118 Mr. G. C. Champion's Revision of the Mexican 



Hah. Mexico, Jalapa (Hoge). 



One specimen, assumed to be a male. Gorham hesitated 

 to describe this species from a single example ; but it is so 

 distinct, and so closely allied to another form subsequently 

 received from Orizaba, that there can be no risk in naming 

 it. The narrow, bright aeneous body, the rather long 

 gibbous prothorax, with conspicuously crenulate lateral 

 margins, the rufous legs, and the long posterior tarsi are 

 characteristic. 



6. List r us senilis. 



Dasytes senilis, Lee, Proc. Acad. Phil, vi, p. 170 (1852). 

 Listfus senilis, Lee, op. cit. 1866, p. 358 ; Casey, Ann. 



N. York. Acad. Sci. viii, pp. 542, 551, and ix, p. 682. 

 Listrus canescens, Gorh., Biol. Centr.-Am., Coleopt. iii, 



2, pp. 126, 329 {nee Mann.). 

 ? Listrus clavicornis, Casey, loc. cit. viii, pp. 542, 552, 



(J. Anterior tibiae armed with a rather stout spur at the inner 

 apical angle ; prothorax nearly as broad as the elytra, rounded at 

 the sides ; fifth ventral segment truncate at the apex. 



$. Head and prothorax smaller, the latter less rounded at the 

 sides. 



Hab. United States, Kansas, Colorado, New Mexico, 

 Arizona, Texas; Mexico; Guatemala; Panama. 



A common N. -American species extending southward 

 along the mountains to Chiriqui. In typical examples the 

 prothorax is very densely punctulate and opaque; but 

 amongst some of those before me from Guatemala the 

 puncturing is more scattered and the interspaces shining, 

 these latter doubtless belonging to L. clavicornis, Casey. 

 The aeneous (not black, as stated by Casey) body, the 

 uniform long, close, cinereous vestiture, and the black 

 legs and antennae mainly distinguish L. senilis. Specimens 

 from Texas {Mus. Oxon.) agree exactly with others before 

 me from Mexico. 



7. Listrus alhidus, n. sp. 

 Moderately elongate, rather broad, opaque; fusco-olivaceous, 

 the antennae (except the basal joint and one or more of the apical 

 ones, which are infuscate) and legs (the tips of the tarsi excepted) 

 rufo-testaceous ; thickly clothed with adpressed white hairs, the 

 marginal cilia short. Head very densely punctulate; antennae 

 short, widened outwards, joints 5-10 serrate, 5 triangular, larger 

 than 6, 6-10 transverse, 9 and 10 much broader than 8, 11 ovate. 



