StaphylinidcB of the Amazon Vallef/. 407 



following segments; on the underside the hind body is 

 pitchy red, paler towards the extremity, and all the 

 segments 2—6 are coarsely and rather closely punctured ; 

 on segments 3 and 4 and base of 5 the punctures are 

 almost wanting on a small space on the middle. Legs red. 



Ega ; four individuals, probably all females. 



(9^5. i.— Besides the specimens above described, I have 

 another individual from the same locality (Ega), which 

 I believe to be the male of P. rectus; it is rather smaller 

 than the individuals described, but the antemice are 2^ Im. 

 in length, the head is longitudinally depressed along the 

 middle, and the front part is scarcely shining, being 

 minutely strigose ; the 1 st joint of the antennfe is more 

 densely penicillate, and the 2nd and 3rd joints have also 

 a dense long pubescence on the inner face. 



Obs. IL~I believe the most closely allied described 

 species to be F. pennicornis and P. plagiatus, Fauv. I 

 have a fourth still undescribed species in my collection 

 from Rio, which is considerably larger, but has the head 

 similarly formed and, as well as the antennae, manifesting 

 similar sexual disparities. 



6. Piestus minutus, Er., Fauv. 



Para and Ega; four individuals. These individuals 

 indicate a peculiar race, which I have not seen from any 

 other locality ; they are small (about two lines m length), 

 and broad in proportion to _ their width; the elytra are 

 nearly black in mature individuals. 



7. Piestus pygmcEus, Lap., Er. 



Para and St. Paulo ; numerous specimens. ^ This is 

 another very puzzling species, owing to the variations it 

 exhibits, and it is quite possible that two or three closely- 

 allied species are mixed under this name. 



8. Piestus sulcatus, Grav. 



Para,Lages, Anana; five specimens, which agree exactly 

 inter se and only differ slightly from individuals from Bahia. 



9. Piestus rugosus, n. sp. Piceus, pedibus abdominisque 

 apice rufescentibus, opacus; prothorace dense _ rugoso, 

 lateribus pone medium obtuse dentatis; elytris Imeis 

 6 elevatis ; abdomine dense punctato. Long. corp. 2 ^ iin. 



