272 STAPHYLINIDA. 
This species is readily distinguished by its slender but not elongate antenne. Only 
two individuals have been found, and they are apparently both females. 
8. Placusa longicornis. (Tab. VI. fig. 10.) 
Depressa, posterius minus acuminata, haud dense punctata, nitida, nigricans, antennarum basi pedibusque 
sordide testaceis, abdominis segmentis basalibus plus minusve rufescentibus ; antennis gracilibus, elongatis, 
articulo singulo quam latitudo longiore. 
Long. 24 millim. 
Hab. Panama, Bugaba (Champion). 
Antenne elongate and slender, not thickened outwardly; third joint elongate, quite 
as long as the second; fifth joint considerably, tenth very slightly, longer than broad ; 
terminal joint elongate, but not so long as the two preceding together. Palpi yellow. 
Thorax transverse, evidently narrower than the elytra, a little rounded at the sides and 
slightly narrowed in front, finely and distinctly, not very closely punctate, but little 
convex transversely. Elytra a little longer than the thorax, similarly punctate, frequently 
with a vague paler patch of colour near the suture behind. Hind body closely and 
extremely finely punctate, shining. 
In the male the hind margin of the dorsal plate of the seventh ventral segment is 
armed in the middle with an extremely minute short tooth, and on each side of this are 
two longer, closely approximated teeth, of which the inner is the longer; at the outside 
there is another, slender and slightly longer tooth; the interval between this and the 
two approximate teeth is rather greater than that between the latter and the middle 
tooth. 
Sixteen individuals have been found; they vary a little in colour, but are, I fancy, all 
immature; possibly in fully mature individuals the reddish patch on the elytra, as well 
as the similar tint of the basal segments, would be scarcely visible. 
9. Placusa longipes. 
Depressa, posterius acuminata, crebrius punctata, picea, abdomine rufescente, antennarum basi pedibusque 
testaceis ; antennis gracilibus, articulis omnibus elongatis. 
Long. 33 millim. 
Hab. Guaremata, San Gerénimo (Champion). 
Antenne very elongate, as long as head, thorax, and elytra, not thickened externally ; 
third joint elongate, longer than the second, each of the following joints longer than 
broad; terminal joint elongate, but not so long as the two preceding together. Thorax 
strongly transverse, a little rounded at the sides, not narrowed in front, rather closely 
and not very finely punctate. Elytra a good deal longer than the thorax, similarly but 
rather more closely punctate. Hind body elongate, very densely and finely punctate. 
Legs yellow, elongate. 
In the male the hind margin of the dorsal plate of the seventh segment of the hind 
