CALIFOIJMA ACADEMY OF SCIENCES. oU 



IV. 

 THYCE Ler. 



Tiic following speeitis was rocoutly announced by nio 

 imdoi' the gcnoric name Polyplijlla (Bull. Cal. Acad. Sci., 

 I, p. 285). Tlic genus Tliyce, altliougli resembling Poly- 

 pliylla very greatly, dillers radically in antenna) structure, 

 the club being trifoliate and the joints of the funich; of 

 nearly equal length; wJiile in Polyphylla the greatly devel- 

 oped third joint is a very prominent distinctive feature, in 

 addition to the more com])lex club. 



In T. iiwrgincla the anterior tibiae liave two teeth (Exclu- 

 sive of the exterior apical spur which is very pronounced; 

 these teeth are very unecpial, the one nearer the base Ixnng 

 very short and obtuse. The males have a large and r;ither 

 feeble impression in the middle of the abdomen near the 

 base. I have not seen the female. 



T, margiliata "• sp. — Form modi-rately robust; siilcs distinctly .'irciiate; 

 prothorax piccons; elytra rufo-fnscons: the former having' three posteriori}' 

 divergout lines of whitish sfpianiose pubescence, the exterior ones widest and 

 iuternipt'.d in tlie middle, the median very fine and almost obsolete toward 

 base; each elytron having along the exterioredge a very wide lino of plumbeo- 

 cinereons and very slender srpiamose pubescence, not very densely placed, 

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

 row, whit r an I much Ijetter defin-d line to the base; lietween these there is 

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

 escen(te elsewhere tine and very s[)arse; legs and antenn;o fuscous; each \cn- 

 tral segment having an irregular spot of whitish squamiform pubescence at 

 each side next the elytra. ILtid excluding the eyes slightly long>'r than 

 w.de, sub-(piadrate; clyi)eus moderately ri'tlexed, broadly and feeldy sinuate 

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

 sparse, mixed with sciuaniose hairs near the bas(^ and sides; antennai well 

 developed, funich' 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 nuddle of 

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

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

 and straight to the liasal angh'S which are obtust^ and slightly rounded; base 

 broadly angulate, feebly siiuiate toward ea<;li basal angle; disk stmngly con- 

 vex, rather linelj', moderately densely Hn<l irregularly punc ate; punctures 

 round, very shallow, variolate. El i/tra at base slightly wider than the pro- 

 thorax; sides parallel and feebly arcuate; together slightly less than one-balf 



