Staphylinidcz of the Amazon Vallejj. 213 



three-fourths the width of the elytra, longer than broad, 

 nearly straight at the sides, closely punctured, the back 

 part more coarsely than the front part, Avith a line down 

 the middle impunctate. Elytra one-third longer than the 

 thorax, quite dull, densely and finely punctured. Hind 

 body opaque, finely and obscurely punctured, the margins 

 of the segments rufescent ; the setee numerous and distinct. 

 Legs reddish-yellow. 



The male is only distinguished from the female by a 

 very small notch at the extremity of the 7 th segment 

 beneath. 



Tapajos; numerous specimens, (? and $. Besides these, 

 I have also an imperfect female from Ega, agreeing very 

 closely Avith C. opacum, except that the head is rather 

 longer and narrower (as in the C. opacifrons), and the legs 

 longer. It is only by the examination of a male individual 

 that I could decide Avhether it belongs to a distinct species 

 or not. 



4. Crt/ptobium opacifrons, n. sp. Nigro-fuscum, 

 opacum, antennis pedibusque rufo-testaceis ; capite omnium 

 dense subtilissimeque rugoso-punctato ; prothorace dense 

 punctato, linea media impunctata ; elytris dense minus 

 subtiliter rugoso-punctatis. Long. corp. 4g lin. 



Mas : abdomine segmento 7° ventrali medio longitu- 

 dinaliter impresso, apice late minus profunde exciso. 



At first sight exactly similar to the C. opacum, but 

 differing therefrom by its more coarsely punctured elytra, 

 by the different male characters, and also by its head 

 being a little longer and narrower. Antennte nearly as 

 long as head and thorax, yellowish ; 3rd joint one and 

 a half times as long as second, 4 — 9 differing little from 

 one another; 10th and 11th joints markedly shorter. 

 Palpi yellowish. Head elongate, quite as broad as the 

 thorax, the front part much produced, the eyes placed 

 about the middle ; it is extremely dull, being very finely 

 and densely rugose-punctate. The thorax is about three- 

 fourths of the width of the elytra ; it is longer than broad, 

 nearly straight at the sides, with a line along the middle 

 smooth and shining, on each side of this coarsely and 

 closely punctured ; the punctuation at the sides towards 

 the front part much finer than the rest. The elytra are 

 longer than the thorax, dull, but densely and not alto- 

 gether finely rugose-punctate. The hind body is finely 



