712 STAPHYLINIDA. 
2. Zirophorus bicornis. 
Oxytelus bicornis, Oliv. Encycl. Méth. viti. 2, p. 615°. 
Zirophorus fronticornis, Dalm. Act. Holm. 1821, p. 373; Anal. ent. p. 24, t. 4. f. 1 (1828). 
Piestus bicornis, Lap. Etud. ent. i. p. 128°; Er. Gen. et Spec. Staph. p. 831°. 
Hab. Nicaragua, Chontales (Belt, Janson), Granada (Sallé); Panama, Bugaba, Volcan 
de Chiriqui 2500 to 4000 feet (Champion).—Souts America’ 4, Colombia 1. 
Var. oxytelinus. 
Piestus oxytelinus, Lap. Etud. ent. i. p. 128°. 
Hab. Nicaragua, Chontales (Belt, Janson),—VENEZUELA}. 
3. Zirophorus furcatus. (Tab. XIX. fig. 4.) 
Rufo-piceus, nitidus; capite cornubus duobus subdistantibus armato, mandibulis furcatis; elytris quinque- 
striatis. 
Long. 7 millim. 
Hab. Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion). 
Antennz moderately long, very sparingly setose; the fourth and one or two of the 
following joints a little incrassate. Mandibles elongate, divided in the middle; the 
upper branch elongate and slender, the lower branch thicker and also elongate and 
placed nearly at right angles to the upper. Thorax transversely subquadrate, canalicu- 
late, impunctate. Elytra each with five impunctate stric, and an extremely abbreviated 
sixth external stria. Hind body coarsely punctate, with a large smooth space on the 
middle of the posterior part of each segment. 
This insect is only half the size of Z. dicornis, and is also quite distinct from that 
species by the structure of the mandibles; it is nearer to Z. lacordatrei, but the latter 
is black, has the frontal horns more distinct, and the space between them more depressed, 
the upper branch of the mandible less elongate, and the hind body more punctate. 
A series of eight examples was procured. 
PIESTUS. 
Piestus, Gravenhorst, Mon. Col. Micr. p. 223 (1806). 
Piestus (pars), Erichson, Gen. et Spec. Staph. p. 830 (1840); Fauvel, Bull. Soc. Linn. Normand. 
ix. p. 22 (1865). 
This genus is peculiar to the tropical regions of the New World; it contains, after 
the abstraction of the insects I refer to Zirophorus, about fifteen described species. 
1. Piestus niger. 
Piestus niger, Fauv. Bull. Soc. Linn. Normand. ix. p. 28, t.1. £.77; Notices ent. ii. p. 24, t.1. £77. 
Hab. Muxico (Flohr), Cordova (Sallé12), Jalapa, Tehuacan (Hége); GuatEmAua, near 
the city, Zapote (Champion); Panama, Volcan de Chiriqui below 4000 feet (Champion). 
