Platynin.e 43 



with numerous transverse feeble rugulse, the anterior impression 

 deep, the posterior feeble; median stria fine but very broadly im- 

 pressed; foveae short, barely at all impressed; elytra one-half longer 

 than wide, three-fourths wider than the prothorax, very gradually 

 arcuately ogival in about posterior half, the very oblique sinus 

 extremely shallow; suture obtuse and not at all mucronate at tip; 

 striae coarse, deep, distinctly punctured along the bottom; intervals 

 slightly convex, the dorsal punctures as in the preceding. Length 

 (9) 9.0 mm.; width 3.65 mm. Colorado (Peaceful Valley), — 

 Cockerell pacatus n. sp. 



26 — Prothorax cordiform, the sides strongly sinuate basally and parallel 

 for some distance before the basal angles; body slightly ventricose, 

 moderately convex, shining in both sexes, the legs rufous; head 

 well developed, fully four-fifths as wide as the prothorax, slightly 

 elongate, the eyes only moderate in size and prominence; im- 

 pressions rather deep, slightly oblique; antennae rufous, more than 

 half as long as the body, rather thick, gradually thin basally; palpi 

 pale, the last joint longer than the third; prothorax only just visibly 

 wider than long, the sides strongly, subevenly rounded except 

 basally, abruptly and rather strongly reflexed and slightly paler; 

 anterior impression distinct; foveae shallow and moderate, feebly 

 rugulose, at some distance from the sides, obliquely attenuate 

 anteriorly to about the middle; base evidently narrower than the 

 moderately sinuate apex; elytra very evenly oblong-oval, widest 

 at the middle, two-fifths longer than wide, twice as wide as the 

 prothorax, the oblique apical sinus long and very shallow; striae 

 groove-like, fine, becoming coarser at apex, the intervals perfectly 

 flat; three dorsal punctures small, situated as in the preceding; 

 met-episterna only one-half longer than wide; anterior male tarsi 

 feebly dilated, the fourth joint feebly and symmetrically emarginate. 

 Length (cf 9) 5.8-6.8 mm.; width 2.35-2.8 mm. Mexico (Federal 

 District). [ Colpodes concisiis Bates] *concisus Bates 



Prothorax not so cordiform, the more feebly oblique sides posteriorly 

 broadly and only very feebly sinuate, distinctly larger, the hind 

 body narrower, similar in coloration and lustre throughout but with 

 the reflexed side margins scarcely at all paler; head smaller, only 

 two-thirds as wide as the prothorax, but slightly elongate, the eyes 

 even less developed and less prominent than in the preceding; 

 antennae more filiform, not quite so long though more than half as 

 long as the body; last palpal joint slightly longer and thicker than 

 the third; prothorax larger and broader, nearly a third wider than 

 long, the sides more broadly and equally arcuate; basal angles 

 barely more than right, somewhat sharply defined; base slightly 

 wider than the apex, which is rather deeply sinuate, with distinct 

 angles; transverse impressions both almost obsolete; foveae small, 

 deep, smooth, slightly elongate, at a great distance from the sides; 

 between them and the sides there is an elongate smooth elevation of 

 the surface; margins only moderately reflexed; elytra two-fifths 

 longer than wide, three-fourths wider than the prothorax, wider 

 behind the middle than at base, the sides less arcuate than in 



