AMERICAN COLEOPTERA. 133 



ACANTHOCINUS Steph. 

 A. obsoletus Oliv. (Lamia), Ent. iv, 67, p. 130, pi. 13, fig. 90; Lee. (Aedilis), loc. 



cit. p. 174, (quoted in Graphisurus in Catalogus p. 3160). 

 A. obliquus Lee. (Aedilis), Proc. Acad. 1862, p. 39. 

 A. speotabilis Lee. (Aedilis), Pr. Ac. 1854, p. 82; Col. Ks. 1859, p. 22, pi. 2, fig. 16. 



p7-inceps Walker, (Eutrypanus), Nat. in Vane. 1866, ii, p. 331. 

 A. nodosus Fab. (Lamia), Syst. Ent. p. 164; 01. Ent. iv, 67, p. 75, pi. 14, fig. 103 ; 

 Lee. (Aedilis), Journ. Acad. 1852, p. 174. 

 bifidaior 9 Fab. Syst. El. ii, p. 286. f 



fElIE Newra. 



O. St»angiilata u. sp. — Piceous, subopaque, pubescence very short and 

 inconspicuous. Head densely punctured, thorax a little wider than long, sides 

 divergent from the apex, and at apical fourth suddenly tubularly constricted, 

 the angles in front of constriction broadly rounded, disc feebly convex, a very 

 short median line in front terminating in a transverse impression in front of 

 the middle which is limited behind by a transverse plica, surface densely punc- 

 tured. Elytra not wider than the thorax, surface with three feebly elevated 

 lines on each and densely finely punctured. Body beneath moderately densely 

 punctured. Length .76 inch ; 19 mm. (PI. II, fig. 7). 



The specimen before me is a male, the antennae are a little longer 

 than the body, the scape is moderately stout and finely tuberculate, 

 joints 3 — 6 are armed beneath with small acute spines although very 

 small on the sixth joint. The abdomen is very small and much re- 

 tracted, the last segment broadly emarginate. 



One specimen, Parowan, Utah; Dr. Edward Palmer. 



The thoracic sculpture, as well as its form, distinguishes the species 

 of ffime, as follows : 



0. RiGiDA Say, has the thorax densely punctured, a moderately 

 impressed median line. 



0. COSTATA Lee, has the thorax punctured and with a smooth 

 median vitta. 



0. STRANGULATA Horn, has the thorax vei-y much more suddenly 

 constricted, and a transverse impression and plica on the disc. 



^THECERrS Chev. 



The type of this genus is the species described by me as Arhopalus 

 Wilsonii, (Proc. Acad. 1860, p. 570, pi. viii, fig. 4), to which Lacor- 

 daire (Genera ix, p. 18-4), has added a second, while a third remains 

 to be described. They are as follows : 



Thorax broader than long, elytra truncate at tip. 



Elytra feebly shining, the punctures near the apex not densely placed. 



Thorax not maculate IVilsoilii Horn. 



Elytra opaque, punctures near the apex very fine and very densely placed. 



Thorax with two discal black spots Hoi'uii Lac. 



Thorax as long as broad, elytra rounded at tip lateciuctus n. sp. 



