208 STAPHYLINID A. 
rather narrower than the thorax; its surface impunctate and shining, the eyes occupying 
nearly the whole of the sides. Thorax transverse, a good deal narrower than the 
elytra, slightly narrowed behind, the surface with a rather coarse tubercular sculpture 
which does not extend to the margins, and is more scanty along the middle. Elytra 
longer than the thorax, narrowed at the shoulders, yellow but becoming dark behind, 
very shining, with a very distant punctuation, consisting rather of obsolete granulations 
each bearing a fine seta than of impressed punctures. Legs very long, tibial spurs very 
inconspicuous. 
The unique individual described is immature, and is probably a male; the basal 
dorsal plates of the hind body are very polished and quite impunctate ; but the fifth 
has some coarse punctures across the middle, and the sixth is rather closely and coarsely 
punctate; it is dull and has at the hind margin three very obscure tubercles; the 
seventh segment is a little produced in the middle behind, and its hind margin is 
obscurely crenulate. 
This species is an anomalous one, and should probably form a distinct genus, as the 
head is furnished with a moderately distinct neck. It is apparently more nearly allied 
to the Amazonian I. nitidula than to any other species. 
19. Myrmedonia teres. 
Brevior, lata, nitidula, picea, capite thoraceque fere nigris, antennis fuscis, apice rufo, pedibus testa- 
ceis ; thorace transversim quadrato, quam elytra angustiore, fere impunctato ; his quam thorax vix longi- 
oribus, vix punctatis, sparsim setulosis; abdomine lato, basi polito, levigato, segmento sexto (maris) 
dense fortiterque punctato. 
Long. 33 millim. 
Hab. Panama, Bugaba, 800 to 1500 feet (Champion). 
Antenne not largely developed, loosely articulate and conspicuously setose ; the basal 
joint is sordid yellow, the following joints fuscous; but at the apex the joints again 
become gradually paler, so that the terminal one is nearly yellow; third joint slender, 
rather longer than second, fourth slender, much longer than broad, from this to the tenth 
each a little broader than its predecessor, the ninth being about as long as broad, and 
the tenth slightly transverse, terminal joint as long as the two preceding together. 
Head very short, truncate behind, eyes not occupying all the sides; the surface very 
shining, with obsolete but setigerous punctures on each side. Thorax broader than 
long, but a good deal narrower than the elytra, nearly straight at the sides; the surface 
very shining, almost impunctate, but bearing some fine hairs. LElytra broad and short, 
slightly narrowed at the shoulders, of a piceous colour, very shining, sparingly and 
obsoletely punctate, but the punctures evidently setigerous. Hind body broad, very 
polished, the lateral margins broad; the fifth segment with fine but quite definite 
sparing punctures; sixth segment red, densely punctate just in front of the hind 
margin, with three or four excessively indistinct minute tubercles; hind margin of 
