Platyxix.e 23 



Colpodes is an East Indian insect, which is generically different 

 from any of the Mexican forms hitherto assigned to Colpodes. 

 There can be little or no doubt that the species of the guerrerensis 

 type, whatever this may prove to be if previously described, form 

 a mere section of Anchomemis as heretofore defined. In fact in 

 Anchomenus reflexus Lee, there is a decided inequality of the pro- 

 jections of the fourth tarsal joint, but it is wholly impossible to 

 separate this species in even a subgeneric sense from cinclicollis 

 Say, and other allied species. Chaudoir noticed this asymmetry of 

 the fourth joint in reflexus, which he quoted under the original 

 preoccupied name marginalus, and assigned it definitely to the 

 Mexican so-called Colpodes, but I am sure for very inadequate 

 reasons. 



Group I {districtus) 

 Subgenus Platynella nov. 



The rather numerous species of this group belong to a section 

 forming part of the very composite Colpodes as understood by 

 Chaudoir. They appear to be apterous, have an unusually large 

 head, rather thick compressed antennae, sharply triangular mentum 

 tooth and rather slender palpi, with the last two joints subequal as 

 a rule. The prothorax is as long as wide or longer, the sides rather 

 strongly reflexed and sinuate basally to the usually sharp angles, 

 the fovese moderate and nearly always smooth, there being no 

 pronotal punctures. The elongate-oval elytra have rather fine 

 impunctate striae, feebly sinuate apices and generally rounded 

 sutural angles, and there is a sharp angle between the sinuate basal 

 line and lateral margin. The species Colpodes marginicolUs of 

 Chaudoir, seems to be one of this series, but is not accurately identi- 

 fiable among so many allied species; all of those at hand seem to be 

 represented by the female alone, and the two examples of margini- 

 colUs known to Chaudoir were also females. The five species at 

 hand, belonging to the fauna of southern Mexico, may be described 

 as follows: 



Tempora swollen in a peculiar manner and almost as prominent as the 

 eyes. Body slender, rather convex; under surface and legs blackish- 

 piceous; prosternum and coxae paler; head and pronotum shining, 

 blackish-piceous, the elytra blacker and opaculate; head large, 

 five-sixths as wide as the prothorax, with broad neck, the eyes very 



