 three and one-half times as long as wide, Prothorax widest at the middle of 

 its median length where it is four-fifths wider than long; sides thence 

 strongly convergent and feebly arcuate to the apical angles, feebly convergent 

 and straight to the basal angles which are obtuse and slightly rounded; base 

 broadly angulate, feebly sinuate toward each basal angle; disk strongly con- 

 vex, rather fiuely, moderately densely and irregularly punc'ate; punctures 

 round, very shallow, variolate. Elytra at base slightly wider than the pro- 

 thorax; sides parallel and feebly arcuate; together slightlj' less than one-half 



