MALACODERMATA. 241 
quarto tribus basalibus subaquali. Elytris longis, costis quatuor elevatis, intervallis confluenter subrugose. 
biseriatim punctatis. Long. 8-84 millim. 
Hab. GUATEMALA, Sinanja valley (Champion). 
Distinguished among its allies by the nearly black thorax and by the length of the 
elytra. The antenne are black, with the third joint shorter than in P. terminalis. 
The thorax has no carina; the sides of the channel are obsoletely quadrituberculate. 
Three specimens have occurred. 
14 (s). Plateros fusiformis. 
Niger, subnitidus ; prothorace flavo, disco nigrescente ; antennis latiusculis, vix serratis ; elytris antice posticeque 
angustatis, interstitiis alternis distincte elevatis, intervallis biseriatim irregulariter cellulatis. Long. 7-8 
millim. ¢ 9. 
Var. Thorace toto flavo. 
Hab. GuatemMaLa, San Gerénimo, Purula (Champion); Panama, Volcan de Chiriqui 
(Champion). 
The distinguishing character of this species is the manner in which. its elytra. widen 
gradually from the shoulders to the middle, and from there narrow to the apex. This 
combined with the sculpture, which looks as though the elytra were sulcate, gives it a 
very different appearance from any other species. Of five specimens from. Chiriqui 
two are of the variety, the other three having the disc of the thorax black. The 
sulcus is roughly formed, more or less elongate, while hardly any trace of a carina can 
be seen. The examples from Purula have darker thoraces, the lateral limb only being 
pale ; they are also smaller. 
15 (a). Plateros bugabensis. 
Fumeo-niger, subopacus ; prothorace nitidulo lateribus testaceis ; elytris plaga humerali, plus minusve producta, 
brunnea. Long. 5-53 millim. ¢ 9. 
Hab. Panama, Bugaba, David (Champion). 
Closely allied to P. apicalis; the antenne are concolorous in both sexes and less 
pubescent ; the thorax has scarcely any trace of a carina, but a wide not well defined 
basal channel, and the elytra have a wide shoulder stripe, with a broadly black suture, 
and more of the apical half black than in P. apicalis. The females of this, and of some 
other species, may be known by the thorax having a longer and deeper central channel, 
with the hind angles less produced. 
A large number of this species were found at Bugaba. 
Plateros ochraceus (p. 23). 
To the localities given, add:—Nicaracua, Chontales (Belt); Panama, Volean de 
Chiriqui, Bugaba (Champion). 
BIOL. CENTR.-AMER., Coleopt., Vol. III. Pt. 2, October 1884. 2L 
