ACEOPTEEOXYS. 13 



ACROPTEROXYS. 



Corpus elongatum (elytris apicibus aculeatis, lateribus subparallelis), supra et infra fortiter punctatum, 

 Prostemi processus intercoxalis ad apicem latior, truncatus, punctatus, parum deelivus. Striola ocularis 

 nulla. Tarsi subtus spongiosi, haud late ciliati. Antennarum clava angustata, quinque-articulata. 

 Sexus differentia latet. 



The species for which I propose this new generic name are somewhat similar to 

 those of the genus Langurites. The principal diagnostic character is the peculiar way 

 in which the elytra are acuminate at the apex, the apices being neither toothed nor 

 excised. The sutural margin is nearly straight, but the lateral margin is brought in to 

 meet it acutely from about one fifth of their length. The striation of the elytra is 

 distinct, and the punctures deep. The form of the thorax is very much as in Langurites, 

 parallel and rather flat and acutely margined. The eyes are finely faceted, and there is 

 no ocular striola. The species, A. caudatus, which I regard as the type of the genus 

 Acropteroxys is coarsely punctured above and beneath ; and has the front part of the 

 prosternum very rugose, and the rugae interspersed with punctures. One or two other 

 species which I refer to it are allied to Languria gracilis, Newman, and are more 

 finely punctate than A. caudatus, but have the elytra similarly acuminate. L. gracilis 

 will probably be found to be congeneric, its elytra, however, are less acuminate ; the 

 general flat depressed form is the same, as is the widened apex and sculpture of the 

 prosternal process. 



I include two species in this genus ; one is apparently of wide distribution, ranging 

 from the Middle United States to Guatemala, the other from Mexico. 



1. Acropteroxys caudatus. 



Languria caudata, Sturm, in litt. 



Nigro-seneus, nitidus ; capite prothoraeeque crebre fortiter punctatis ; elytris fortiter punctato-striatis, apicibus 

 acuminatis et lsevigatis ; corpore subtus fortiter punctato ; prosterno antice rugoso. Long. 9-11 millim. 



Eab. Mexico (ex coll. Sturm), Yolos (Salle). 



Head very coarsely punctured ; eyes rather prominent, moderately but not coarsely 

 faceted ; without striolse. Thorax very coarsely punctured ; transversely rugose 

 beneath, the rugae with punctures irregularly interspersed, especially distinct on the 

 sides and on the prosternal process, the latter broad and wider at the apex ; the sides 

 are very straight, and the length is one and a half times the breadth. Elytra with the 

 shoulders much wider than the thorax ; the sides almost parallel for three fourths of 

 their length, acuminate beyond; punctate in series, the punctures coarse and often 

 confluent. Breast and abdomen punctured, the basal segment of the latter more 

 densely and coarsely than those succeeding. Legs and antennae blackish, the former 

 slightly pitchy at the base, the latter with the third joint longer than the fourth. 



Only three specimens have come under my notice. Two of these are from Yolos ; 

 the third is from Sturm's collection, without special locality from Mexico. 



