460. STAPHYLINIDA. 
emarginate, but with a small smooth angular space in front of it; the female is 
unknown. 
The only example found is possibly immature, and its colour when mature might be 
nearly all black. Though very closely allied to A. arduus it is distinguished by 
numerous slight peculiarities. 
7. Actobius mixtus. 
fordide rufus; capite elytrisque nigricantibus, horum apice, antennarum basi pedibusque testaceis ; pectore 
abdominisque apice fuscis ; thorace crebre fortiter, elytris parcius, punctatis, his nitidulis. 
Long. 4 millim. 
Hab. Mexico, Cordova, Vera Cruz, Tehuacan (Hoge); GuateMaLa, San Gerdénimo 
(Champion). | 
Antenne fuscous yellow, with the three basal joints clear yellow; moderately long, not 
stout, the penultimate joint not quite so long as broad. Head rather coarsely punctate, 
with a rather broad space along the middle impunctate. Thorax slender, slightly 
narrowed behind, very shining, infuscate red, somewhat sparingly and coarsely punctate, 
with a rather broad space along the middle smooth. Elytra shining, dilute black, with 
the hind margin rather broadly pale, and the sutural region frequently obscurely paler, 
sparingly and rather finely punctate. Hind body sordid red, with the two terminal 
segments more or less infuscate. 
The male has a small notch on the last ventral plate, and its front tarsi rather 
strongly dilated. 
Only four examples have been received from Mexico, but Mr. Champion secured 
eighteen specimens at San Gerénimo. 
8. Actobius nitidulus. (Tab. XII. fig. 6.) 
Angustus, niger, parce pubescens et punctatus; elytris margine posteriore pedibusque pallide testaceis, antennis 
sordide testaceis. 
Long. 4 millim. 
Hab. GUATEMALA, near the city, San Gerdnimo (Champion). 
Antenne dark yellow, the penultimate joint not quite so long as broad. Head 
sparingly punctured, with a broad space on the middle smooth. Thorax narrow, a 
good deal narrower than the elytra, evidently narrowed behind, with two widely 
separated series of punctures along the middle, and with a few lateral punctures. 
Hind body slightly broader from the base till beyond the middle, the basal segments 
each very deeply transversely depressed at the base, each segment with the hind margin 
more or less definitely pallid. 
This species is a very distinct one, the sparing punctuation and the less parallel form 
distinguishing it satisfactorily from its congeners in our fauna. The punctuation on 
the wing-cases is almost confined to the basal part, becoming so very scanty and obsolete 
