Staphylinidce of the Amazon Valley. 77 



AntennjB moderately long and not stout, yellowish, with 

 the four basal joints paler than the others; 3rd joint very 

 small; 4th minute; 5 — 10 very similar to one another, 

 each a little transverse. Head a good deal smaller than 

 the thorax, pitchy yellow, quite shining, almost impunc- 

 tate, the eyes rather large. Thorax a good deal narrower 

 than the elytra, but strongly transverse, the sides and base 

 distinctly rounded, the surface very sliining, and with the 

 discoidal punctures scarcely visible, the colour slightly 

 paler than that of the head. Elytra a little longer than 

 the thorax, very shining, almost similar in colour to the 

 head, the basal portion being a little paler than the apical ; 

 they bear a few elevated punctures, which are most dis- 

 tinct on the sutural portion of their area. Hind body 

 distinctly narrowed towards the extremity, obscm'e yel- 

 lowish, with the penultimate segments darker, almost 

 impunctate. Legs yellow. 



In the male the hind margin of the dorsal plate of the 

 7th segment of the hind body is produced in the middle, 

 so as to form an obtuse angle, and each outer angle 

 possesses a moderately long incurved spine, which projects 

 a little further backw^ards than does the central promi- 

 nence. 



Garrao; a single male found in fungus on the 11th of 

 November, 1874, by Dr. Trail. 



9. Gyrophcena tridens, n. sp. Nitidula, castaneo- 

 testacea, elytrorum lateribus abdomineque ante apicem 

 infoscatis ; antennarum basi, pedibusque testaceis ; pro- 

 thorace transverso, disco quadripunctato ; elytris parce 

 punctatis. Long. corp. | lin. 



Antennas only moderately stout, yellowish, with the 

 four basal joints paler; 3rd joint small, much smaller than 

 2nd; 4th minute; 5 — 10 differing little from one. another, 

 each a little shorter than long. Head dark yellowish, 

 rather small, almost impunctate. Thorax slightly narrower 

 than the elytra, strongly transverse, much rounded at the 

 base, and a little narrowed towards the front, shining, 

 similar in colour to the head, with four punctures on the 

 disc. Elytra a little longer than the thorax, infiiscate- 

 yellow, with the base paler, shining, sparingly and not 

 very distinctly punctured. Hind body almost impunctate, 

 yellowish, with the penultimate segments infuscate. Legs 

 yellow. 



In the male the hind margin of the dorsal plate of the 



