502 STAPHYLINIDZA. 
in form, but is distinguished by several characters from Nudobius, near which it should 
be placed. The prothoracic pleura is very short, owing to the early deflection of the 
superior line; this is continued on the under surface as far as the neck, while the 
inferior line ceases behind the prosternum, being for some considerable distance on the 
anterior part of its course extremely approximate to the superior line. The genus in 
appearance is most similar to the European Gauropterus, from which it differs by the 
comparatively wide separation of the antennz and the correlative development of the 
labrum, which is furnished on each side with a well-marked, angular, corneous projec- 
tion, as also by the larger development of the terminal joint of the maxillary palpi. 
1. Saurohypnus scutellaris. 
Elongatus, angustulus, minus depressus, niger ; elytris rufis; pedibus, palpis antennisque piceis, illis articulo 
basali nigro; prothorace elongato, ad latera sat crebre punctato; capite quam thorax paulo latiore, 
crebrius fortiter punctato, nitido; elytris fortiter profundeque punctatis. 
Long. 12 millim. 
Hab. Mexico, Pinos Altos in Chihuahua (Buchan-Hepburn). 
Scape of antenne elongate; third joint a good deal longer than the second. Head 
oblong, with numerous coarse punctures, but quite shining. Thorax a good deal 
narrowed towards the base, the front angles rather prominent, very shining black, 
near the sides with some deep irregularly placed punctures, without trace of discoidal 
series. Scutellum with five or six very large punctures. FElytra as long as the thorax, 
with numerous deep distinct punctures. Legs piceous; tarsi red. 
NUDOBIUS. 
Nudobius, C. J. Thomson, Sk. Col. ii. p. 188; Rey, Col. Fr. Xantholin. p. 83. 
This is a perfectly valid genus, though rejected by Fauvel, and consists of two or 
three species found in Europe, North America, and Japan. The European JX. lentus 
lives under the bark of dead trees, and this is probably the case with the species found 
in our region. 
1. Nudobius celatus. (Tab. XII. fig. 25.) 
Angustulus, parallelus, elongatus, niger, nitidus; antennis pedibusque fusco-rufis, capite parce sat fortiter 
punctato ; prothorace seriebus dorsalibus subtiliter 7-punctatis, lateribus parum punctatis. 
Long. 8 millim. 
Hab. Mexico (Truqui, Flohr), San Andres (Sallé), Oaxaca (Hoge); GuaTEMALaA, 
Balheu (Champion). 
This species, though bearing a great resemblance in appearance to the small black 
Aantholini (such as X. fumatus and X. resectus), may be, independently of the 
generic characters, distinguished from them by the existence of an extremely minute 
distant punctuation on the surface of the head and thorax. The coarse punctures on 
