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COSSONUS. 



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34. CoSSOnuS parvicollis, sp. n. (Tab. III. figg. 7, 7 



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Moderately elongate, depressed, shining, nigro-piceous, the elytra with the humeri and lower margins inde- 

 terminately rufescent, the tarsi and the base of the antennae ferruginous. Head small, foveate and 

 punctured between the somewhat prominent eyes, the globose basal portion smooth ; rostrum rather 

 more than half the length of the prothorax, quadrangularly dilated at the apex, the basal portion a little 

 longer than the apical, rather sparsely punctate. Prothorax nearly as long as broad, narrow, the sides 

 subparallel at the base and arcuately converging anteriorly to the distinct subapical constriction, the 

 base bisinuate ; closely, coarsely punctate, the disc with a shallow excavation and a short longitudinal 

 carina at the base, preceded by a long median sulcus. Scutellum very small. Elytra much wider than 

 the prothorax, subparallel in their basal half, the humeri rounded and not prominent ; closely, coarsely 

 crenate-striate, the interstices narrow, raised, minutely uniseriate-punctate. 



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Length 3±, breadth 1^ millim. 



Hab. Mexico, Guanajuato (Salle 



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One specimen. Separable from C. rufonotatus by the longer, mesially silicate, 

 basally carinate, more coarsely punctured prothorax, the minute scutellum, the less 

 prominent humeri, and the less transverse apical portion of the rostrum. The relatively 



narrow prothorax, broad elytra, with rufous humeral spot, and com 



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head, render C. parvico 



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35. Cossonus aterrimus, sp. n. (Tab. ill. figg. 8, 8 a, s .) 



Moderately elongate, rather convex, shining, the elytra often alutaceous and subopaque, black, the base of the 

 antennse and the tarsi more or less ferruginous. Head longitudinally foveate, feebly transversely grooved, 

 and punctate between the eyes, the globose basal portion obsoletely punctured, the eyes depressed ; 

 rostrum short, stout, transversely, subquadrangularly dilated at the apex, the basal portion longer than 

 the apical, closely punctate, apparently somewhat smoother in the $ . Prothorax a little broader than 

 long, rather convex, moderately rounded at the sides, narrowed and very feebly constricted in front, 

 deeply bisinuate at the base ; coarsely, closely punctate, the punctuation becoming finer and more diffuse 

 on the disc, the latter with a triangular, coarsely rugose, shortly carinate depression at the base, the 

 depression preceded by a few biseriately-arranged coarse punctures. Scutellum small. Elytra wider 

 than the prothorax, moderately long, subparallel in their basal half ; punctate-striate, the punctures 

 becoming larger and transverse towards the base and fine towards the apex, the interstices faintly uni- 



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seriate-punctate, feebly convex, sinuous, narrower, and more raised anteriorly. Ventral segments 1 and 2 

 hollowed down the middle, and 5 transversely depressed at the apex, in the <$ , 1 and 2 also feebly 





depressed in the $ • 



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Length 3i-5, breadth 1^-1 g millim. ( 6 $ .) 



Hab. Mexico, Toxpam [type] (Salle), Atoyac (Duges), Motzorongo (Flohr), Yucatan 





(Gaumer) : Nicaragua, Chontales (Janson) ; Costa Rica, Irazu, Cache (Bogers 



A perplexing insect, with the puncturing of the prothorax and elytra finer 



osus, and the general facies of the smaller ; 



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C. scrobiculatostriatus and C.perfid 





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C exaratus. The various Costa Rican specimens have a long frontal fo 



and the head almost without transverse groove between the eyes; the two from 

 Motzorongo were sent with C. exaratus, but they cannot be included under that 



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species, from which they differ in their more depressed eyes, &c. A male from 



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Toxpam is figured. 





