648 STAPHYLINIDA. 
18. Stenus buccalis. 
Nigro-zneus, parum nitidus, dense fortiterque punctatus; palpis flavis, antennis pedibusque testaceis, illis basi 
et apice fuscescentibus ; labro anterius in medio angulato prominulo ; capite fortius carinato ; prothorace 
in medio ampliato. 
Long. 43 millim. 
Hab. Nicaragua, Managua (Sai/é). 
Head very broad, rather broader than the elytra, densely punctate, excavate, with a 
very conspicuous, rather broad, strongly elevated carina along the middle of the exca- 
vation. Thorax rather longer than broad, much rounded at the sides, its greatest width 
in front of the middle; very densely and coarsely punctate, but not rugose. Elytra 
scarcely longer than the thorax, densely punctate. Basal segments of the hind body 
very coarsely, the apica] one very obsoletely, punctate. Male with a small, very narrow 
angular excision of the last ventral plate, the following segment depressed and 
pubescent along the middle for a great part of the length. Unique. 
This and the following species cannot fail to be recognized, on account of the 
peculiar condition of the labrum. 
19. Stenus nasutus. (Tab. XVII. fig. 7.) 
Niger, vix subsneus, nitidus, fortiter punctatus; palpis pedibusque testaceis, antennis fuscis; labro in medio 
porrecto, acuminato ; vertice medio argute et alte elevato, polito. 
Long. 44-5 millim. 
Hab. Panama, San Miguel in the Pearl Islands (Champion). 
This is a very curious species, readily identified by the angularly prominent labrum ; 
the head is very broad, coarsely punctate, with a polished strongly raised longitudinal 
elevation extending all along the middle. Thorax short and broad, subglobose, very 
coarsely and closely punctured, shining. Hind body sparingly pubescent; the basal 
segment coarsely punctate, the apical one nearly impunctate. Legs long and slender. 
Male with a rather slender excision of the last ventral plate, the preceding segment a 
little deplanate and near the hind margin densely pubescent. Two examples. 
II. Zarsi articulo quarto bilobo. 
A. Abdomen marginatum. 
20. Stenus scabrosus. 
Niger ; antennis, palpis pedibusque testaceis ; prothorace elytrisque dense fortiterque rugoso-punctatis; abdo- 
mine basi parce punctato, apice fere impunctato. 
Long. 7 millim. 
Hab. Mexico, Cordova (Sallé); Guarmmata, El Tumbador, Las Mercedes, Cerro 
Zunil, Balheu, San Juan in Vera Paz, Sabo (Champion). 
Antenne and palpi very elongate, yellow, the club of the former only slightly darker. 
