80 Mr. G. C. Champion's Revision of the Mexican 



males and three females. The prothorax of the female is 

 widened posteriorly, and in the male the lateral notch is 

 sharply cut ; the eyes, too, in the last-mentioned sex are 

 much enlarged. 



10. Polemius fleximargo, n. sp. (Plate III, fig. 9, ?.) 



$. Elongate, dull, finely pubescent; nigro-fuscous, the sides of 

 the head in front, the base of the mandibles, the prothorax (an 

 elongate-triangular patch on the disc excepted), and the humeri 

 and outer margins of the elytra flavous, the legs fusco-testaceous 

 with the tarsi blackish. Antennae moderately long, subserrate, 

 rather stout, slightly tapering towards the tip. Prothorax trans- 

 verse, arcuate in front ; the sides rounded posteriorly and rapidly, 

 sinuously converging thence to the apex, the abruptly explanate 

 margin becoming much narrower anteriorly. Elytra long, not 

 wider than the prothorax at the base, distinctly costulate on the 

 disc and arcuato-explanate at the sides just below the humeri, the 

 dilated margin rapidly narrowed thence to the apex, the basal 

 portion of the epipleura broad and somewhat thickened. 



Length (excl. head) 7-8|, breadth 2^3 mm. 



Hab. Panama, Volcan de Chiriqui (Champion). 



Two females, left unnamed by Gorham. This species 

 has the prothorax shaped as in the corresponding sex of P. 

 (Discodon) flaccidus, Gorh., differing from it in the sinuato- 

 explanate elytral margin and the anteriorly widened 

 epipleura. P . fleximargo can be placed near P. photinoides 

 and P. flaccidus for the present, these latter having one of 

 the claws of each tarsus simply lobed at the base in the 

 male, 



11. Polemius tristiculus, n. sp. 



Discodon triste, var., Gorh., Biol. Centr.-Am., Coleopt. iii, 

 2, p. 82. 



Narrow, black, the mandibles testaceous, the sides of the pro- 

 thorax (leaving a large cruciform black patch on the disc) yellow 

 or reddish-yellow; clothed with rather long blackish pubescence. 

 Antennae comparatively short and stout, serrate, slightly tapering 

 towards the tip. Prothorax transverse, in (J subquadrate and with 

 a narrow transverse notch on each side at about one-fourth from the 

 base, in $ with the sides more rounded and deeply sinuate behind the 

 middle. Elytra a little wider than the prothorax at the base, 



