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COSSONUS. 



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smooth, the eyes not prominent ; rostrum short, feebly, transversely, subquadrangularly dilated at the 

 apex, finely, somewhat closely punctate ; antennal club large. Prothorax about as long as broad, oblong- 

 subquadrate, feebly constricted and arcuately narrowed in front, and also narrowed at the base, the 

 latter deeply bisinuate ; the disc with an elongate-triangular, irregularly biseriato-foveate, carinate 

 depression extending from the base to near the apex (the smooth median line limited on each side 

 posteriorly by a deep, triangular, rugose area), the depression limited externally by a polished, almost 

 impunctate space, the outer margins and flanks coarsely, closely punctate. Scutellum small. Elytra 



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elongate, scarcely wider than the prothorax, subparallel ; punctate-striate, the punctures becoming rather 

 coarse and crenate towards the base and fine towards the apex, the interstices broader than the striae, 



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flat, slightly raised anteriorly. Tibiae broad. 



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Length 4, breadth T \ millim. 



Hob. Panama, Volcan de Chiriqui 4000 feet (Champion). 



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One specimen. A lon^, narrow, cylindrical form, with an elongate- triangular, 



biseriato-foveate, carinate excavation on the prothorax, limited externally by an 



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ill-defined polished space, and the punctured strise of the elytra becoming very much 



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finer towards the apex. C. evanescens approaches C. ligniperdus, but the latter is less 





convex and has the elytra more coarsely punctate-striate throughout. 





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51. Cossonus nitidicollis, sp. n. (Tab. III. figg. 21, 21 a.) 



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Elongate, narrow, flattened on the disc, very shining, black or nigro-piceous, the base of the antennae, the tarsi, 



and sometimes the tibiae also, ferruginous. Head foveate and transversely grooved between the somewhat 

 convex eyes, the globose basal portion aud the interocular space almost smooth: rostrum rather convex, 







curved, quadrangularly dilated at the apex, the narrow basal portion a little longer than the apical, and 

 almost smooth. Prothorax about as long as broad, subquadrate, narrowed and very feebly constricted in 

 front, moderately bisinuate at the base ; the disc with a very deep, sharply-defined, rugosely punctate, 

 shortly carinate area at the base, and an abbreviated single or double row of coarse punctures between 

 it and the apex, the rest of the dorsal surface polished and almost impunctate, the flanks coarsely 









punctured. Scutellum small. Elytra moderately long, subparallel, a little wider than the prothorax ; 



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seriate-punctate, the punctures becoming coarser and arranged in sinuous lines towards the base and 



fine towards the apex, the interstices smooth, flat, broad on the disc, narrow at the sides. 

 Length 3-3f, breadth i-l T V millim. 



Hab. Mexico (Mus. Brit.), Jalapa {Hbge) ; Guatemala, San Geronimo (Champion) ; 

 Costa Rica, Cache (Rogers), La Uruca 1100 metres (Biolley). 



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Eight examples, one of which has done duty for C. foveatus for many years in the 

 British Museum. A small, narrow, somewhat depressed form related to C. foveatus, 







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with the entire disc of the prothorax (the very deep triangular basal fovea and a few 

 coarse punctures preceding it excepted) polished, the elytra with rows of scattered 



s and flat interstices. An allied undescribed species (C. scr obicollis , Chevr., 

 , Jekel) occurs at Caracas. A Costa-Rican specimen is figured. 



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52. Cossonus "bigeminatus, sp. n. (Tab. III. figg. 22, 22 a.) 



excepted), and sometimes a space down the middle of the prothorax, rufo-castaneous, the base of the 

 antennae, and in one specimen the legs also, ferruginous. Head foveate and sparsely punctate between 



oderately elongate, depressed, shining, black or piceous, the elytra (the suture, or the suture, sides, and apex, 





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the rather prominent eyes, the globose basal portion almost smooth ; rostrum short, curved, convex, 

 abruptly subquadrangularly dilated at the apex, sparsely finely punctate. Prothorax transversely sub- 



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