STENUS. 645 
thorax, deeply and coarsely rugose-punctate, the interstices more or less obliterated, so 
that the surface appears corroded. Hind body with a scanty but distinct setosity, the 
segments rather coarsely punctate at the extreme base, elsewhere almost impunctate, 
without true cusps. Male with the femora distinctly incrassate, and the middle and 
hind tibize mucronate internally at the apex: the ventral plates from the second 
onwards a little deplanate, the terminal plate with a very long narrow angular excision. 
Three examples. 
10. Stenus zunilensis. 
Niger, nitidus, eneo-tinctus ; palpis flavis, pedibus antennisque testaceis, his clava fusca; elytris densius 
fortiterque rugoso-punctatis ; abdomine parce punctato, parcius flavo-pubescente. 
Long. 43 millim. 
Hab. GvaTEMALA, Cerro Zunil 4000 to 5000 feet (Champion). 
This insect is similar to S. mucronatus, but is shorter, and the interocular grooves 
are less distinct and separated by a rather broad slightly elevated space; the punctuation 
of the elytra is rather denser and finer, the pubescence of the hind body is shorter, 
and the male characters different. In the male sex the legs are nearly simple, though 
there exists an excessively minute mucronation of the middle tibia, and a very slight 
incrassation of the femora; and the terminal ventral plate has only a broad short 
angular excision. ‘l'wo examples. 
11. Stenus corrosus. 
Niger, sat nitidus, eneo-tinctus; palpis flavis, pedibus testaceis; antennis basi rufescente, apice nigricante ; capite, 
prothorace elytrisque dense fortiterque rugoso-punctatis; abdomine parce punctato, longius pubescente. 
Long. 63 millim, 
Hab. Panama, David, Pefia Blanca 4000 to 5000 feet (Champion). 
Very closely allied to S. mucronatus, but with a longer less globose thorax and 
rather longer elytra. The male characters are almost the same, but the legs are longer, 
and the hind tibiz are sinuate internally near the apex. We have only one example 
from each locality. 
12. Stenus punctiventris. 
Niger, eneo-tinctus; palpis flavis, pedibus testaceis, antennis fusco-testaceis ; prothorace elytrisque dense pro- 
fundeque rugoso-punctatis ; abdomine densissime punctato. 
Long. 6 millim. 
Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 
Palpi elongate. Antenne moderately long. Head broad, a little excavate, and 
bisulcate along the middle, the intervening space being rather broad, not at all carinate. 
Thorax densely covered with deep corroded sculpture. Elytra scarcely longer than the 
thorax, sculptured like it. Hind body very densely punctured, the pubescence neither 
extremely short nor elongate. 
