STUDIES IN THE AMERICAN BUPRESTID^E 1 53 



ually rounding and converging in apica! two-fifths, the short and broad 

 prolongation rather abruptly formed, more cupreous and with the outer 

 angles moderately rounded, the sutural feebly dentiform; surface 

 sparsely pubescent, with moderate shallow, closely and coarsely punc- 

 tate sulci in about inner half, densely, coarsely punctured, confluently 

 so laterally, the callous spots strong but small and very sparse; under 

 surface rugose, deeply sulcate along the axial line including the first 

 ventral, the fifth with two vestigial ridges, the apex transversely emar- 

 ginate (c?), or broadly and obtusely rounded (9). Length 16.5-18.7 

 mm. ; width 6.0-6.8 mm. California (Tulare Co.) horni Cr. 



A — Similar but larger, stouter, more dusky and obscure in coloration, 

 the head more coarsely rugose, the prothorax feebly inflated near the 

 middle of the sides, the medial sulcus obsolescent, the punctures 

 laterally denser and the anterior callus near lateral fourth much 

 stronger; elytra nearly similar but with the outer angles of the pro- 

 longation much more broadly rounded; fifth ventral (9) without 

 trace of ridges and with the apex more acuminate and very narrowly 

 rounded. Length (9) 17.7 mm.; width 6.g mm. California (Ka- 

 weah) ampliata n. subsp. 



The variety, mentioned by Crotch, having the last ventral segment 

 of the female tridentate at tip, I have not seen. It is probably a 

 widely distinct species if the sexual characters are correctly stated. 



Group V — Type tenebrosa Kirby. 



The general habitus in this group dififers greatly from that charac- 

 izing any of the preceding, the body being shorter and relatively 

 broader, with the prothorax more transverse as a rule, generally in- 

 flated at the sides before the middle and with the surface much more 

 unevenly impressed and sulcate. The elytra are more or less rapidly 

 narrowed behind and briefly produced, the prolongation either nar- 

 row and acuminate as in tenebrosa and related species, or more broadly 

 obtuse as in crassicollis, where it approaches the form described above 

 in horni, but the apices are in all instances entire at tip. The species 

 are rather numerous and more fully described by various early authors 

 than in either the obscura or divaricata groups. After rather atten- 

 tive study of the literature and of such material as is at hand, I would 

 propose the following arrangement of those discovered thus far: — 



Pronotal sulcus generally broader, densely punctate, having a small central 

 callus by which it is in no measure interrupted ; middle tibiae of the male 

 unmodified ; head with an elevated transverse line between the eyes 2 



Pronotal sulcus narrower, with a large central callus by which its continuity 



