StaphijlinidcB of the Amazon Valley. 187 



the three basal joints bkie, the rest obscure. Palpi stout. 

 Mandibles about two-thirds of the length of the head. 

 Head quite as broad as the greatest Avidth of the thorax, 

 its width about as great as from the front of the eyes to 

 the back of the head ; the whole of the upper surface 

 densely, evenly and coarsely rugose-punctate, beneath 

 very shining, the punctures there about tAventy-four on 

 each side ; those at the back angles small, the others very 

 large, the middle part quite free. Thorax considerably 

 longer than broad, a little narrowed from the base to the 

 middle, more narrowed from the middle to the front ; a 

 deep oblique impression on each side, near the back ; the 

 sides in front of the impression rather sparingly punctured, 

 a broad middle line impunctate. Elytra longer than the 

 thorax, finely and sparingly punctured. Hind body A'ery 

 shining, very finely and very sparingly punctured. Legs 

 violet. Hind body beneath less sparingly and finely 

 punctured than above. 



Ega ; six individuals. 



Ohs. — These specimens vary somew'hat in their colour, 

 which is sometimes purple, sometimes of a bluer or greener 

 tint ; the punctures also on the underside of the head are 

 more numerous and distinct in some individuals than in 

 others. Two specimens have the 7th segment beneath 

 a little depressed in front of the hind margin, and more 

 finely punctured and pubescent, the hind margin itself 

 being very slightly emarginate ; I think they are pro- 

 bably males. 



2. Sterculia ■pauloensiis, n. sp. Cyanea, nitida, thorace 

 elytris breviore, capite oblongo, subtus basin versus parcius 

 punctate, mandibulis capite brevioribus. Long. corp. 

 12 lin.: lat. elytrorum apice 2| lin. ; prothoracis basi 

 Iflin. 



Very closely allied to the preceding species, but larger, 

 and Avith the mandibles a little longer, the head and tho- 

 rax broader, the head being distinctly broader than the 

 thorax, Avhile the thorax is less slender in front; the 

 punctin-es on the under side of the head are only elcA^en 

 in number, smaller punctures near the hind angles being 

 quite absent. 



St. Paulo ; a single individual. 



Ohs. — It is quite possible this may not proA^e to be a 

 distinct species from the IS. amazonica, Avhich, as I have 

 above noticed, appears to be somewhat variable. 



