PTENIDIUM. 151 
tibus; pronoto modico, quam caput parum longiore et latiore, glabro, nitidissimo, punctis minutis remotis 
in disco, foveis quatuor magnis equidistantibus ad basin atque duabus minoribus ad marginem anteriorem 
notato, lateribus marginatis et rotundatis, margine basali recta angulis obtusis; scutello magno, foveis 
quatuor magnis ad basin, duabus minoribus ad medium atque una ad apicem notato; elytris sat brevibus, 
quam caput atque pronotum parum longioribus et latioribus, ante medio latioribus, perglabris, nitidissimis, 
stria suturali punctorum remotorum utrinque notatis; pedibus atque antennis late flavis. Long. corp. 
+ lin.=0-63-0-75 millim. 
Head large and broad, very smooth and shining, with three large punctures placed in an oblique line near the 
eye on each side; eyes large and prominent; antennz long, robust, bright yellow. Thorax moderate, 
rather longer and wider than the head, very convex, smooth and shining, with four deep equidistant foves 
at the base and two smaller fovese near the middle of the anterior margin; sides rounded and margined ; 
basal margin nearly straight, with the angles obtuse. Scutellum large, triangular, with four deep punctures 
at the base, two smaller punctures near the middle, and one near the apex. Llytra short, scarcely longer or 
wider than the head and thorax, very convex and shining, with a single puncture on each side near the 
scutellum, and a stria of remote punctures on each side of the suture, the sides rounded and margined, 
widest before the middle, the apex rather attenuated. Legs rather long, very bright yellow, with the tibie 
rather dilated towards the apex. Underparts black, with the mouth and coxe bright yellow and the 
abdomen piceous. 
Hab. Mexico, Cordova (Sallé); GuatemMaLa, Aceytuno (Champion 1). 
This species is distinguished by its short ovate form, and by the peculiar sculpture of 
the scutellum. 
4, Ptenidium ignobile. 
Ptenidium ignobile, Matth. Trans. Am. Ent. Soe. xi. p. 149°. 
Ovale, sat elongatum, piceo-nigrum, glabrum, nitidissimum ; capite magno, in fronte sat producto; oculis magnis, 
prominentibus ; pronoto modico, quam caput parum latiore vix longiore, glabro, nitidissimo, foveis quatuor 
magnis profundis ad basin notato, lateribus modice rotundatis et marginatis, ad media latioribus, margine 
basali recta angulis obtusis; elytris ovalibus, quam caput atque pronotum longioribus haud latioribus, 
impunctatis, nitidis, ante media latioribus, ad apicem attenuatis, apice dilutiore; pedibus atque antennis 
sat longis, late flavis. Long. corp. ;®; lin.=0°63 millim. 
Head large, rather produced in front, shining, and impunctate; eyes very large and prominent; antenne long, 
bright yellow. Thorax moderate, somewhat quadrate, wider but not longer than the head, smooth and 
shining, with four large and very deep equidistant foves: near the base, the sides a little rounded and 
slightly margined, widest near the middle, the basal margin straight, with the angles obtuse. Scutellum 
large, triangular, with four small fovez at the base. Llytra oval, rather narrow, longer but not wider 
than the head and thorax, shining, impunctate, widest before the middle, attenuated towards the apex, 
the apex paler. Legs rather long, bright yellow. Underparts piceous, with the mouth, cox, and the 
apex of the abdomen yellow. 
Hab. Guatema.a, near the city (Champion '), 
Differs from its congeners in its small size, narrow form, four large and deep thoracic 
foveze, and shining impunctate surface. 
5. Ptenidium nitens. 
Ptenidium nitens, Matth. Trans. Am. Ent. Soc. xi. p. 149°. 
Ovale, elongatum, valde convexum, nitidissimum, glabrum, aterrimum; capite magno, prominente ; oculis magnis, 
prominulis; pronoto modico, quam caput latiore et parum longiore, valde convexo, nitidissimo, punctis 
exiguis indistinctis remotis notato, foveis basalibus nullis, ad basin latissimo, lateribus modice rotundatis, 
