AMERICAN COMPONENTS OF THE TENTYRIIN^ 383 



Var. A — Body nearly similar in form and lustre but broader in 

 the female type, dark rufo-piceous, polished but scarcely 

 with metallic lustre ; head nearly similar, the punctures very 

 sparse ; prothorax fully two-fifths wider than long, the sides 

 rounding anteriorly, becoming parallel in about basal half, the 

 surface not at all impressed at the basal sinuations, rather finely, 

 sparsely punctured laterally, minutely and remotely toward the 

 middle; elytra similar but more rapidly acuminate and pointed 

 behind, with much more impressed lines of subconfused and 

 rather coarser punctures, the intervals similarly finely punctu- 

 late, the humeral callus strong and rounded but more abbre- 

 viated. Length 15.5 mm.; width =5.9 mm. (9)* Arizona 

 (Nogales), — H. F. Wickham acuticauda n. var. 



The female of acnticatida, when compared with siihmetalli- 

 cus, is rather broader, with a larger and more transverse pro- 

 thorax, which is less coarsely and more sparsely punctate later- 

 ally, the elytral humeri rather less broadly rounded and with a 

 larger, more pronounced callus, and the series more impressed. 

 It is probably different specifically from either siibnietallicus or 

 Jmmeralis^ but, because of lack of series of both sexes, I prefer 

 to consider acuticauda as a variety for the present. The Mexi- 

 can species described by Champion under the name Epitragtis 

 grandis, will enter the present genus without doubt. 



Cyrtomius n. gen. 



Besides the characters given in the table to distinguish this 

 genus, its comparatively few members may be known at once 

 by their very distinct facies, due to the obese form, strong con- 

 vexity^ of the median part of the body and coarsely wrinkled 

 integuments. Each elytron, in the species known to me, has a 

 small strong protuberance on the disk at the apex, the tubercle 

 being the posterior limit of the acute upper marginal line of the 

 epipleurae, which do not therefore quite attain the sutural angles. 

 The scutellum is well developed, hairy and rather gradually 

 pointed behind, and the elytra are rather deeply sinuate at the 

 middle of the base, to receive the prominent rounded basal lobe 

 of the prothorax. Three species may be described as follows : — 



Elytra very coarsely and irregularly rugose or \yrinkled on the sub- 

 vertical flanks and toward apex, the pubescence more densely 

 aggregated in the depressed parts of the surface 2 



Elytra not rugose but with patches of denser pubescence 3 



