COS SONUS. 



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from " Mexico," obtained from the Janson collection, may be wrongly labelled as to 

 locality. This insect superficially resembles Megalocorynus de-pressus, Boh. It is 

 nearly related to C. semirufus, which has a very extended distribution, differing from 



the black form of that species in the much less rugose, carinate depression on the 



prothorax and the strongly transverse punctures of the elytral striee. 





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19. Cossonus semirufus. (Tab. II. figg. 26, 26 a.) 



nus semirufus, Boh. in Schonh. Gen. Cure. iv. p. 1009 '. 









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Var. The elytra wholly black ; the disc of the prothorax with a narrow space exterior to the long, rugose, 

 median depression densely, moderately coarsely punctate • the elytral interstices very narrow, closely 



punctured, the seriate punctures large, transverse, and closely packed. 



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Bab. Mexico, Orizaba l (Mus. Holm.) ; Guatemala, Senahu in Vera Paz, Cerro 







Zurril, Zapote (Champion)-, Panama, Bugaba, Volcan de Chiriqui (Champion 

 Colombia, Santa Marta (Mus. Brit.) ; Ecuador, Macas (Buckle//) ; Brazil, Para. 



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Not nncommon in Chiriqui. The type of this insect (?) has rather more than 





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basal half of the elytra rufescent, but this colour sometimes extends over the whole of 

 their surface, or may be entirely wanting, as in the two examples from Zapote and one 

 from Para. The head is somewhat exserted and the exposed portion is densely 





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rostrum is short, rather narrow at the base, abruptly dilated 



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tip, and so densely punctured as to appear opaque. The pro 



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ruo-ose depressed area extending forwards to the short tubulate apical portion, and 



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the base very deeply bisinuate. The elytra are rather broad and flattened, the seriate 



2S being usually crowded and strongly transverse, but they are more rounded 



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tt ixv* less closely placed in the type and in some of the other specimens before me. 

 The anterior tibise are sinuate within. The ventral segments 1 and 2 are depressed 







down the middle in the male. The single example seen from Santa Marta has less 

 than the basal half of the elytra, and the greater part of the ventral surface, rufo- 







the wholly black one from Para represents C. fossatus, Boh.*, in the 

 British Museum. The sculpture of the prothorax, like that of the elytra, is variable, 

 but the long, depressed, rugose area on the disc of the former is always very 





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^•"LSpiCUOU 





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20. Cossonus planirostris, sp. n. (Tab. II. figg. 27, 27 a, $ .) 



Elongate somewhat convex, shining, black, the basal half of the antennae and the tarsi more or less 



ferruginous. Head somewhat exserted. rather small, foveate between the eyes, the interocular space 





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straight, short, flattened, gradually widened outwards, closely punctate, and with the subquadrate apical 

 portion as long as broad, ( 6 ) somewhat convex and with the apical portion transverse ; antennal club 



stout ovate. Prothorax slightly broader than long, moderately rounded at the sides, feebly constricted 

 and much narrowed in front, deeply bisinuate at the base : coarsely, closely punctate, the punctuation 



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