r 



NORTB OF MEXICO. 345 



TENEBRIO, /. 

 Tcnebrio, Linn., Syst. Nat. Ed. VI; Neatns, 1 \. A., p. 233. 



The characters of this genus are too well known to need special comment. 

 < >ur species are four in numb :r, and may be distinguished as follows : 

 Trochantin ol middle coxa? verj distinct. 



Surface dull, opaque. o b s c u rus. 

 Surface mure or less shining. 



Thorax broader than long. molitor. 



Thorax sub-quadrate. casl a n eus . 



Trochantin of middle coxa? small. tenebrioides. 



T. obscurus, Fab. El. 1. 1 16. 



Easily distinguished from our other species by its opaque surface. 



Length .58-.62 inch. 



Abundant in the Atlantic region, where it has b :en introduced from Europe. 



T. mol it or, Linn.. Fab. El. 1, 145. 



Similar in form to the preceding. The thorax is, however, more transverse and the 

 margin broader and more distinctly reflexed. 

 Length .50— .65 inch. 

 Umndant in the same regions with obscurus. Uso introduced. 



T. castaneus, Snocb, Neue Beitr., 171 . Say, J. A.-. :'.. 266. 



Differs uotably in form and sculpture from the preceding sp scies. The thorax is here 

 nearly square, truncate at base, and more distinctly emarginate in front. The sides arc 

 more broadlj margined and the margin more refl ;xed. The surfac is more coarsely 

 punctured. The elytra are narrower and more elongate, their surface more deeply 

 striate and the stria? more strongly punctured. 



I .ength . 10 inch. 



Specimens have been found in ever) region of our country, though not abundant. 



T. tenebrioides, Beauv. Belops [ns., p. 121, pi. 30, fig. 1; Jay, Tenebrio .Tourn. Acad. 3, 236. 



Similar in form to molitor. The trochantin of the middle coxa? i- very -mall, and in 

 -nine specimens scarcelj visible. Length .4S-.52 inch. 



Abundant over our whole territorj ; specimens have occurred in California. 



Iill's. 3Ms. 

 Rhi>. Muls., Col I'ii.-I tigi lies, i>. 266. 

 B. estriatus, Lei I V.nn. Lye. 5, 149. 



Similar in form t" the European tlvoracicw, hut shorter, ami with a more distinctlj 

 margined thorax, with less prominent hind angles. Length .22 inch. 



Rare. Specimens have been found in California, and 1 I S >n, Brit. Amer. 



AMERI. PH1L080. BOO.— VOL. XIV.- --T 



