MALACmiDAE. 215 



First joint of tarsi not shorter tlian the second (body punctured) ; 

 Head without beak. 



Claws of the tarsi witli membranous apjjendages, 



which are broad and connate entirely or in great part with the claws ; 

 thorax without impressed lines ; 

 Anterior tibise witli a range of spines on the outer margin ; thorax 

 not serrate or ciliate at the sides. Pristoscelis. 



Anterior tibis not spinous ; thorax ciliate at tlie sides whicli are 

 usually serrate ; 

 Appendages of claws equal. Listrus. 



Appendages of claws unequal. Dolichosoma. 



Which are narrow and free almost to the base ; thorax with an im- 

 pressed line near the lateral margin ; 

 Both claws with appendages. Eschatocrepis. 



One claw with an appendage, the other toothed at base. Allonyx. 

 Claws of the tarsi broadly toothed, without appendages. Dasytes. 



Head with a flat beak, as long as the head itself; 



Claws of the tarsi slender without appendages. Mecomycter. 



First joint of tarsi shorter than the second ; claws without ap[ieudages 



(body cribrate-i^unctate, edge of thorax and elytra serrate). Melyris. 



The species in our collections appertain as follows, to the genera 

 above mentioned. Those of Pristotjcelis may be divided into three 

 groups: I. Pubescence not erect, appendages t)f claws rounded 

 at tip (Byturosomus and Enunenotarsus jlJolsvh.); 1). rufipes 

 Motsch. (^r/^'eM.s||Lec.) ; brevicornis hec. : 2. Pubescence not 

 erect, appendage of one claw truncate (Triclioclirous Mo/sdi.); 

 I), fuscus Lee. : 3. Pubescence erect, appendages of claws 

 rounded at tip (Emnienotarsus 3Iotseh.); J>. rujl/wtitiis Lee, I). 

 (juadricoUis Lee., and the remaining species of my group A — a. 

 (Proc. Acad. Nat. Sc, Philadelpliia, Yl. KID.) 



To Listrus Motach., belong D. canescenfi Mann., and allied 

 species; this and the preceding genus is distributed from Kansas 

 to the Pacific. 



Of Eschatocrepis but one Californian species, D. consirkius 

 Lee., is known to us; it is closely allied to the European Haploc- 

 nemus in characters, l)ut differs in appearance. Of Allony.x, also, 

 but one Californian species, 1). seulptitii^, is known. Several ' 

 species of Dasytes occur in California, and one in Texas. 



To Melyris belong two species from the Atlantic States, and 

 two from the Pacific. 



Mecomycter contains one small sp(,'eics from Kansas, and 

 shows a tendency towards Prionoccrus. 



Dolichosoma contains three species, distributed from Canada 

 to Texas. 



