StophyllnidcB of the Amazon Valley. 131 



a little narrower than the thorax; the antenna3 are dusky 

 yellow, and are rather shorter, joint 4 being about as long as 

 broad, joints 5 — 10 transverse; all the legs are black. 

 The 6th segment of the hind body slightly darker at the 

 extreme base ; the head and thorax rather more finely 

 punctured. 



St. Paulo ; one specimen, ? . 



Ohs. — A second female individual, labelled only Ama- 

 zons, departs still more from X. depressus, its head and 

 thorax being still more finely and sparingly punctured ; 

 but I believe it to bo only a variety of A', it i gripes. 



8. Staphjjlinus xantliopygus, Nord. 



I refer to this name a series of individuals, from Ega 

 and Pebas ; they appear to me to be quite conspccific with 

 other specimens from Mexico and central America, and I 

 have two or three other closely allied species from other 

 parts of South America. The characters of the male are 

 not described either by Xordmann or Erichson ; in that 

 sex the hind margin of the ventral plate of the 7th seg- 

 ment of the hind body has a broad but shallow notch in 

 the middle, and the front tarsi are slightly more dilated 

 than in the female. Erichson names the species Philon- 

 thus xanthopygus, but his description does not accord very 

 satisfactorily with Nordmann's, and I judge it to have been 

 drawn up from more than one species. In the Munich 

 CatalogU' ,, Nordmann's species is recorded under the name 

 Xanthopygus ohdominalis, and it is probable that the 

 ajjpellation of the species will be again changed. 



9. Xanthopygus cognatus, n. sp. Subdepressus, niger, 

 nitidus, abdomine segmentis duobus ultimis rufo-testaceis. 

 Long. corp. 6 lin. 



Closely allied to Staphylinus xanthopyqns, Nord. 

 {Philonihus xanthopygus, Er.), but not half the size 

 of that species. Antennae rather short and stout, not 

 thickened toAvards the extremity ; the first 3 joints black, 

 the rest fuscous ; 3rd joint almost shorter than 2nd, 4th 

 and 5th slightly transverse, 6 — 10 evidently so; last joint 

 sinuate at the extremity and pointed. Head short, about 

 as broad as the thorax, coarsely and irregularly punctured, 

 the middle parts without punctures. Thorax about as 

 long as broad, the sides scarcely sinuate behind and very 

 little rounded towai'ds the front. Along the middle are 



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