642 STAPHYLINIDA. 
very dense, the channel very indefinite. The elytra are a good deal longer than the 
thorax, and their sculpture is deep, dense, and rather coarse, consisting of punctures 
with extremely minute interstices. The hind body is slender, rather densely punctate, 
each of the four or five basal segments with a single distinct cusp in the middle near 
the base. The legs are flavescent, with the apical half of the femur fuscescent. The 
male has the penultimate ventral plate slightly but broadly emarginate at the hind 
margin, and with a short denticle on each side of the emargination. 
Though closely allied to S. renifer, this species has rather finer sculpture and shorter 
elytra; the elytral mark is so very indistinct that it can only be detected in certain 
lights, and when the wing-cases are quite clean and a little damp. 
8. Stenus championi. (Tab. XVII. fig. 3.) 
Nigerrimus, subopacus; abdomine cinereo-pubescente, palporum articulo basali pallido; dense sculpturatus, 
elytris apicem versus intricato-sculpturatis; abdomine parce obsolete punctato, segmentis basalibus ad 
basin profundius depressis, fere ecuspidatis. 
Long. 4 millim. 
Hab. Mexico, Jalapa (Hége), Guanajuato, Cordova (Sallé); GuaTEMALA, near the 
city, Panajachel, Duefias, Cerro Zunil, Paso Antonio, San Gerdénimo, Tactic, Senahu 
(Champion); Panama, Bugaba, Volcan de Chiriqui 4000 to 6000 feet (Champion). 
Antenne rather short, the joints of the club not longer than broad. Head nearly as 
broad as the elytra; interocular grooves moderately distinct, separated by a broad space, 
which is broader than the lateral space. Thorax rather small, subcylindric, being only 
slightly broader at its greatest width in front of the elytra. Llytra a little longer than 
the thorax, very densely sculptured, the sculpture on the apical portions somewhat 
confluent and tortuous. Male characters very slight, consisting of a very slight emar- 
gination of the hind margin of the last ventral plate. 
This is evidently one of the most abundant of the Staphylinide of our region. It 
does not agree with any of Casey’s descriptions, but is perhaps nearest to his S. arizone. 
The specimens from Chiriqui have the sculpture of the elytra decidedly more tortuous 
than is the case in examples from the more northern parts of our region. 
4, Stenus inermis. 
Nigerrimus, subopacus; abdomine cinereo-pubescente, antennis, palpis pedibusque piceis; dense sculpturatus ; 
abdomine parce obsolete punctato, segmentis basalibus ad basin profundius depressis, fere ecuspidatis. 
Long. 4 millim. 
Hab. GuateMata, near the city (Champion). 
Distinguished from certain examples of S. championi only by the comparatively pallid 
colour of the palpi, legs, and antenne; so that I am doubtful whether it may not be a 
variety; but as it is very rare to find variation in this respect in the species of this 
genus, and as I have no intermediate examples, I give it specific rank. 
Three specimens. 
