56 



elytra, except the siitural one, arc scarcely discovtrablc. .ind the podcx 

 larger and rounder at the apex : the tarsi also arc long« r In proi)orticn : 

 the knob of the antennx in all the specimens is longer. 



B. Much larger, and the elytra appear somewhat m(^i\- (iufklv juinc- 

 tured, but it is scarcely distinct. 



C. Like A, but the ridges of the elytra ;irc v\\ disccrnibk-. |A ra. c of 

 the preceding species.] 



Genus Dichelonych.\ Harris. — Labrum Iran*, verse, lanceolate, scarcely 

 emarginate. Mandibles short, trigonal, incurved, toothless, acute : molary 

 space transverse, furrowed. Maxilla; minute, linear, bidentate, with short 

 teeth. Labium subquadrangular, not distinct from the mentum. Palj)! 

 maxillary four-jointed ; first joint very minute ; second longer than the 

 third, obconical ; third triangular : last joint as long as the three others 

 together, veiy large, subsccuriforn"!. Palpi labial three-jointed : joints 

 short, .subfiliform ; last truncated. Anlennai nine-jointed; scape obconi- 

 cal, incrassated ; pedicel subspheriral : t-urd ar.vl iourfh joints subfiliform ; 

 fifth obconical ; sixth subturbinate ; the tiiree la^t fonning a sJiort sub- 

 ovate knob. Body narrow, snbcylindrical. Hca«l suDciuadranguiar ; nose 

 transverse, separated by an indistinct ubtuiangular line, anteriorly rcilexed; 

 rhinarium transverse marked \.-:th a transverse series vX rather large punc- 

 tures ; eyes prominent ; canthus entering: j)roihora\ hexagonal, the sides 

 being obtusangular : scutelkun lO'imded at the verte.\, dilated ^^ the base : 

 elytra linear, rounded at the apex, obsoletcly ridged, wrinkled ; cpij.»leura 

 vertical, narrow : legs rather .slender ; liind legs long ; cubit tridenlate ; 

 tarsi filiform ; claws equal, all bilid at the a.|>e.\ : jjodex sublrlangular. 



[134.] This genus evidently belongs to the same family with Macrod- 

 aciyhis, from which it is distinguished by ha\ ing its maxillie armed only 

 with two teeth, the last joint of its palpi of a (.liiTiTent sliape, and its 

 labium approaching to a square form : whereas in the latter genus the 

 maxillai are more conspicuous and armed with lliree teeth, th.e last joint 

 of the palpi is subovate, and the labium is ol)long and cliannelled. 



The species of this genus, as far as at present known, appear to i-e 

 confined to the more northern parts of the new world : 1 have seen none 

 south of the province of Massachusetts, from whence 1 ha\e received 

 specimens both from Dr. Harris and Mr. Drake. Type of the genus 

 Melolontka liiicaris Herbst. 



182. DiCHELONVCHA Backii Khby. — Plate ii., llg. 6.- Length of 

 body 4^^4 lines. Several specimens taken in Lat. 54^^. 



Body black, glossy, hair}', especially underneath, with white decumbent 

 hair.i ; above thickly and coarsely punctured. Nose much refiexed, inar- 



