





42 



KHYNCHOPHOEA. 



Hah. Mexico l ~± (Truqui), San Andres Tuxtla, Parada (Salle), Jalapa, Oaxaca (Mm. 

 Brit). 



I have seen the types of the above forms and they certainly all belong to one 

 variable species: M. capitatus has the sides of the prothorax less rounded than usual 

 and M . conicirostris is simply a female of M. depressus. Specimens occur with the 



elytra and abdomen ferruginous. The males have the first and second ventral segments 

 very broadly flattened down the middle. 



COSSONUS. 



Cossoms, Clairville, Ent. Helv. p. 58 (1798) ; Schonherr, Gen. Cure. iv. p. 994, and viii. 2, 



Woll., but they are connected with the typical Cossoni by intermediate forms. The 



tropical eastern representatives are extremely like some of those inhabiting Central 

 and South America and might easily be confounded with them. Many of these insects 

 vary greatly in size, and in some cases there is a considerable variation in the colour 

 of the elytra. They have the rostrum more or less distinctly dilated anteriorly in 

 both sexes, except in C. eatolethroides, C. convexirostris, C. latus, and a few other 

 forms. C. sjpathula, Boh., and its allies would perhaps be better placed in a separate 

 genus. The sexual characters are not very pronounced, but the first ventral segment 

 is often hollowed down the middle in the male. The Central- American forms may be 

 grouped thus : — 



a. Prothorax not abruptly excised near the apex. 



a 1 . Rostrum (except in some specimens of C. latus arid in C. puncticollis) 



more or less distinctly widened or dilated anteriorly. 

 a 2 . Prothorax without definite basal excavation^ feebly bisinuate at the base. 



a 3 . Head with the (globose) basal and anterior (inter-ocular) portions 



continuous above, closely punctured, 

 a 4 . Rostrum sulcate, strongly dilated anteriorly ; elytra very long and 



b*. Rostrum not sulcate, strongly dilated anteriorly; elytra moderately 



long. 

 a . Body almost glabrous 



Species 1. 



Species 2, 3. 







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p. 266 (part.) ; Wollaston, Trans. Ent. Soc. Lond. 1873, pp. 438, 483, 568 ; Leconte, Proc. 

 Am. Phil. Soc. xv. pp. 337, 338 (1876). 

 Borophlceus, Wollaston, loc. cit. pp. 438, 484, 569. 



About 140 members of this widely-distributed genus have been described, including 

 a considerable number from Mexico. Schonherr's first section (Stirps 1, Cent. I.), 

 to which the European type, C. ferrugineus, Clairv., belongs, is not represented within 

 our limits, and his Stirps 2, based upon the Mexican C. depressus, Boh., has been 

 separated by Wollaston under the name Megalocorynus. The pine-bark species 



(numerous in N. America, Mexico, and Guatemala) nearly all belong to Borophloeus, 



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b\ Body clothed with very minute hair-like scales, conspicuous 



beneath ; prothorax densely punctate and sharply carinate . . Species 4. 



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