Staphi/Unid(B of the Amazon Valley. 357 



rence of this form in South America as well as in Japan 

 renders it highly probable that other links will be found 

 between these two dissimilar genera. I may indeed here 

 express my opinion that the interesting genus Ctenomastax , 

 recently described by Kraatz, from Spain, should be placed 

 next Euasthetus, and not among the Pcederidm; indeed, 

 the descriptions and figures of Kraatz and Fauvel appear 

 to point out as generic distinction from Euasthetus only 

 a slight difference in the insertion of the antenna?. 



1. StencBsthetus Hiatus, n. sp. Castaneo-testaceus, fere 

 glaber, subnitidus, capite, thorace, elytrisque crebre sat 

 fortiter punctatis, abdomine subtilissime punctidato ; tho- 

 race subcordato, elj-tris hujus longitudine. . Long. corp. 

 H lin. 



Antennse very slender, but with the basal joint stout, it 

 being quite four times as broad, though scarcely so long 

 as, the 2nd; joints 2 — 8 excessively slender, differing 

 little from one another in length, 9 and 10 very slender, 

 but distinctly broader than the preceding ones, 10th rather 

 longer than 9th. Head short and broad, with the eyes 

 rather broader than the thorax ; near the fi-ont Avith two 

 distant fovea?; moderately closely punctured; the punc- 

 tures, when seen under a high power, are umbilicated, as 

 in Sunius, but the interstices are broad, and covered Avith 

 a very fine, intricate reticulation, which renders the surface 

 nearly opaque ; the eyes very convex, moderately large, 

 coarsely facetted, reaching the broad vertex. Thorax a 

 good deal narrower than the elytra, rather longer than 

 broad ; the sides a little rounded in front of the middle, 

 narrowed behind the rounded part ; the hind angles nearly 

 right angles, not rounded; the surface rather coarsely 

 sculptured, with sculpture similar to that of the head, 

 but the punctures deeper and the interstices narrower ; 

 along the middle of the basal part are traces of two longi- 

 tudinal impressions. Elytra about as long as and rather 

 more coarsely punctured than the thorax. Hind body 

 robust, but with the apical segments very narrow, exces- 

 sively finely and indistinctly punctured, not shining. Legs 

 slender, pale yellow. 



In the male, on the underside, the 4th and 5th seg- 

 ments of the hind body are plicate in the middle, and the 

 elevated part is slightly produced ; the 6th has the hind 

 margin slightly emarginate. 



