176 NEW SPECIES MELYRIDAE, CHRYSOMELIDAE AND TENEBRIONIDAE 

 CEPHALICUS GROUP. 



Head broad, eyes very prominent and strongly convex anteriorly, forming a 

 straight and posteriorly convergent line with the temporal region ; elytral 

 maculation obscure ; legs and antennae stout 2. cephalicus, n. sp. 



SENILIS GROUP. 



Body densely and uniformly clothed with coarse and dense cinereous hairs 



- 3. senilis Lee. 



Body more sparsely clothed with finer and less cinereous pubescence 1 



1. Tenth antennal joint almost as long as wide; male elongate and parallel; 



antennae distinctly longer than the pronotum 4. uniformis Casey 



. Tenth antennal joint transverse 2 



2. Fifth ventral abdominal segment truncate at apex, male; pronotal disk 



broadly, evenly convex 5. clavicornis Casey 



. Fifth ventral longer, arcuato-truncate at apex, male; pronotal disk 



arcuately declivous antero-laterally 6. coloradensis, n. sp. 



PUNCTATUS GROUP. 



Basal angles of the pronotum distinctly obtuse and angulate; sixth and eighth 



antennal joints distinctly smaller than the contiguous joints 



7. obscurellus Lee. 



Basal angles of pronotum broadly rounded and quite continuously so with the 



sides and base 1 



1. Smaller species and not elongate; antennae subclavate, joints four to eight 



scarcely longer than wide; frons and central area of pronotum sparsely 



and distinctly punctate; fimbriae very short 8. punctatus Motsch. 



. Larger species; antennae not clavate, long and slender, joints distinctly 



elongate ; pronotum more transverse ; fimbriae moderate in length ; 



pubescence longer; elytral pattern discernible 9. dilutus, n. sp. 



ANNULATUS GROUP. 



Elytra with three transverse fasciae, the median widest, tending to diffuse along 



the suture ; head and pronotum noticeably narrower than the elytral base ; 



central area of pronotum very sparsely punctate 10. martini, n. sp. 



Elytra with three almost even transverse dark fasciae ; surface somewhat dull ; 



fourth and fifth antennal joints triangular 1 



1. Legs piceous or black; form stouter and oblong (male), or oblong-ovate 



(female) 11. annulatus Casey 



. Legs rufous; form feebly elongate, oblong-oval 12. rubripes Casey 



DIFFICILIS GROUP. 



Pronotum strongly and closely indentato-punctate in the central area 1 



Pronotum not closely punctate in the central area but with the intervals flat 



and more or less smooth 7 



1. Third antennal joint in the male with a moderately stout chitinous seta 



near the antero-apical angle ; male parallel and elongate, antennae heavy ; 



female elongate ovate, antennae moderately slender 13. maculosus Casey 



. Third antennal joint in the male without a stouter seta 2 



2. Third antennal joint elongately triangular; elytral maculae more or less 



rounded 14. montanus Casey 



. Third antennal joint more or less cylindrical 3 



