742 STAPHYLINIDZ. 
§ 2. Frontal area deeply depressed. 
5. Priochirus divergens. (Tab. XIX. fig. 23.) 
Minus depressus, niger, nitidus; antennis pedibusque piceis; vertice cornibus duobus divergentibus, apicibus 
acuminatis, cornu margine interno subtus longius dentato, inter cornua area magis depressa, margine ante- 
riore rotundato. 
Long. 11-13 millim. 
Had. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 
Though very similar to P. larus, this species is readily distinguished by the armature 
of the head, the horns being longer and acuminate at the tip; the space between the 
horns more depressed, with its front margin rounded instead of emarginate. 
Four examples. 
6. Priochirus collaris. 
Minus depressus, niger, nitidus; pedibus piceis, abdominis apice rufescente ; vertice cornibus duobus sub- 
parallelis, apicibus leviter emarginatis, cornu margine interno subtus longius dentato, inter cornua area 
magis depressa, margine anteriore in medio vix producto, seta munito; prothorace ad latera numerose 
setigero. 
Long. 11 millim. 
Hab. GuateMata, Purula 4000 feet (Champion). 
This species has the space between the horns short and with a nearly straight ante- 
rior margin, the latter bearing a single long seta in the middle; these characters and 
the greater depression of the space below the level of the vertex distinguish the 
species from P. laxus, to which it is otherwise extremely similar. P. collaris has 
apparently another character, in the setigerous punctures at the side of the thorax 
being more numerous than usual. Unique. 
7, Priochirus laticornis. 
Convexus, niger, nitidus; pedibus piceis, abdominis apice rufo; vertice cornibus duobus latis, parallelis, 
apicibus truncato-emarginatis, inter cornua area profunde depressa, plana, margine anteriore truncato. 
Long. 13 millim. 
Hab. Mexico, Cordova (Sal/é). 
This apparently is the largest and least depressed of our species; it will be recog- 
nizable by its very broad, flat cephalic horns, which are broadly emarginate at the apex 
and have their inner margin slightly sinuate beneath; the lobes of the vertex much 
swollen, and their hind angles rectangular and sharply defined; and the prothoracic 
channel very deeply foveolate behind. Unique. 
8. Priochirus salvini. 
Minor, sat depressus, nitidus, niger; antennis pedibusque piceis, abdominis apice rufo; vertice cornibus 
