(Joleopterological Notices, IV. 471 



Tenebrioaida3, possessing an entirely analogous abdominal impres- 

 sion, which might at first sight be supposed to have been developed 

 from the same causes and for identical purposes, the impression is 

 almost always notably more densely punctured than the surround- 

 ing surface. The beak is not subject to great sexual modification, 

 although there are a few exceptions to this rule, as for instance 

 sparsa, in which it is distinctly shorter in the male than in the 

 female. 



The following table probably includes a large proportion of the 

 forms inhabiting the United States : — 



Tibise sinuate externally and prominent at apex ; anterior cox^ narrowly 

 separated ; impression between the head and beak feeble ; setae more 

 developed, generally bristling also from the under surface of the beak ; 

 scutellum usually short, transverse and broadly, deeply impressed, nearly 



as in Trichobaris ; body never with seneous surface lustre 2 



Tibiae straight, occasionally with a small external dentiform process at apex 

 but never broadly sinuate ; anterior coxae more widely separated ; impres- 

 sion between the head and beak strong but always broadly angulate when 

 viewed in profile ; scutellum small, subquadrate or rounded, not broadly 

 impressed; setae generally inconspicuous ; surface lustre frequently aene- 

 ous 9 



2 — Scutellum transverse and impressed 3 



Scutellum small, rounded, not transverse 8 



3 — Elytra at least twice as long as the prothorax, generally distinctly more.. .4 



Elytra very distinctly less than twice as long as the prothorax 7 



4 — Elytral intervals strongly elevated, narrow and never more than slightly 

 wider than the grooves, the second and third generally not at all wider 



than the others 5 



Elytral intervals broader, flat and feebly elevated, the grooves unusually 



shallow ; second and third intervals much wider 6 



5 — Elytral callus prominent, the elytra being abruptly and distinctly wider 

 than the prothorax and with the sides parallel in basal two-thirds. 

 Abdomen clothed with rather long white subrecumbent hairs ....1 ingeilS 



Abdomen with short sparse setae 2 striata 



Elytral callus not prominent ; body oval, the prothorax strongly narrowed 



from the base 3 iinibilicata 



6 — Body extremely densely punctured throughout 4 arizoilica 



T — Small species, dark red-brown in color, the elytra still paler ; elytral setae 



almost scale-like, recurved 5 Iiispidllla 



Much larger species, black throughout ; elytral setae slender and bristle-like. 



Body very robust, oblong ; elytral intervals all much wider than the 



grooves, the punctures broadly confused but forming nearly even single 



lines on the first, fifth and seventh, smaller than in utrcnua and not so 



coalescent 6 gravida 



