348 REVISION OF Till: TEKEBRIOXIDjE of IHERICA. 



The male is smaller and more slender than the female. The outline of this sp 'cies is 

 almost exactlj that of Himatismus occidentalis, as figured by Lacordaire (Genera, pi. I!'. 

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



This insect occurs rather abuudantly in Owens" V"alley, California, flics at night, and 

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



TRIBE \\1 — PEDININI. 



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

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

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

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

 middle coxa; with distinct trochantin; anterior tarsi of male dilated and spongj beneath, 

 hind tarsi either pubescent or spinous. 



The anterior coxa' arc 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. 



( )ur genera form two groups : 



Eyes not entirely divided. p] \ tyxoti. 



Eyes completely divided. blapstini. 



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

 assigned a place. It tnaj possibly be a larger species ofBlapstinus 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, Latr. 

 Ri ne Animal, ed. .. Y. p. 10. 



0. QOtus, Say, Opatrum Journ, Acad. 5, 837; Bost. Journ. 1, is?. Lee, Opatrinus Say's Ent. II. 804; 

 '/'■ »< •- Beauv. [ns. 108, pi. 31, fig. 7. 



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

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

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

 feebly rounded and with the margin slightly thickened. 



Occurs abundantly in the whole Atlantic district. 



Length .32-. H inch. 



