Staph// linidcE of the Amazon Valley. 197 



linus and XanthoUnns : the three species I have placed 

 in it Avill probably be ultimately separated generically ; 

 indeed the L. tenuipcs and extremus a])pear to be con- 

 generic with Thijreocephalii.s Jckeli, Guer. ; but as Gue- 

 rin's genus is not accepted at present, and as the Linidius 

 recticollis does not agree therewith, I have associated all 

 the three species under the name Linidius, leaving the 

 iHiion of L. tenuipcs and X. extremus with T. Jchcli, 

 until the genus Fhyreocephalus is again rehabilitated. 

 The limits of the genera of Xantholinini are, in fact, at 

 present about as uncertain as possible. 



1. Linidius recticollis, n. sp. Niger, nitidus, elytris 

 cyaneis, fortiter punctatis, capite fortiter minus crebre 

 punctato, prothorace lateribus parallelis. Long. corp. 6 lin. 



Antennaj black, the Ijasal joint very slightly curved ; 

 2nd joint short, 3rd considerably longer than 2nd ; joints 

 4 — 10 differing but little from one another in width or 

 length, transverse ; 1 Ith joint short. Palpi pitchy yellow, 

 last joint of the labial a little thickened on the inside. 

 Mandibles short and stout, black. Head about as broad 

 as the thorax, longer than broad, slightly narrowed in 

 front, shining black, coarsely and sparingly punctured, the 

 punctiu'es wanting on the front part; beneath also sparingly 

 and coarsely pimctured, the punctures wanting in the 

 middle. Thorax narrower than the elytra, straight at the 

 sides, nearly twice as long as broad, shining black, and only 

 punctured at the sides and front angles. Scutellum with 

 four or five coarse punctures. Elytra scarcely so long as 

 the thorax, dark shining blue, coarsely and moderately 

 closely punctured. Hind body shining black, sparingly pu- 

 bescent, rather narrowed towards the extremity, sparingly 

 and rather coarsely punctured. Legs pitchy black. 



Ega ; one specimen. 



2. L.inidius tenuipes, n. sp. Niger, nitidus, elytris 

 cyaneis, fortiter punctatis, ano ferrugineo, capite lateribus 

 et vertice punctatis, utrinque pone oculos punctis duobus 

 majoribus. Long. corp. 7 lin. 



Antennte but little longer than the head, not thickened 

 after the 4th joint ; 3rd joint much longer than 2nd ; 4 — 10 

 transverse, differing very little from one another; last joint 

 rather small, obtusely pointed. Palpi dusky yellow. INIan- 

 dibles moderatelv Ion"-, shinine; black. Head broad, rathei* 

 broader than the thorax, about as broad as the elytra. 



