664 STAPHYLINIDZ. 
emargination in the middle of the hind margin; the last ventral segment has an incision 
that is very deep and very narrow in front; the preceding segment is broadly depressed 
behind, and densely set with very minute, almost snow-white, pubescence, the hind 
margin being emarginate. 
Though this insect is extremely similar to S. albipes, the male characters are nearer 
to those of §. cylindricus; it differs from the former in having the elytra rather 
narrower, less convex, and not quite so coarsely punctured. It is only half the size of 
S. cylindricus, has the dorsal plate of the last true segment more punctured, and the male 
characters a little different, the extremely narrow elongate incision being remarkable. 
Unique. 
57. Stenus albipes. 
Elongatus, nigerrimus, nitidus ; antennis, palpis pedibusque pallide flavis ; capite fere plano, sat crebre punctato ; 
prothorace elytrisque fortiter punctatis, illo cylindrico. 
Long. 4 millim. 
Hab. Mexico, Teapa, Cordova (Sallé), Jalapa (Hoge); British Honpuras, R. Hondo 
(Blancaneaux) ; GuateMaLa, Zapote (Champion); Nicaracua, Chontales (Janson). 
Antenne and palpi very elongate. Head moderately broad, nearly flat, moderately 
closely and coarsely punctured. Thorax narrow, almost perfectly cylindrical, being very 
nearly straight at the sides. Elytra rather convex, scarcely longer than the thorax, 
very coarsely punctured, very shining. Hind body rather sparingly, coarsely punc- 
tured, the terminal segments nearly impunctate. Legs very pale yellow. Male with 
the segment of the armature small and simple, the last ventral plate with a moderately 
large and deep excision, the preceding segment feebly pubescent on the middle. 
Besides being only half the size of S. cylindricus, this species has a more closely 
punctured head and different male characters. We have a fair series from Mexico 
and British Honduras, one exponent from Guatemala, and several from Nicaragua; the 
specimens from these latter two localities do not quite agree, but as the external 
male characters are almost the same, they cannot be satisfactorily separated. 
58. Stenus cylindricollis. 
Angustus, cyaneo-niger, nitidus ; antennis, palpis pedibusque flavis; capite sat lato, leviter excavato, parcius 
punctato, nitido; prothorace cylindrico, crebrius fortiterque punctato, nitido; elytris fortius punctatis, 
nitidis; abdomine parce punctato. 
Long. 5 millim. 
Hab. British Honpuras, R. Hondo (Blancaneauz). 
This species is similar in size and punctuation to S. albipes, but, besides the cyaneous 
colour, it exhibits other distinctions, the head being a little excavate and more sparingly 
punctured, and the punctuation of the hind body less. It is one of the species in which 
the upper surface is almost completely destitute of pubescence. One female. 
