THINOPHILUS.—SCIOTROGUS. 707 
placed by previous writers in Thinobius. Possibly the North-American Thinobius 
brachypterus, Lec., may belong to it. 
1. Thinophilus dissimilis. 
Fusco-testaceus, antennarum basi pedibusque testaceis ; angustior, subparallelus, sat dense punctulatus, sub- 
nitidus ; prothorace leviter ineequali. 
Long. 14 millim. 
Hab. Panama, Bugaba (Champion). 
Very slender. Antenne rather stout, slightly thicker externally ; penultimate joints 
slightly transverse. Head subquadrate, truncate behind the eyes, the neck abrupt. 
Thorax transverse, the sides straight, very faintly punctulate; the surface rather 
uneven, the vague depressions most distinct near the base. Elytra long and narrow, 
extremely finely punctulate. Unique. 
SCIOTROGUS. 
Facies fere Aleocharinarum. Corpus elongatum, subdepressum. Antenne filiformes. Caput tuberculis anten- 
nariis haud discretis ; oculis parvis. Coxe anteriores subtransverse. Tarsi triarticulati, articulis basalibus 
brevissimis. Elytra apice truncato. 
I establish this genus upon a very interesting though obscure little insect, which makes 
in structure as well as in appearance a considerable approach to the “ Aleocharine” ; it 
is, however, undoubtedly a member of the “Oxyteline.” The antenne are eleven- 
jointed, not in the least clavate, inserted at the sides of the head close to the eyes, with 
only a very obscure tubercle over the point of insertion. The clypeus, though small, 
exists and is defined by an obscure suture. The eyes are small, coarsely faceted. The 
maxillary palpi are very short; the pseudo-terminal joint stout, subovate, with truncate 
extremity, the true terminal joint not visible. The prosternum is short, and the front 
coxe extend to near the sides, the side-piece behind the coxa being quite short and obtuse. 
The middle coxz are small and contiguous. The legs are rather short, compressed ; 
the tibize broader in the middle than at the extremity, and without spines. The tarsi are 
very small. The hind body is margined, and very similar to that of the “ Aleocharine.”’ 
‘The elytra are truncate at the extremity. The texture of the surface and the minute 
pubescence are more suggestive of the Trogophiai than of any other Staphylinide. 
The examples are in a very decayed condition: most of them appear to have lost 
their palpi, and I cannot see the exact form of the two basal joints of the tarsi. The 
insertion of the antenne under the edge of the side of the head renders it clear that 
the insect cannot be placed in the subfamily “ Aleocharine,” and I think the genus 
truly belongs to the group “ Thinobiina.” 
1. Sciotrogus opacus. (Tab. XVIII. fig. 23.) 
Fusco-cinnamomeus, pedibus testaceis; omnino obsoletissime punctatus, peropacus. 
Long. 24 millim. 
Hab. Paxama, Bugaba (Champion). 4 XX 2 
