458 STAPHYLINIDZA. 
The male front tarsi are moderately dilated, and there is a small narrow notch on the 
last ventral plate. | 
This species is readily distinguished by its stature and broad form; the middle cox 
are more widely separated than in other species. Only two examples have been found. 
2. Actobius facilis. 
Major, niger, nitidulus; pedibus fuscis, femoribus pallide testaceis; capite thoraceque crebrius fortiter, elytris 
subtilius, punctatis. 
Long. 63 millim. 
Hab. Guatemata, San Gerénimo (Champion). 
Antenne slender, with the basal joints more than usually elongate, the penultimate 
joint quite as long as broad. Head rather elongate, a little narrowed behind, closely 
and rather coarsely punctate. Thorax intense black, extremely shining, its punctuation 
coarse and close. Elytra shining, sparingly and rather finely punctate. 
The male front tarsi are moderately dilated, and there is a small but distinct notch 
on the last ventral plate, the quite small space in front of the notch being smooth and 
shining. 
This is another rather distinct species, with hind tarsi longer than usual. Only one 
example has been found. 
3. Actobius concolor. 
Niger, nitidulus ; pedibus fuscis, femoribus fusco-testaceis ; capite thoraceque crebrius fortiter, elytris crebrius 
subtiliter, punctatis. 
Long. 67 millim. 
Hab. Panama, Volcan de Chiriqui 4000 to 6000 feet, Pefia Blanca 3000 to 4000 feet 
(Champion). 
Antenne rather stout, the penultimate joint scarcely so long as broad. Head rather 
broad, rather closely and deeply punctate. Thorax quite straight at the sides, punctate 
like the head, the medial smooth space definite and distinct. Elytra shining, their 
punctuation differing little at the base and apex, not dense. 
The male front tarsi are moderately dilated, and there is a small notch on the last 
ventral plate. 
A series of a dozen examples was found on the Volcan de Chiriqui, and a single 
example at Pefia Blanca. 
4, Actobius arduus. 
Angustulus, parallelus, niger ; pedibus pallide testaceis ; antennis fuscis, basi sordide testaceis ; capite thoraceque 
crebrius fortiter punctatis; elytris quam prothorax longioribus, minus dense subtilius punctatis, margine 
posteriore vage pallidescente. 
Long. 5 millim. 
Hab. Mexico, Guanajuato, Cordova, Puebla (Sallé), Mirador, Tehuacan, Jalapa 
