210 STAPHYLINID. 
was from Colombia. The figure accompanying the description does not indicate any 
unusual abbreviation of the terminal joint of the antennz; so that the genus rests on 
the facies of the species and the structure of the hind tarsi. In these respects the two 
species I here assign to the genus agree tolerably with Motschoulsky’s characters. 
They have the head carried on a distinct and narrow neck; and the two basal joints of 
the hind tarsi are subequal in length, the basal joint being, however, a little the longer, 
and the fourth joint being only slightly shorter than the basal one. The middle coxe 
are extremely widely separated ; and the mesosternum is very little produced between 
them, and presents a very broad quite truncate extremity; the metasternal process 
between the coxe is a good deal produced forward ; the very fine raised line that bounds 
it is obtusely acuminate in front, and is remarkable for its great distance from the 
cox; it does not attain, by a considerable interval, the mesosternum ; and there is thus 
left a very broad and by no means short intercoxal isthmus. 
This great separation of the middle coxa, in concomitance with the short basal joint 
to the hind tarsus, is sufficient to validate the genus, although different species of the 
polymorphic Myrmedonia approach it by various points. A second species of Orphnebius 
with remarkable male characters has been described by Solsky (Hor. Soc. Ent. Ross. x1. 
p- 8, t. 1. f. 2) from Peru. 
1. Orphnebius lativentris. (Tab. V. fig. 22.) 
Brevior, nitidula, testacea, levigata ; capite parvo; prothorace valde transverso, anterius subtruncato, poste- 
rius rotundato; elytris brevibus, sed quam prothorax longioribus et latioribus ; abdomine lato, levigato. 
Long. 33 millim. 
Hab. Guaremata, San Juan in Vera Paz, Zapote, Capetillo (Champion). 
Antenne rather short, at the base rather slender, a good deal thickened externally, 
yellow, but the colour of the middle joints more obscure, the penultimate joints strongly 
transverse, the fif:h and sixth slightly so, the terminal joint subcircular, not acuminate, 
not so long as the two preceding together. Head narrower than the thorax, eyes rather 
small. Thorax small, greatly narrower than the elytra, but twice as broad as long, the 
base much rounded, the hind angles completely absent. Elytra impunctate, but with a 
few fine short sete. Hind body broad, very polished and shining, lateral margins very 
largely developed. 
Four individuals of this species have been found; all are males. The seventh ventral 
plate has the hind margin provided with three rather large, broad, subequal teeth, 
one at each outside, and one in the middle; in front of the latter there is an obscure 
subtuberculiform elevation, and the outer margin of the plate bears an elongate 
raised line. 
The individual from Capetillo is a slight variety, having the antenne entirely 
yellow. | 
