Sept-Dec, 19 18.1 SCHAEFFER : COLEOPTEROLOGICAL NoTES. 213 



the sides of clypeus not rounded l)ut truncate, the eyes above rela- 

 tively more closely placed, the prothorax with rounded lateral margin 

 and anterior ang'les not truncate and the elytral ai)ex always of the 

 same bright green color as the other fasciae 



I am uncertain of the sex but whether male or female the apex of 

 last ventral segment is different from those of C. clirysa:la. > 



Mastogenius puncticollis new species. 



Black, bronzed, glabrous. Head convex with a more or less distinct median 

 impression ; moderately coarsely and not closely punctate ; antennae extending 

 about a little below the hind angles, serrate from the fourth joint, second joint 

 short, globose, third elongate about as long but much narrower than second, 

 shorter than the fifth and scarcely half as long as the fourth. Prothorax a 

 little wider than long, widest a little behind middle ; feebly converging towards 

 base, more rapidly towards apex ; surface rather coarsely and moderately 

 closely punctate, intervals between the large punctures densely punctate with 

 much finer punctures : at middle a more or less distinct, elongated, narrow, 

 feebly elevated line. Elytra as wide at base as the basal margin of prothorax; 

 sides subparallel : surface glabrous, rather less coarsely punctate than the pro- 

 thorax, and with the punctures a little more widely separated. Presternum 

 and metasternum rather coarsely punctate: ventral segments more finely punc- 

 tate, the punctures more widely separated. Posterior margin of hind coxal 

 plate broadly sinuate. Length 3 mm. 



Huachuca Mountains, Arizona. 



DiiTers from all our species in the shape and punctuation of 

 prothorax. 



Trigonogya new genus. 



Head convex, very feebly impressed ; antennae dentate from the 

 fourth joint. Eyes oval, nearly parallel. Prothorax truncate at base. 

 Scutellum small, subtriangular. Elytra convex, truncate and deeply 

 impressed at base. Prosternum truncate in front, laterallv with dis- 

 tinctly limited antennal cavities and w^ith a fine carina on each side 

 of middle. Mesosternum invisible. Metasternum truncate in front. 

 Posterior cox<e nearly contiguous; coxal plates feebly dilated inter- 

 nally and externally. 



Type — Mastogenius rcticitlaticollis Schaef. 



This new genus differs from Mastogenius and, judging from the 

 descriptions, from all the known genera of the tribe Mastogenini by 

 the distinct antennal cavities of the prosternum and seemingly also 

 by the carinate prosternum. 



