StaphylinidcB of the Amazon Valley. 67 



minent. Thorax about as long as broad, dilated in front, 

 with the anterior angles rounded ; again just a little 

 broader at the posterior angles, which are deflexed and 

 obtuse ; yellowish, shining and impunctate. Elytra much 

 broader and a little longer than the thorax, also a 

 little darker in colour. Hind body smooth, shining and 

 impunctate, its sides gently rounded, scarcely any nar- 

 rower at the base than at the 6tli segment. Legs yellow, 

 elongate and slender ; posterior tarsi with the three basal 

 joints elongate, each a little shorter than the preceding 

 one ; middle coxjb widely separated, mesostemum very 

 little produced between them, and separated from the pro- 

 duced point of the metasternum by a broad space. 

 Tapajos ; one individual. 



2. Tachyusa extranea, n. sp. Rufo-testacea, capite, 

 elytris abdominisque segmento sexto obscurioribus ; sub- 

 tilissime punctulata, thorace subquadrato, obsolete canali- 

 culato, elytris hujus longitudinis. Long. corp. 1 j lin. 



This species has much the form of a Homalota. The 

 antennas are yellowish, elongate and rather stout, slightly 

 thickened towards the apex ; 3rd joint a little longer than 

 the 2nd ; 4th shorter than the 2nd; 5 — 10 differing but 

 little in length, 10th about as long as broad; 11th joint 

 long, rather pointed, more than tAvice as long as the 10th. 

 Head brownish-yellow, slightly narrower than the thorax, 

 short, smooth, shining and impunctate. Thorax yellowish, 

 with the sides in front dilated, rounded and much de- 

 flexed ; it is about as long as broad, indistinctly chan- 

 nelled, almost imperceptibly punctured. The elytra are 

 broader than the thorax, about as long, a little darker in 

 colour, and Avith their punctuation not quite so obsolete. 

 The hind body is but little narrowed at the base ; it is 

 yellowish, with the 6th segment a little darker; it is 

 smooth, shining and impunctate. The legs are yellowish ; 

 the posterior tarsi slender and moderately long. 



Tapajos ; two individuals, miich mutilated. 



Obs. — This species appears to be nearly allied to 

 T. pictirornis, at any rate in so far as the structure of 

 the sternum is concerned ; its tarsi I have been unable 

 to examine. Its smaller size and unicolorous aiitennai 

 render it easily distinguishable from T. picticornis. 



F 2 



