PLATEROS. 23 
Antenne serrate, the joints narrowing towards the apex. Head black, with rather 
prominent eyes. Thorax round in front; hind angles acute, produced ; base divided in 
the centre, but not much elevated, nor truncate as in P. parallelus. Elytra gradually 
widening towards their apex, strongly crenate-striate, with a greyish look; the striz 
with distinct punctures. 
Among many Lycide obtained by me from the late Mr. Norris’s collection were two 
or three of the variety with a humeral stripe of this species ; these were named for me by 
M. Bourgeois “ P. marginellus, Macleay.” It would be impossible from the description 
alone to identify it with the Fabrician Lycus marginellus, which, indeed, would apply 
equally to other small species of other genera. There are at least four species of 
Calopteron so closely resembling this as to require careful study for their separation. 
14. Plateros flavicollis. 
Niger, prothorace, femoribus intermediis et posticis basi, scutello, humeris et sutura juxta scutellum flave- 
scentibus. Long. 5-53 millim. 
Hab. GUATEMALA, Zapote (Champion). 
It is with some hesitation I give this specific rank ; but even if it be only a variety 
of P. striatus, it is necessary to notice it. 
15. Plateros nicaraguensis. 
Niger, oblongus, parallelus; prothorace transverso, antice angustato, lateribus sinuatis, angulis posticis acutis, 
productis, ochraceo, vitta lata in medio nigra; elytris ochraceis, apice nigris, interstitiis alternis eleva- 
tioribus ; antennarum articulo primo et ore rufo-piceis. Long. 10 millim. 9. 
Hab. Nicaracua, Chontales (Belt). 
The form of this insect is not that of any of the species hitherto described. The 
antennee are compressed and narrow towards the apex; they are scarcely serrate. The 
prothorax is rather trapezoidal, with the base sinuate, much wider than the front, not 
notched in the middle; the front and the sides form an obtuse angle, the former being 
a little produced over the head; the basal channel is well defined, but the carina 
hardly traceable. The elytra are rather wide and flattish, with the usual ten series of 
punctures, which are, however, scarcely visible, owing to the fine yellow pubescence 
with which they are covered. The apical segment of the abdomen appears not to be 
divided in the middle. 
Only a single specimen was sent by Mr. Belt. 
16. Plateros ochraceus. 
Niger, prothorace elytrisque ochraceis, his striga subsuturali juxta scutellum nigra, illo transverso, antice 
angustato, basi canaliculato, utrinque subtuberculato, disco plus minusve nigro, canaliculo tamen flayo, 
angulis posticis acutis productis. Long. 7-9 millim. 
Hab. Guatemaua, Cubilguitz (Champion). 
