134 NORTHERN ZOOLOGY. 



This genus evidently belongs to the same family with Macrodactylus, from which it is distin- 

 guished by having its maxilla? armed only with two teeth, the last joint of its palpi of a different 

 shape, and its labium approaching to a square form : whereas in the latter genus the maxilla? are 

 more conspicuous and armed with three teeth, the last joint of the palpi is subovate, and the labium 

 is oblonp; and channelled. 



The species of this genus, as far as at present known, appear to be confined to the more northern 

 parts of the new world ; I have seen none south of the province of Massachusets, from whence I 

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

 linearis Herbst. 7 



(182) 1. * Dichelonycha Backii. Back' 's Dichelonycha. 



D. ( Backii) nigra albiJo-pilosa ,■ elytris aneo-viridibvs sericeis ; antennis castaneis, clava nigra ; naso valde, refiexo. 

 Back's Dichelonycha, black : hairy, hairs white ; elytra bronzed-green, silky ; antennae chestnut with black knob ; nose 

 much reflexed. 



PLATE II. FIG. 6. 



Length of the body 4A lines. 



Several specimens taken in Lai. 54°. 



DESCRIPTION. 



Body black, glossy, hairy, especially underneath, with white decumbent hairs; above thickly and 

 coarsely punctured. Nose much reflexed, margin entire ; stalk of the antenna? chestnut : elytra 

 silky, green, more or less bronzed. 



Variety B. Antenna? rufous. Tarsi pale chestnut. 



(183) 2. * Dichelonycha virescens. Virescent Dichelonycha. 



D. ( virescens J picea, subtus piloso-nivea ,- antennis pedibusque flavo-testaccis ; elytris jlavis sub luce virentibus ; protltorace 



dorso subcanaliculato, utrinque impresso. 

 Virescent Dichelonycha, piceous, underneath covered with snowy hairs; antenna? and legs yellow-testaceous ; elytra yellow 



with a green lustre : prothorax with a slight dorsal channel, and an impression on each side. 



Length of the body 4f — 5 lines. 



Taken in Canada by Dr. Bigsby, in Nova Scotia by Dr. Mac Culloch, in Massa- 

 chusets by Dr. Harris, and in Pennsylvania by Dr. Horsfield. Dr. Bigsby found 

 it common on the different species of Salix. 



7 Schon. Synon. iii, Append. 103, 143. 



