MALACHIDAE. 193 



In some genera of this tribe, the middle and hind coxae resemble 

 those of Byturus, which, however, differs by the anterior cox* 

 being separated by the prosternum, and by the tarsi being lobed 

 beneath. To add to the resemblance, the sixth ventral segment 

 is frequently by no means distinct. 



Our genera are as follows, all having the last joint of the max- 

 illary palpi nearly cylindrical. 



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

 Claws of the tarsi with membranous appendages, 



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

 thorax without impressed lines ; 



Anterior tibia? with a range of spines on the outer margin ; thorax 



not serrate or ciliate at the sides. Pkistoscelis. 



Anterior tibia? not spinous ; thorax ciliate at the sides which are 

 usually serrate. Listkus. 



which are narrow and free almost to the base ■ thorax with an im- 

 pressed line near the lateral margin ; 



Both claws with appendages Eschatoceepis. 



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



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



First joint of tarsi shorter than the second; claws without appendages; 



(body cribrate-punctate, edge of thorax and elytra serrate.) Melyeis. 



The species in my collection appertain as follows, to the genera 

 above mentioned. Those of Pristoscelis may be divided into three 

 groups : 1. Pubescence not erect, appendages of claws rounded 

 at tip (Byturosomus and Emmenotarsus Motsch.) ; D. rufipes 

 Motsch., (griseus || Lee. ) ; brevicomis Lee: 2. Pubescence not 

 erect, appendage of one claw truncate (Trichochrous Motsch.) • 

 D. fuscus Lee. : 3. Pubescence erect, appendages of claws 

 rounded at tip (Emmenotarsus Motsch.) ; D. ?*uftpennis Lee, D. 

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

 (Proc. Acad. Nat. Sc, Philadelphia, YI, 169.) 



To Listrus Motsch., belong D. canescens Mann., and allied 

 species ; this and the preceding genus is distributed from Kansas 

 to the Pacific. 



Of Eschatocrepis but one Californian species, D. constrictus 

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

 nernus in characters, but differs in appearance. Of Allonyx also, 

 but one Californian species, D. sculptilis, is known. A single 

 nondescript species of Dasytes, from California, is in my collection ; 

 D. breviusculus Motsch., is nearly related to it. 

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