1 6 Memoirs on the Coleoptera 



In both these groups, of which the first is subarctic and the second 

 tropical, the external line of foveoles on each elytron is entire but 

 rather irregularly spaced. 



Group I 



Subgenus Hemiplatynus in sp. 



But one species represents this group so far as known to the 



writer; it may be described as follows: 



Body moderately ventricose, deep black, the legs black, with piceous 

 tarsi; upper surface shining, the elytra opaque; head moderately 

 elongate, two-thirds as wide as the prothorax, the eyes moderate 

 in size and prominence; antennae three-fifths as long as the body, 

 very slender, dark piceo-rufous; prothorax fully as wide as long, 

 widest barely before the middle, the broadly and strongly reflexed 

 sides subevenly rounded, slightly oblique and a little straighter 

 basally; base transversely subarcuate, fully as wide as the sinuate 

 apex, the basal angles very broadly rounded; foveae large, concave, 

 but feebly prolonged anteriorly, the transverse impressions very 

 feeble though traceable, the stria finely impressed, basally abbrevi- 

 ated; elytra oblong-oval, scarcely more than one-half longer than 

 wide, three-fifths wider than the prothorax, the subevenly arcuate 

 sides not broadly but strongly reflexed, becoming feebly sinuate 

 apically, each apex broadly rounded; striae very fine though clearly 

 defined, impunctate, the scutellar short; dorsal punctures moderate, 

 three to four in number, the anterior adhering to the third, the 

 posterior to the second stria. Length (9) ii. 0-12.0 mm.; width 

 4.0-4.5 mm. Mexico (Colonia Garcia, Sierra Madre Mts., Chi- 

 huahua), — Townsend. Four examples. [Platynus chihuahucB Baits]. 



*chihuahuse Bates 



I assume that the specimens at hand correctly represent the 

 Batesian species (Biol. Cent.-Amer., Vol. I, Suppl.), although the 

 word alutaceous in regard to the elytra might better be densely 

 opaque and the strong depression of the elytral surface could 

 hardly be satisfied by "sat convexus." 



Group II 

 Subgenus Stenoplatynus nov. 

 I have likewise been unable to discover more than a single species 

 of this remarkably distinct Platynoid type, and can find nothing 

 resembling it among the writings of Mr. Bates. It may be de- 

 scribed as follows: 



Body much narrower, decidedly more convex, shining, with alutaceous 

 elytra; color rather pale testaceous, the elytra rufo-piceous; head 



