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COSSONUS. 



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Canal Zone (Busck, in U.S. Nat. Mies.). — Colombia (coll. Janson) ; Ecuador; Brazil ; 

 Antilles, St. Vincent (H. H. Smith). 



A rather small, moderately elongate, depressed form, with the rostrum broad, very 



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short, apically dilated, finely punctate; the eyes somewhat prominent; the head 



exserted, with the basal portion continuous with the front and constricted at the sides 



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only at some little distance behind the eyes, sometimes feebly foveate between 

 them; the prothorax broader than long, bisinuate at the base, abruptly constricted 



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anteriorly, triangularly, longitudinally depressed on the disc, the depression large and 



with an oblique irregular double series of coarse punctures on each side extending 



ards to the transverse, sinuous, subapical groove and there confluent (the inter- 



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venins space sometimes with a few additional impressions), the rest of the surface to 



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near the outer margin very sparsely minutely punctured ; the scutellum rather large, 



; the elytra flat on the disc, coarsely crenate-striate. A variety occurs at Chimbo, 



Ecuador, with the disc of each elytron rufescent. The length varies from 3^-4f- mm. 



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. Cossonus marcidus, sp. n. (Tab. III. fig. 25.) 



Moderately elongate, depressed, shining, black or piceous (immature). Head exserted, feebly constricted at 



the sides behind the rather prominent eyes, the front continuous with the vertex, closely punctate, 



trace of fovea ; rostrum very short, about as broad as long, transversely dilated at the apex, 



closely punctate. Prothorax a little broader than long, rounded- subquadrate, constricted and much 



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narrowed in front, feebly bisinuate at the base ; the disc broadly, subtriangularly flattened or depressed 







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from the transverse, sinuous subapical groove to the base, the flattened space (except along the smooth 

 median line) closely, coarsely, irregularly punctate, the rest of the surface exterior to it very finely and 

 sparsely punctured, the punctuation becoming coarser and closer again along the outer margin and 

 flanks. Scutellum rather large, flat, smooth. Elytra moderately long, slightly wider than the pro- 

 thorax, subparallel, flattened ; punctate-striate, the interstices flat, those on the disc broader than the 

 striae, minutely unisenate-punctate. 



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Length 3-34, breadth l-U millim. 



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Hob. Panama, Volcan de Chiriqui 3000 feet (Chamjnon). 



specimens. This is a form of C. thoracicus with the larger punctures on the 



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ened central portion of the prothorax reduced in size, confusedly arranged, and 





dvjih^yyx^u closely placed; the elytra more finely punctate-striate, with the dorsal 

 interstices broader than the strise ; the rostrum very short and closely punctate. 

 Amongst the long series of C. thoracicus before me from Central and South America 

 and the Antilles there is nothing intermediate between these two forms. 



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Cossonus catolethroides, sp. n. (Tab. III. figg. 26, 26 a.) 



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Elongate, depressed, shining, nigro-pieeous, the sides of the elytra indeterminately, the apical half of the 





JLJXV/AJ.W 



rostrum, the antennae (the club excepted), and tarsi rufescent. Head very sparsely punctate, foveate 



between the prominent eyes, the globose basal portion separated from the rest by a transverse groove ; 

 rostrum feebly curved, cylindrical, about two-thirds the length of the prothorax, very sparsely, finely 

 punctate : antennal club large. Prothorax nearly as long as broad, gradually narrowing from a little 

 before the base to the short tubulate apical portion, the base feebly bisinuate; rather sparsely, irregularly 



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