120 MR, A. BOUCARD ON THE GENUS PLUsioTIsS. __[ Mar. 2, 
capite aureo, margine anteriore rufo, parce punctulato ; thorace 
elytrisque aureo-pallidis subtiliter punctulatis, elytris leviter 
striatis, pygidio rufo ; infra rufa violaceo micans, tarsis cupreis, 
antennis fuscis. Length 1 inch 3 lines. 
Head, thorax, and elytra of a very pale burnished gold-colour, very 
slightly punctured, the anterior margin of the head rufous; elytra 
slightly striated, of about the same Jength as those of P. aurora, but - 
a little broader; pygidium rufous. ‘The underside also rufous, with 
red and purple reflections ; tarsi of a coppery colour, with the claws 
nearly black, antenne pitchy. 
Hab. Costa Rica. 
I have only one specimen of this very fine insect, which was col- 
lected by an American geologist, Professor Gabb. 
_ I dedicate this fine species to my esteemed friend Mr. H. W. 
Bates, the celebrated naturalist traveller, in honour of his numerous 
discoveries on the Amazons, and his important works on entomology. 
PLUSIOTIS CHRYSARGYREA. 
Pelidnota chrysargyrea, Sallé, Annales de la Soc. Ent. de France, 
tome iv. p. 362. 
This very handsome species comes close to P. éatesii, from which 
it differs chiefly in the colour, which is still more brilliantly metallic, 
and also in a broad rosy margin on each side of the thorax ; the legs 
and tarsi also differ in colour, being green with blue claws. 
My friend M. Auguste Sallé has recently published a diagnosis 
of this species in the Bulletin of the Entomological Society of France 
for the 12th of August 1874. He has two specimens, which were 
brought over from Costa Rica by Dr. van Patten. M. Sallé says 
that one of them is in colour just like qnicksilver, and the other 
golden. I have compared these specimens with P. resplendens and 
P. batesii, from which they totally differ, although these last-named 
species are also golden. These three species, with P. aurora, are 
among the most magnificent insects yet discovered ; and it is very 
probable that many more remain to be detected in Central America. 
As my esteemed friend M. Sallé says he intends to give a full 
description of this species, it is useless for me to do so, as he is better 
able than myself to do justice to the subject ; but I hope he will agree 
with me in placing this insect among the Plusiotides, as it has the 
characters by which this genus is distinguished from Pelidnota, 
Although these characters are slight, they seem to be constant. I 
think there are only three specimens of this fine insect known: two 
are in the collection of M. Sallé; and the other one is probably in 
Germany. I say this because I know for certain that Dr. van 
Patten had three specimens when he left London for Germany in 
1872. 
This species is one of my desiderata. 
PLusIoTIS MARGINATA, Waterh. Ent. Month. Magaz. 187], 
vol. vil. p. 5. 
P. marginata: oblongo-ovata, minus conveva, supra prasina, infra 
