MELOLONTHID^E MACRODACTYLID^E. 133 



(181) 2. * Rhizotrogus Drakii. Drakes Rhizotrogus. 



E. (Drakii J castaneus, nitidus, punctatus ; antennis testaceis ; podicemayno. 

 Drake's Rhizotrogus, chestnut, glossy, punctured ; antennae testaceous ; podex large. 



Length of the body 9^—11^ lines. 



A single specimen taken in the Jonrney from New York to Cumberland-house. 

 B and C, by Mr. Drake in Massachusets. 



DESCRIPTION. 



This species is extremely similar to the last, it differs principally in having the sides of the 

 scutellum more thickly punctured, the ridges of the elytra, except the sutural one, are scarcely dis- 

 coverable, and the podex larger and rounder at the apex : the tarsi also are longer in proportion : 

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



B. Much larger, and the elytra appear somewhat more thickly punctured, but it is scarcely distinct. 



C. Like A, but the ridges of the elytra are all discernible. 



Family MACRODACTYLIDiE. Macrodactylidans. 



LXXII. Genus DICHELONYCHA. Harr.s 



Labrum transverse, lanceolate, scarcely emarginate. 



Mandibles short, trigonal, incurved, toothless, acute : molary space transverse, furrowed. 



Maxillce minute, linear, bidentate with short teeth. 



Labium subquadrangular, not distinct from the mentum. 



Palpi maxillary four-jointed; first joint very minute; second longer than the third, obconical ; 



third triangular ; last joint as long as the three others together, very large, subsecuriform. 



labial three-jointed ; joints short, subfiliform ; last truncated. 



Antennas, nine-jointed ; scape obconical, incrassated ; pedicel subspherical ; third and fourth joints 



subfiliform ; fifth obconical ; sixth subturbinate ; the three last forming a short subovate 



knob. 

 Body narrow, subcylindrical. Head subquadrangular ; nose transverse, separated by an indistinct 

 obtusangular line, anteriorly reflexed ; rhinarium transverse marked with a transverse series of rather 

 large punctures ; eyes prominent ; canthus entering : prothorax hexagonal, the sides being obtus- 

 angular : scutellum rounded at the vertex, dilated at the base : elytra linear, rounded at the apex, 

 obsoletely ridged, wrinkled; epipleura vertical, narrow: legs rather slender; hind legs long; cubit 

 tridentate ; tarsi filiform ; claws equal, all bifid at the apex : podex subtriangular. 



6 I received a species of this genus under this name from Dr. Harris, which therefore I adopt. I had call.d it Steiiia. 



