682 STAPHYLINIDA. 
Head shining, rather closely punctate. Thorax as long as broad, a little narrowed 
behind, the hind angles not very obtuse; with but few, only moderately coarse 
punctures ; the median smooth space broad, definite, and parallel. Elytra rather longer 
than the thorax, sparingly punctate. 
We have received eight examples of this species. The comparatively large develop- 
ment of the mandibular tooth—that on the right mandible being particularly large and 
prominent—distinguishes O. debilis satisfactorily from its allies, independent of the 
minor characters. 
14, Osorius salvini. 
Angustus, cylindricus, piceus ; elytris rufis, antennis pedibusque testaceis; capite prothoraceque fortiter punctatis ; 
mandibulis brevibus argute dentatis. 
Long. 4 millim. 
Hab. Guatemaua, near the city 5000 feet (Salvin), San Gerénimo (Champion). 
Head shining, its sculpture subtuberculate and moderately close. Thorax strongly 
narrowed behind, very coarsely punctured, with a very definite space along the middle 
impunctate. Elytra rather obsoletely punctured. 
In this species the short sete on the surface are more distinct than in the allied 
forms ; the hind body is densely punctured, and its sete very evident. Mr. Champion 
met with a good many specimens, but they are mostly in a very bad state of preserva- 
tion; the colour is variable, perhaps as the result of decay. The North-American 
O. latipes is closely allied to this insect, but is twice the size, and has more densely 
punctured elytra. 
15. Osorius micros. 
Angustior, cylindricus, piceus vel rufescens; antennis pedibusque testaceis; capite prothoraceque fortiter 
punctatis. 
Long. 33 millim. 
Hab. GuateMaLa, Pantaleon (Champion); Honpuras (Sallé); Panama, San Feliz 
(Champion). 
This is the smallest, narrowest, and most parallel of all the Osoriz. It has the thorax 
but little narrowed behind, and its lateral margins excessively fine; in other respects 
similar to O. salvini. 
We have received only four examples of this species; the one from Honduras was 
labelled “ O. micros, Fauvel” in Sallé’s collection. 
HOLOTROCHUS. 
Holotrochus, Erichson, Gen. et Spec. Staph. p. 757 (1840) ; Leconte, Tr. Am. Ent. Soc. vi. p- 216. 
This genus has a considerable number (twenty or so mostly undescribed) of species 
in South America, two in the Antilles, and one each in Java and Madagascar. They 
appear to be rare insects and solitary in their habits. According to Mr. Champion 
they are usually found beneath wet sappy bark. 
