PTEROPLATUS. 73 
1. Pteroplatus quadriscopulatus. 
Pi. variabili (Sallé) simillimus, at differt utroque sexu articulis antennarum 3°-6" dense penicillatis. Elongatus, 
postice modice dilatatus, niger vel nigro-violaceus, pilosus, elytris humeris late fasciaque mediana fulvis, 
vel nigris humeris tantum fulvis; capite thoraceque fulvis, illo vertice vittaque occipitali, hoc vittis tribus, 
fulvis ; corpore subtus medio interdum fulvo. 
Long. 6-7 lin. ¢ @. 
Hab. Guatemata, Zapote, Capetillo (Champion). 
Closely resembling Pt. variabilis, Sallé (Caraccas, Venezuela); variable in colours 
like that species, though not quite in the same manner, and in shape offering no per- 
ceptible difference. It differs, however, constantly in both sexes in having the antennal 
joints from the third to the sixth furnished on one side with a long and very dense 
brush of silky hairs, Pt. variabilis having such a brush only on. the sixth joint. 
2. Pteroplatus sellatus. 
Pieroplatus sellatus, White, Cat. Col. Long. B. M. i. p. 82, t..3. fig. 3'; Bates, Trans. Ent. Soc. 
1872, p. 192°. 
Hab. Muxico!, San Gerénimo (Champion); Nicaragua, Chontales (Belt). 
Differs from Pt. quadriscopulatus in the form of the thorax, which is trapezoidal, 
with nearly straight sides, instead of bulging in the middle. The colours are nearly 
the same. 
3. Pteroplatus octocostatus. 
Subtriangularis, elytris mox ab humeris gradatim ampliatis, apice minus obtuse rotundatis. Niger, brevissime 
‘pilosus, subtus (thorace fulvo excepto) niger, pedibus nigro-piceis ; supra pallide fulvus, thorace lineolis 
duabus brevibus elytris fere dimidio postico nigro-violaceis; thorace parvo lateribus medio distincte angu- 
latis ; scutello nigro ; elytris utrinque costulis angustis quatuor, quarum prima obliqua paulo post medium 
suturam attingit; inter 2™ et 3™ costula postica incompleta, ibique superficie reticulata; antennis 9 bre- 
vissimis, breviter pilosis ; femoribus paullo incrassatis, haud pedunculatis. 
Long. 64 lin. Q. 
Hab. Mexico (Boucard). 
The form of body is similar to that of Pt. lycoides; but the elytra are more broadly 
dilated, and the thorax is relatively smaller, besides wanting the constriction at the 
base which is seen in that and other species of the genus. The large number of 
narrow and sharp elevated lines of the elytra are also a distinguishing character of 
Pt. octocostatus. 
4, Pteroplatus pallidus. 
Pteroplatus pallidus, Thomson, Class. Long. p. 255. 
Hab. Mexico. 
BIOL. CENT.-AMER., Coleopt., Vol. V., June 1880. l 
