334 REVISION OF THE TENEBRIONIDvE OF AMERICA, 



IPHTHIMUS, Truqui. 

 Iphthinius, Triiqui, Stettin Ent. Zeitschrifl 1877, p. DO. 



The species of this genus are more depressed than those of any other in the sub-tribe 

 excepting Scotobaenus. From our other genera with entire epipleurae this may be easily 

 distinguished (from Polypleurus) by the epipleura becoming very narrow behind, and 

 (from Nyctobates) by the thorax narrowing behind and becoming crenulate on the sides. 

 The mentum has no lateral lobes. 



Two species are found in our fauna, one from New England and Canada, the other 

 W estern, ranging from New Mexico to Oregon and northern California. 



I. o.pacus, Lee, New Species, 121. 



Differs from the following in its smaller size, move robust form, as well as by its entire 

 absence of any lustre and by its very rugose sculpture. The thorax and head are very 

 coarsely and continently punctured. The former is less narrowed behind than in the next 

 species, the sides less rounded and more strongly crenulate. The anterior angles arc also 

 more prominent. The elytra! sculpture consists of deep stria:' frequently interrupted, 

 forming thus series of short dashes, of which the interspaces are convex. 



Length .60-.80 inch. 



Occurs not uncommonly in New England and Canada. 



I. serratus, Mann., Nyctohaten Hull. Mosc. 1843, p. 234. Leo., Pacif. R. R. Rep. IX. A.pp. 1, pi. 2. fig. 5. 

 I.. i. -.Mil. Tphthi ims Genera, Vol. V.. p. 371, note. 



This species is larger than the preceding, and differs in the characters given above, 

 and while these are apparently of but small moment, the appearances of the two species 

 are so different that one cannot he mistaken for the other. This species is distributed 

 over a large region of country, and suffers some variation in each, so that three types or 

 races mav he distinguished as follows: 



seriait U ■-. Lee. 



This is tlie more opaque and rugose form. The head and thorax are both coarsely and 

 densely hut not confluently punctured. The elytra are sculptured with series of inter- 

 rupted striae, of which the interstices are flat and densely punctured. This form occurs 

 abundantly in Oregon and British Columbia. The forms described as Iplhinus sewiUs, 

 wvator, and eubligatus by Walker, in "The Naturalist in British Columbia." Vol. II, 

 pp. 326 and 327, are probably merely individual variations of this one form. 



Length .68-.96 inch. 



sublsevis, Lee, List, ^Nyctobates Bland, Proc. Ent. Soc. 



Differs from the preceding in its smoother sculpture. The head and thorax are mod- 

 erately smooth, being rather finely and sparsely punctured. The elytra are sculptured 



