CAI.ANDKID^E— COSSONIN.E— (JOSSONINI. 155 



cinisi(lLT;il)ly lur^^cr than either of those deseribcd l)eh)W or than the Aix 

 species, C. iiiarionii Oust., which is midway in size between ours; but all 

 of them, and nutahly the Aix species, liave a mucli ]oiij;er beak than either 

 ot ours. Ill i;-eiieral, l)iit in a va^iie \va\', our C. fjahbii most nearl\' reseniljles 

 (J. spielber//ii ; our other species can liardh- l)e conijiared witli any one of 

 the -European fossils, all of which, it seems to me, require renewed exami- 

 nation. The Aix species in particidar with its long and slender snout and 

 very arched body can hanlly be regarded as a Cossonus. 



Table of the species of Cossoiinx. 



Body more than four times as loug as high, contracte<l at ba.sc of elytra; beak less 

 than twice as long as broad ; eyes oblique, anterior rvtvs. 



P.ody less than three times as loug as high, not contracted at baseof tlytra; beak 

 fully twice as loug as broad; eyes transverse, median tjahhii. 



Cossonus rutus. 

 PI. XII, Fig. 7. 



A rather stout-bodied form with short and stf)Ut beak. Head and pro- 

 thorax together foriiiing without the beak a perfect half-oval, the beak 

 about as long as the head and hardly twice as long as broad; e\es modei- 

 ately large, more than lialf as long as the breadth of the beak, round-oval, 

 obli(|ue, the facets ahno.stexactlv 0-()2""" in diameter; head smooth. IVo- 

 thorax fully half as high again as longs bluntly subrugose and very iinelx , 

 faintly, ami shallowly |)unctate. Elytra verv finely and bluntly scabrous, 

 l)roadly arched with faintly graiudate, slightK' elevated, slender carina-, 

 the pvgi<lium apparently covered. 



Length exi-lusive of beak, 4"""; height, 1 •;")"'"'; length o I" beak, Oo;')""". 



Roan mountains, western Colorado, iippeiiiiost la\crs. One specimen, 

 N<is. 945 and 94(J, II. S. G(?ological Survey. 



Cossonus gabrii. 



PI. XII, Fig. 11. 



A slender, regular, oblong obovate form with rather short beak. ITead 

 nniderately large, regular, apparentl\ witli the same sculptiu'e as the pro- 



