628 STAPHYLINID. 
Antenne slender, reaching much further back than the base of the thorax. Head 
with the punctuation on the vertex coarse and extensive, separated from the discoidal 
sculpture by a narrow curvate space. Thorax very nearly as long as broad, curved at 
the sides and narrowed behind, very coarsely punctate, with an irregular space along the 
middle impunctate. Elytra elongate, much longer than the thorax, sparingly and very 
coarsely punctate. Hind body sparingly punctate. Legs immaculate, pale yellow. 
In the male the last ventral segment is much prolonged and has an obtuse, but not 
truncate, extremity ; the segment of the armature has the dorsal plate extended 
beneath so as to greatly overwrap the ventral valve. 
This species is nearest to the Amazonian P. laxus, but is abundantly distinct. In 
the small series of examples before me the extent to which the ventral valve of the 
male is enwrapped by the dorsal plate is variable, and I suspect there will prove to be 
two species in the series; but the specimens are so decayed and fragile that they cannot 
be submitted to a sufficiently prolonged examination. I am not able to point with 
certainty to any other character likely to distinguish the two forms. The type is that 
in which the enwrapping of the ventral valve is so very complete that only its tip can 
be seen. 
LATHROPINUS. 
Mandibule dentate, dente oblique truncato. Labrum brevissimum, medio leviter emarginatum. Antenne 
recte. Prothorax oblongus. Tarsi anteriores lati, subrotundati, intermedii et posteriores articulo quarto 
parvo. Tibise intermediz extus spinose. 
The insects for which I propose this new genus are apparently mimetic, resembling 
species of Lathrobiwm and Ocypus more than their congeners. Independently of this 
peculiar facies they may always be recognized by the spines on the outer side of the 
middle tibie, and by the eyes being placed at the sides of the head, greatly in front of 
the hind angles. 
The species of our region and P. tenuis, modestus, and mimus, Sharp, are the typical 
forms of the genus and resemble Lathrobia; the larger forms of American Pinophile 
that resemble Ocypus must also at present be included in the genus, viz. P. tenebrosus, 
Er., P. dua, rectus, wqualis, and ater Sharp, and no doubt also P. major, Brullé, 
P. fulvipes, Er., and P. subtilis, Arrib. The genus Arwocerus resembles these larger 
Lathropini in its facies, and has the middle tibie imperfectly spinose externally, but is 
well distinguished from Lathropinus and all the other Pinophili by its edentate mandibles. 
1. Lathropinus parallelus. (Tab. XVI. fig. 17.) 
Elongatus, subdepressus, piceo-niger, nitidus; antennis, palpis pedibusque rufis. 
Long. 12 millim. 
Hab. Mexico, Cordova (Sallé). 
Antenne slender, extending rather further back than the base of the thorax. Head 
