20 MALACODERMATA. 
3. Plateros letourneuri. (Tab. II. fig. 17.) 
Niger, prothorace elytrisque ochraceis, his sutura basi infuscata; illo disco utrinque nigro-vittato, angulis 
posticis acutis, parum productis. Long. 10-11 millim. ¢ 2. 
Hab. Mexico, Cordova (Sallé); British Honpuras, river Sarstoon (Blancaneaus) ; 
GUATEMALA (Sallé). 
In one example the crown of the head and the mouth are ochraceous. The sides of 
the thorax contract slightly from the base; the central yellow line is characteristic ; and 
the alternate interstices are more strongly raised than in the species which are nearly 
allied. 
A Guatemala specimen is shown in the Plate. 
4, Plateros evanidus. 
Niger, prothorace elytrisque ochraceis, his sutura basi, illo vitta mediana nigris, lateribus subsinuatis, angulis 
posticis acutis, productis. Long. 10-11 millim. 
Hab. Mexico, Oaxaca (Sallé); Guatemaa, Chacoj, Pancina, Teleman (Champion) ; 
NicaraGua, Chontales (Belt) ; Costa Rica (Van Patten). 
Closely allied to P. letourneuri, and only differing in having the hind angles of the 
thorax more turned outwards, the elytra evenly striate with the four alternate inter- 
stices scarcely more raised, and the carina of the thorax black. The Costa-Rica 
specimens are darker ; and the angles of the thorax in them are less prominent. 
5. Plateros apicalis. 
Niger, prothoracis lateribus, elytrorum dimidio basali, ore, antennarum articulo apicali pedibusque basi interne 
flavis; elytris interdum linea brevi basali prope suturam nigra. Long. 63-10 millim. 
Hab. Nicaraeua, Chontales (Lelé). 
Only two specimens of this species have been sent at present; and they seem very 
distinct from any other. The apical joint of the antenne is yellow; the yellow sides 
of the thorax join in front, leaving a black vitta occupying the disk, in one specimen 
reaching neither base nor front margin. The sculpture of the thorax is irregular, that 
of the elytra close, with slightly raised alternate coste. 
6. Plateros luridus. 
Nigro-fuscus, capite, antennarum articulo apicali, prothorace, elytris, scutello, pedibus basi et pectore ochraceis ; 
elytris punctato-striatis, interstitiis alternis elevatis ; vitta thoracica, sutura ad basin vel linea subsuturali 
interdum nigro-fuscis. Long. 9-10 millim. 
Hab. Nicaracua, Chontales (Belt) ; Panama, var.?, Matachin (Thieme). 
Extremely close to P. evanidus, and hardly to be distinguished, except by the 
antenne, of which the joints are more acutely serrate, their internal apical angles 
being produced, and the apical joint yellow. This, however, does not seem to be the 
case with some specimens lent me by M. R. Oberthiir, which have acutely serrate 
