



cossonus. 



51 





I 



L 





. 









■ 

 " 



15. Cossonus silbermanni. (Tab. II. fig. 22, 22 a, $ .) 



P hlceophagus silbermanni, Boh. in Schonh. Gen. Cure. iv. p. 1048 l . 



Hdb. Mexico 1 (Edge, in coll. Solari), Chilpancingo in Guerrero (H. H. Smith), 



■ 



■ ■ . ■ 



. ■ 

 ■ 



Parada in Oaxaca {Salle). 



..... 

 I have not seen the type of this species, which cannot now be found in the 



Stockholm Museum, but the four specimens before me, including one ( $ ) thus 



in the Salle collection, agree very nearly with the description. This insect 



■ 



has a comparatively elongate, subcylmdrical rostrum, with the slightly widened apical 



portion longer than in the other Mexican Cossoni. The anterior portion of the head 

 (with the depressed eyes) is small, and much narrower than the smooth, globose 

 basal portion. The prothorax is subparallel at the sides posteriorly, and very coarsely 

 punctate, especially towards the base, which is almost unimpressed and has a short 

 median carina. The elytra are long, much wider than the prothorax, rather convex, 



very coarsely crenate-striate, with narrow raised interstices. The male has a slightly 

 shorter rostrum than the female, and the first two ventral segments feebly depressed 

 down the middle. C. silbermanni is not unlike the N.-American C. piniphilus, Boh., 



■ 



■ 



V 



. 



but it has the rostrum nearly as long as the prothorax, &c. The Oaxaca specimen 



is figured. 





■ 



16. Cossonus cavirostris, sp. n. (Tab. II. figg. 23, 23 a, 6 .) 



gate, rather broad, depressed, moderately shining, finely alutaceous above, ferruginous or fusco-ferruginous. 

 Head somewhat exserted, densely punctate, foveate between the large and feebly convex eyes, and 

 without trace of constriction behind them ; rostrum very short and broad, abruptly dilated anteriorly, 



densely punctate, transversely grooved along the apical margin, and with a deep, elongate, almost 

 smooth, lanciform, median sulcus extending upwards to the frontal fovea ; autennal club ovate, 

 moderately large. Prothorax transverse, strongly rounded at the sides, constricted and much narrowed 

 in front, deeply bisinuate at the base, broadly depressed in the middle behind; closely, unequally 



punctate, the punctures coarse and crowded along either side of the smooth, sharply-defined, mesially- 

 widened, median carina, and more diffuse and finer on each side of the rugose basal depression. 

 Scutellum comparatively large, subquadrate. Elytra elongate, a little wider than the prothorax, parallel, 



flattened or transversely depressed below the base, the humeri subangular; coarsely seriate-punctate, 

 the punctures strongly transverse along the basal portion of the sutural stria, the interstices rather 

 narrow, somewhat convex (especially at the base, sides, and apex), and with scattered minute punctures. 

 Beneath very sparsely punctate; ventral segments 1 and 2 broadly depressed down the middle in 

 the 6 • Tibige flattened, broad, and sinuate, the anterior pair with a triangular tooth on the lower 









edge towards the tip in the <$ . 



LengthW-9i, breadth 21-3 millim. (<??.) 



Hob. Costa Rica, San Carlos (U.S. Nat. Mus.); Panama (Mus. Brit., coll. Fry). 



■ 





Six specimens, scarcely differing in colour. A large, broad, depressed form, not 



• _ 



■ 





■ 



unlike Megalocorynus depressus, with a very short, broad, densely-punctured, apically- 

 dilated rostrum in both sexes ; the rostrum with an almost smooth, lanciform 



' 







♦ 







excavation in the middle above ; the head exserted ; the prothorax transverse, strongly 



HH 2 



. 



■ 



■ 







. 









