MALACODERMATA. 237 
Hab. Guatemaua, Cubilguitz (Champion); Panama, Bugaba (Champion). 
Allied to C. debdile, and differing from it chiefly in having the yellow shoulder-stripe 
of a richer rusty yellow and more distinctly defined, the black portions of the elytra more 
intense, and the two apical joints of the antenne yellow. ‘The femora at their bases, 
and the trochanters, are yellow. 
This insect almost exactly simulates Plateros bugabensis in size and pattern; it may, 
however, be superficially known by its brighter colour. 
PLATEROS (p. 19). 
Since my description of the species of this genus in the first part of this volume, a 
very large number of specimens belonging to it have been collected by Mr. Champion. 
I have also extended my acquaintance with the genus, which I now regard as the 
existing representative of the prototype of the family. Dr. Leconte has given a 
summary of the species, he regards as referable to it, found in the United States of 
North America (Trans. Amer. Ent. Soc. ix. March 1881). According to my own view, 
humeralis, Fabr., and érilineatus, Melsh., retained by him in the genus Eros, Newm., 
should be referred to Plateros. Dr. Leconte recognizes the difficulty of defining the 
species, which, he very aptly remarks, are plastic. The remark, however, might well be 
extended to other genera, as, for instance, to Calopteron. The difficulties, however, are 
not greater or less than we meet with in English Coleoptera, for instance among the 
Carabide. 
The males in this genus seem rarer than the females; I have now been able to study 
the males of many of the species from specimens collected by Mr. Champion on the Volcan 
de Chiriqui. The apical segments of the abdomen are formed as usual in this family; 
the seventh is cut out in a small rounded emargination, while the eighth is elongate 
and embraced by the dorsal pygidial plate, which is visible on the ventral side, on each 
side of the apical. ‘The antennee differ scarcely at all from those of the female; they 
are perhaps a little longer and a little more acutely serrate. The head is more pro- 
minent, and the eyes sometimes larger. The prothorax is narrower, and with more 
acutely produced hind angles. ‘The colour is generally very constant; the species are 
differentiated by the greater or less expansion of the elytra, the size and degree of 
serration of the antenne, &c. I have not found it necessary to alter my views upon the 
species, but it will be as well to give some further characters in a tabular form for 
the separation of the most difficult species. 
1 (a). Plateros hogeanus. 
Niger; prothoracis lateribus elytrisque ochraceis, his sutura (apice pretermisso) nigrescente. Long. 12 millim. 
Q. 
Hab. Mexico, Cordova (Hége). 
