518 STAPHYLINIDA. 
head, and the colour is usually not so dark, especially on the underside. The male 
has a small setigerous impression on the third ventral plate, and on the fourth plate 
an obsolete very small fovea; this plate projects backwards as a very broad short lobe, 
not reaching so far back as the hind margin of the following segment. 
The colour varies somewhat in this species; frequently the base and sides of the 
wing-cases are rufescent, and sometimes this colour is only visible on them as an obscure 
humeral spot. 
Banks of streams (Champion). 
28. Cryptobium guatemalense. 
Subdepressum, nigrum ; antennis rufis, pedibus testaceis ; capite latiusculo, crebre subobsolete punctato, opaco ; 
prothorace cylindrico, nitido, crebrius fortiter punctato, opaco, linea mediali parum lata impunctata; elytris 
quam prothorax paullo longioribus, creberrime sat fortiter et subrugulose punctatis; abdomine parce 
punctato, fere opaco. 
Long. 10-11 millim. 
Hab. Guatemata, Paraiso 300 feet, San Gerdnimo (Champion); Nicaragua, Chontales 
(Janson). 
This species is very closely allied to C. stygicum, but the male characters agree rather 
with those of C. tinctipenne, and the elytra are a little shorter, being not more than one 
sixth longer than the thorax; the head, too, is not quite so dull, and its punctuation 
is rather closer and less obsolete; as a series of seven examples is constant in these 
respects I must consider them to represent a species distinct from either C. stygicum or 
C. tinctipenne. From San Gerdnimo only a very damaged example has been received, 
and there is only one exponent from Nicaragua. 
29. Oryptobium puncticolle. 
Subdepressum, nigrum ; antennis rufis, pedibus testaceis ; capite latiusculo, dense subobsolete punctato, peropaco ; 
prothorace cylindrico, nitido, dense fortiter punctato, linea mediali antice fere interrupta, impunctata ; 
elytris quam prothorax longioribus, creberrime sat fortiter et subrugulose punctatis; abdomine fere opaco. 
Long. 10 millim. 
Hab. Guatrmata, San Isidro 1600 feet, Zapote (Champion). 
This species also is extremely close to C. stygicum, but the punctuation of the head and 
thorax is a good deal, and that of the elytra slightly, denser; the elytra also are rather 
shorter. It is equally near to C. guatemalense, but the more dense punctuation of the 
head will not permit me to unite the two. The two examples obtained do not quite 
agree, that from Zapote having the head rather more densely punctured and less dull, 
and the male characters as in C. tinctipenne, whereas in the type the fovea of the fourth 
segment of the male is entirely obsolete. 
30. Cryptobium modestum. 
Subdepressum, sat latum, nigrum, nitidum; antennis rufis, pedibus testaceis; capite latiusculo, crebre subob= 
