348 



REVISION OF TIIK TENEBRIONIDJE OF AMERICA, 



The male is smaller and more slender than the female. The outline of this species is 

 almost exactly that of Himatismus occidentalis, as figured by Lacordaire (Genera, pi. 49, 

 fig. 1,) excepting that this insect has the thorax shorter, with the anterior angles rounded. 



This insect occurs rather abundantly in Owens' Valley, California, flies at night, and 

 is attracted by candle light. When recent it is somewhat paler in color. 





TKIliE XXI— PEDININI. 



/ 



This tribe differs from those which precede, in having the front very short and broadly 

 dilated on the sides. The body is usually short, oval, not very convex, opistoma, emargi- 

 nate, sometimes very deeply, allowing the basal membrane .to become visible; labrum 

 prominent; mentum small, frequently trilobcd in front, with a distinct gular peduncle ; 

 middle COXE8 with distinct trochantin ; anterior tarsi of male dilated and spongy beneath, 

 hind tarsi either pubescent or spinous. 



The anterior coxae are more transverse than in the preceding tribes and tend toward 

 the sub-cylindrical form so strongly marked in most of the genera, of the Ulomini. The 

 head is usually deeply inserted, and the terminal joints of both pairs of palpi either trian- 

 gular or securiform. 



Our genera form two groups : 



Eyes not entirely divided. PLATYNOTI. 



Eyes completely divided. blapstin'i. 



One species, described by Say as Pedinus suturalis, remains unknown and cannot be 

 assigned a place. It may possibly be a larger species of Blapstinus or Opatrinus. 



GROUP I — PLATYNOTI. 



One genus alone in our fauna, constitutes our representation of this group. From our 

 other genera, it may be easily known, by the eyes not being divided and the anterior 

 tibiae slender and not notably different in the sexes. 



OPATRINUS, Lair. 

 Regne Animal, ed. 2, V. p. 10. 



O. notns, Say, (Opatrum) Journ. Acad. 5, 287; Boat. Joum. 1, 187. Leo., (Opatrinus) Say's Ent. TI, 304; 

 Tenebrio minimus, Beauv. Ins. lfl.'!, pi. 31, fig. 7. 



The elytral sculpture' of this species consists of rows of large punctures, usually round, 

 sometimes more or less elongate. There arc no stria 1 , and the rows of punctures are at 

 times interrupted. The sides of the thorax arc gradually convergent anteriorly, very 

 feebly rounded and with the margin slightly thickened. 



Occurs abundantly in the whole Atlantic district. 



Length .32-41 inch. 



