NUDOBIUS.—METOPONCUS. 503 
the head are absent from the middle: the thorax is distinctly narrowed behind, is 
elongate, and, in addition to the dorsal series, has about six other fine punctures placed 
in a curved series at the side. The elytra are as long as the thorax, rather coarsely, 
moderately closely punctured, shining. The underside of the head is more closely and 
regularly punctate than the upper. 
From the various sources nine examples have been procured. The one figured was 
found under pine bark at Balheu. 
METOPONCUS. 
Metoponcus, Kraatz, Nat. Ins. Deutsch. ii. p. 93; Rey, Col. Fr. Xantholin. p. 98. 
This is a genus of wide distribution, though comprising at present not more than 
twenty species, several of which are Oceanic and Australian, and two or three South- 
American. In Metoponcus the reduction in size of the prothoracic pleura becomes 
extreme, though at first sight the contrary appears to be the case, owing to the inflexed 
portion of the pronotum being very large, and to the fact that this latter part develops 
at the outside in front a more or less indistinct margin simulating the true margin, and 
occupying a similar position in the shape of the insect. 
§ 1. Capite subtus utrinque marginato et canaliculato. 
1. Metoponcus filarius. 
Leptacinus filarius, Er. Gen. et Spec. p. 334". 
Hab. Guatemata, San Gerdnimo, San Joaquin, Las Mercedes, Tamahu, Zapote 
(Champion); Nicaragua, Chontales (Janson), Granada (Sallé).—Souta AMERICA, 
Colombia 1, Amazons valley (Bates). 
2. Metoponcus guatemalensis. 
Minor, angustior, piceus, nitidus, sublevigatus; elytris pedibusque sordide testaceis, antennis rufis, 
Long. 43 millim. 
Hab. GuateMa.a, San Geronimo (Champion). 
This species is extremely closely allied to MZ. filarius, but is much smaller and narrower, 
with narrower and more elongate head and shorter and broader antenne. Possibly the 
pallid colour may not be a constant character, as only two examples have been found, 
and they differ slightly in this respect. 
3. Metoponcus cingulatus. 
Angustus, elongatus, nitidus, piceo-niger; pedibus flavis, antennis rufis; abdominis basi pallide testacea, apice 
piceo-testaceo. 
Long. 7 millim. 
Hab. Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion). 
