360: STAPHYLINIDA. 
2. Gastrisus mimetes. 
Niger, subopacus; capite thoraceque fusco-subzneis, abdominis segmentis duobus ultimis rufis; elytris punctis 
distantibus, parum conspicue impressis. 
Long. 17 millim, 
Hab. Costa Rica (Van Patten). 
This species will be readily enough distinguished from G. opaculus by the rather 
coarser punctuation and by the two red apical segments. It possesses a great super- 
ficial resemblance to Lampropygus cognatus; and as the second dorsal plate has a well- 
marked transverse line impressed on it near the base, it really approaches that insect in 
the generic character. ‘There is also a shorter and more obscure line on the third 
plate: these impressions are, however, very imperfect compared with what exists in 
L. cognatus, and apart from them the species may be readily distinguished from 
L. cognatus by the duller anterior parts and the much less punctuation on the head> 
thorax, and elytra. 
Only a single specimen has been found; it is a male, and has a slight notch at the 
hind margin of the last ventral plate. 
ISANOPUS. 
Isanopus, Sharp, Trans. Ent. Soc. Lond. 1876, p. 141. 
This genus has hitherto comprised a single Amazonian species, which, like the 
I, salla@i here described, is known only by a single example. 
1. Isanopus sallei. (Tab. IX. fig. 3.) 
Gracilis, niger ; antennis rufo-fuscis basi nigricante, elytris cyaneis, abdominis segmentis duobus ultimis rufo- 
testaceis ; prothorace sparsim punctato, medio area longitudinali lata irregulari impunctata. 
Long. 17 millim. 
Hab. Mexico, Cordova (Sailé). 
_ Antenne very elongate, reaching to about the extremity of the elytra. Head coarsely 
punctate on either side, and with four or five punctures on the anterior part of the 
smooth middle space. Thorax longer than broad, narrowed behind. Scutellum black, 
with numerous coarse punctures. Elytra as long as the thorax, of a dark blue colour, 
coarsely punctate. Hind body slender, black, with slight iridescent reflections; the 
two apical segments and anal styles yellow, moderately closely and finely punctate. 
Legs black, the tarsi paler, rufescent at the extremity. 
The only individual known is a male. The front tarsi are greatly dilated, the last 
ventral segment has a rather deep notch at the tip, and the hind margin of the 
preceding segment is a little emarginate. 
The middle and hind feet are not very exactly rendered in the figure. 
