PADERUS. 615 
15. Pederus antiquus. 
Gracilis ; capite, metasterno abdominisque apice nigris; mandibulis, prothorace, mesosterno abdominisque basi 
rufis ; antennis, palpis pedibusque testaceis, illis medio, tibiis femorumque apicibus fuscescentibus ; elytris 
cyaneis, prothoracis longitudine, parce punctatis. 
Long. 9-10 millim. 
Hab. Mexico, Minas Viejas (Palmer). 
Antenne very elongate. Head broad, the vertex on either side evidently broader than 
the neck. Thorax longer than broad, a good deal narrowed behind. Elytra coarsely 
and sparingly punctured. Joints 4-8 of the antenne dilute fuscous; the apices of the 
middle and hind femora fuscous, and all the tibie fuscescent for the greater part of 
their length. 
This species is very similar to the smaller examples of P. yucateca, but is rather 
more slender ; the elytra are a little shorter, the cedeagus is totally different, and the 
hind margin of the last ventral segment is tridentate in the female. 
We have received only one pair. 
16. Pederus arduus. 
Alatus, niger; elytris quam prothorax paullo longioribus, cyaneis ; mandibulis, prothorace, abdominis segmentis 
quatuor primis mesosternoque rufis; antennis, palpis pedibusque testaceis; antennis medio femorum 
apicibus tibiarumque basibus nigricantibus. 
Long. 10 millim. 
Hab. Panama (Salvin), Volcan de Chiriqui 4000 to 6000 feet, Bugaba (Champion). 
This is extremely similar to P. yucateca, but is a considerably smaller insect, having 
the elytra of a beautiful blue colour, and the thorax rather smaller. The cedeagus in 
the two is so very different that no question can be entertained as to the distinctness of 
the two species. 
The only male I have seen came into my possession with Mr. Janson’s collection 
fifteen years ago, and was labelled “ Panama (Salvin).” Mr. Champion’s specimens are 
females, and, though broader, are apparently the same species; they have the lateral 
angles of the last ventral segment quite obtuse, as in P. yucateca, but the cedeagus is 
nearer to that of P. antiquus, though abundantly different therefrom. Three slender 
styles project from the basal lobe, and are of nearly equal length in P. ardwus ; whereas 
in P. antiquus the middle style is only half the length, and is moreover different in 
form. I do not think there will be any marked difference in the shape of the head 
of the sexes of P. arduus. 
17. Pederus antoniensis. | 
Gracilis, alatus ; capite, metasterno abdominisque apice nigris ; mandibulis, prothorace, mesosterno abdominisque 
basi rufis; palpis, antennis pedibusque testaceis, femorum posteriorum apicibus antennarumque articulis 
4°-7™ fuscescentibus ; elytris viridescentibus, quam prothorax longioribus, crebrius fortiter punctatis. 
Long. 9 millim. 
