504 STAPHYLINIDA. 
The only example obtained of this species is almost exactly similar to M. filarius, 
except for the definitely pallid base of the hind body. It is also, however, rather more 
slender than MV. filarius, has the elytra a little shorter, and not quite so smooth. 
§2. Capite subtus plano. 
4. Metoponcus longiceps. (Tab. XIII. fig. 10.) 
Angustior, elongatus, subcylindricus, nigerrimus, nitidus, fere levigatus; capite inter antennas compresso- 
spinoso; antennis latiusculis, brevibus, picescentibus. 
Long. 5-6 millim. 
Hab. Panama, Bugaba, Volcan de Chiriqui 2500 to 4000 feet (Champion). 
Head very long and narrow, longer than the thorax ; the antenne very approximate, 
and the front between them compressed and produced so as to form a sort of short horn 
or spine. Thorax elongate and narrow, straight at the sides, very shining black, with 
about three very fine punctures on each side of the middle, representing the longitu- 
’ dinal series, and about three others, equally fine, on each side. LElytra polished, about 
as long as the thorax. Underside of the head without any trace of margin or lateral 
channel, polished and impunctate. 
Two examples were found of this remarkable little insect, the one figured being that 
found on the Volcan de Chiriqui. 
5. Metoponcus varians. (Tab. XIII. fig. 9.) 
Niger, nitidus; pedibus rufis, antennis piceo-rufis ; capite punctis impressis ; prothorace seriebus dorsalibus 
subtiliter 5-punctatis. 
Long. 53-10 millim. 
Hab. Muxico (Truqut), Cordova (Hoge); Guatemata, Volcan de Fuego 6400 feet 
(Salvin), Capetillo, San Gerdnimo, Cerro Zunil, Quiche Mountains 7000 to 9000 feet, 
Totonicapam 8500 to 10,500 feet (Champion). 
Head closely and excessively finely strigose, so that its lustre is a little dulled, 
bearing a few irregularly placed rather large punctures. Thorax narrowed behind, a 
good deal sinuate at the sides in the middle, like the head finely strigose, and on each 
side of the middle with a series of five or six distant small punctures, and with one or 
two still smaller punctures outside these. Elytra as long as the thorax, minutely punc- 
tulate and setulose. 
If I am right in considering the specimens from the above localities as all one 
species, Metoponcus varians is very variable in size; the smaller examples resemble 
almost exactly M/. filarius, and were probably found in company therewith, Mr. 
Champion having mounted the two on one card; J. varians is, however, readily 
identified by the absence of any trace of channel at the side of the head beneath, and 
by the prothoracic dorsal punctures. Mr. Champion found a good series of the present 
