StaphijliaidcB of tlie Amazon Vallci/. 129 



thorax. Antenna3 and palpi entirely yellow. Head ratlier 

 smaller than the thorax, with the disc broadly impunctate, 

 the pvinctures rather coarse and moderately numerous. 

 Thorax about as long as broad, nearly straight at the 

 sides, the ])unctures numerous and rather coarse, the 

 middle smooth space rather narrow. Scutellum rather 

 coarsely punctured. Elytra blue, broader and rather 

 longer than the thorax. Hind body densely and rather 

 coarsely ]iunctured, the hinder half of the 6th segment as 

 well as all the 7tli reddish -yellow. Legs black, front tarsi 

 ferruginous. 



The male has on the underside a transverse line of long 

 erect hairs in the middle of the 6th segment, the hind 

 margin of the same segment slightly emarginate ; in the 

 middle of the hind margin of the 7th segment is a rather 

 deep, abruptly cut-out notch. 



Conceicao, l\io Mauhes, May, 1874, one male ; 

 Tunantins, 24th November, 1874, one female, found by 

 Dr. Trail ; also one specimen of each sex brought from 

 Ega by Mr. Bates. 



Obs. T. — The female of this species has the antennre a 

 little shorter and their penultimate joints more transverse 

 than the $ . 



Obs. II. — Though this species is closely allied to A". 

 sffj)j)/drijiiis, there can be no doubt it is quite distinct 

 therefrom. It is Avorthy of remark that not only do the 

 external abdominal characters of the S greatly resemble 

 those o{ X. sappliirmus, but that also the structure of the 

 asdeagus in the two species is very similar, the ligula 

 beino- in both more detached from the bodv of the organ 

 than in the other species here described. The front tarsi 

 are, on the other hand, sufficiently dissimilar in this sex 

 of the tAvo species to afford of themselves satisfactory 

 characters by which the two may be distinguished ; they 

 are not so broad and patellated in A', violaceiis, and are 

 less densely pubescent beneath. 



6. Xanthop7/fjus depressus,r\. ^]). Subdepressus, niger, 

 nitidus, elytris vel viridibus vel cyaneis, abdominis seg- 

 nientis ultimis duobus flavis, an tennis pedibusque ex parte 

 rufo-testaceis. Long. corp. 5 lin. 



Mas : abdominis segmento 1" ventrali margine apicali 

 medio, late hand jirofunde triangularitcr cmarginato. 



Antenna} dull yellow at the base, infuscated in the 



TRANS. ENT. SOC. 1876. — PAKT I. (mAY.) K 



