626 STAPHYLINID A. 
The basal segments of the hind body vary in colour according to the maturity of the 
individual; when quite immature all the segments are rufescent, even though the head 
and thorax have nearly attained the ordinary black pigmentation. 
15. Pinophilus agilis. (Tab. XVI. fig. 16.) 
Gracilior, nitidus, rufus, capite abdomineque nigris; antennis, palpis pedibusque pallide flavis; prothorace 
haud transverso, lateribus rotundatis, basin versus angustatis, fortiter punctato. 
Long. 11 millim. 
Hab. Panama, Caldera in Chiriqui 1200 feet (Champion). 
This insect, though excessively similar to P. basiventris and P. reflexus, is readily distin- 
guished by the bright red thorax, concolorous with the wing-cases; it agrees in this 
respect with the Amazonian P. bicolor, which species indeed it almost exactly resembles, 
but the male characters seem to indicate that the two are distinct. In P. agilis the 
ventral plate of the last segment is narrowed towards the apex in a curvilinear manner ; 
the apex of the ventral valve of the segment of the armature is bent upwards at the 
extremity, but at the very apex it again becomes nearly longitudinal in its direction, and 
it exhibits behind a large orifice caused by an emargination that has an angular tooth at 
its base. In P. bicolor the sides of the last ventral plate are not curvilinearly narrowed, 
and the angular tooth of the ventral valve is represented by a very slender projection. 
Unique. 
16. Pinophilus validus. 
Robustior, nitidus, niger, laxe pubescens, elytris rufis ; antennis, palpis pedibusque flavis, geniculis posterioribus 
late fuscis ; prothorace leviter transverso, lateribus rotundatis, basin versus angustatis, fortiter irregulariter 
punctato, medio linea impunctata sat discreta. 
Long. 15 millim. 
Hab. Mexico, Jalapa (Flohr), Cordova (Sallé) ; Guaremata, Cerro Zunil 4000 to 5000 
feet, El Tumbador, Senahu (Champion); Nicaragua, Chontales (Belt). 
Very similar to P. penetrans, but more robust. The thorax is distinctly broader 
than long, the punctuation is more crowded along the middle on either side of the 
rather irregular and indistinct median space; the elytra are a little longer than the 
thorax, very coarsely punctate, slightly fuscescent at the extreme base. In the male 
the ventral plate of the last segment is strongly sinuate at the sides, moderately broad 
and scarcely emarginate at the apex; the ventral valve of the segment of the 
armature is of peculiar form, flat at the base, a little beyond which it is directed 
slightly upwards, forming a very obtuse angle; the apex of the valve is prolonged, bent 
downwards, and divided by a very narrow deep incision into two almost contiguous lobes. 
We have received four examples from Guatemala, and the description is made from 
these specimens ; from Nicaragua we have only one female, and from Mexico only two 
specimens of the same sex; there is a little doubt therefore whether these last-named 
