216 STAPHYLINIDA. 
ventral plate of this segment is evidently dilated behind; and on the second segment 
the edge of the ventral plate forms a prominent tubercle on each side about the middle 
of the length of the segment. 
3. Platonica intermedia. 
Ferruginea, capite elytrisque versus apicem fuscis, pedibus testaceis, antennis fusco-ferrugineis basi apiceque 
dilutioribus ; prothorace fortiter punctato, ante angulos posteriores oblique impresso ; abdomine subtiliter 
punctulato. 
Long. 7 millim. 
Mas incognitus. 
Hab. Guatemaa, Tactic (Champion); Panama, Caldera 1200 feet (Champion). 
Compared with the corresponding sex of P. major, this insect is found to be con- 
siderably smaller, and to possess a smaller terminal joint to the antenne; the elytra 
are rather shorter, and the dorsal plates of the hind body are a little more punctate ; 
while from any of the following species its larger size and broader form leave no doubt 
of its distinction. The individual from Tactic may possibly, when the male is known, 
prove to be a distinct species, as it has a decidedly larger punctuation on the dorsal 
plates of the hind body, and the coloration is slightly different, the thorax and hind 
body being a little darker and the elytra a little paler in colour. 
Only a single individual has been found in each of the two localities. 
4, Platonica acuminata. 
Anterius et posterius evidenter acuminata ; ferruginea, capite nigricante, pedibus testaceis ; prothorace fortiter 
punctato, basi in medio vage depressa; elytris quam hic paulo longioribus, parce punctatis ; abdomine 
parce punctato. 
Long. 63 millim. 
Mas elytris ad latera breviter marginatis, carina subhumerali conspicua, ad angulum suturalem processu tri- 
angulari elevata; abdominis segmento dorsali in medio signatura opacula cuneiformi parum elevata, seg- 
mento sexto in medio plica longitudinali ad apicem paulo magis elevata. 
Hab. Mexico, Cordova (Hoge). 
The unique individual found of this species is a male, but is apparently without 
the denser punctuation of the middle of the thorax existing in that sex of several 
other species of the genus, and has a narrower head than usual. The antenne are 
more slender than in P. major, the fifth joint being scarcely transverse; there is a 
fine punctuation at the base of each dorsal plate ; and this is most distinct on the fifth 
segment ; there is no dilatation of the upper edges of the ventral plates. 
The species would appear to be most nearly allied to P. centralis; but the thorax is 
paler and rather more coarsely punctate, the elytra are scarcely marked with black 
at the outer angle, the antenne are stouter and paler in colour, the raised mark on 
the third dorsal plate of the male is much broader, but is less elevated, and the dorsal’ 
plates are a little more punciate. 
