150 MEMOIRS ON THE COLEOPTERA 



much coarser, more widely and irregularly spaced serial punctures 

 and wholly pale legs. The color of the elytra in one of the examples 

 at hand is black, with strong bronze lustre, and in the other bright 

 and pure blue, but there seems to be no difference otherwise. 



Acropteroxys Gorh. 



This genus is very closely allied to Languria, differing only, so 

 far as can be observed externally, in the more gradually narrowed 

 and more apically acute elytra; this gives to them a rather different 

 habitus, however, and the name can be advantageously retained 

 for that reason. The author assigns as the type a peculiarly sculp- 

 tured Mexican species, described under the name caudatus and 

 states that the American Languria gracilis of Newman, also forms 

 part of the genus, but erroneously places a number of Mexican 

 species with gracilis as varieties, which they cannot be regarded in 

 any sense; one of these is described below under the name aztecana. 

 It is to be presumed that Languria divisa Horn, can also enter this 

 genus. The following is a species allied to divisa but differing greatly 

 in the form of the antennal club: 



Acropteroxys thoracina n. sp. Rather slender and convex, the lustre 

 above slightly alutaceous, polished beneath; body, legs, coxse and antennae 

 black, the under surface of the head with a basal pale spot, the prothorax 

 above and beneath ferruginous, with an irregular median basal spot of 

 black above, and, beneath, a black area outside of each coxa but not 

 attaining the sides; head about as wide as the prothorax,. strongly but 

 sparsely punctate, the eyes large and rather prominent; antennae longer 

 than the prothorax, the club as long as the remainder, subparallel, wide 

 and 5-jointed; prothorax slightly elongate, parallel, with feebly arcuate 

 sides and acute though scarcely prominent basal angles, the punctures 

 moderate in size but deep, sparse; scutellum black, smooth, broadly 

 angulate behind; elytra distinctly wider than the prothorax, with rounded 

 humeri, between three and four times as long as wide, the sides straight 

 and parallel to about posterior two-fifths, where they gradually and 

 arcuately converge to the very narrowly obtuse apex, each tip narrowly 

 rounded ; punctures rather coarse, very deep, close-set in unimpressed 

 series, gradually finer posteriorly but very nearly attaining the apices, the 

 intervals each with a series of minute and widely spaced punctules; 

 abdomen minutely, remotely punctulate, more distinctly and less sparsely 

 toward tip; mesosternum coarsely and perforately punctate. Length 

 8.7 mm.; width 1.6 mm. Arizona (Huachuca Mts.), Knaus. 



At first I considered this to be divisa Horn, under which name it 

 had been sent to me, but having since found an example, collected 



