334 



REVISION OF THE TENEBUIONIOeE OF AMERICA, 



IPHTHIMTJS, Truqui. 

 Iphtliimus, Truqui, Stettin Ent. Zeitsohrift 18)7, p. 93. 



The species of this genus are move depressed than those; of any ether in the sub-tribe 

 excepting Scotobcenus. From our other genera with entire epipleuree this may be easily 

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

 (from Nyctohates) 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 

 Western, ranging from New Mexico to Oregon and northern California. 



I. opacus, Lee, Now Species, 121. 



Differs from the following in its smaller size, more 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 are also 

 more prominent. The elytral sculpture consists of deep striae 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., {Nyetobates) Bull. Masc. 1848, p. 234. Lee., P.iciC R. R. Rep, IX, A.pp. 1, pi. 2, fig. 5. 

 Lacord. (Iphthimui) Genera, Vol. V., p. 871, 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 

 arc so different that one cannot be 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 may be distinguished as follows : 



ee i' rat us, Lee. 



Tins is the more opaque and rugose form. The head and thorax are both coarsely and 

 densely but not continently punctured. The elytra are sculptured with series of inter- 

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

 abundantly in Oregon and British Columbia. The forms described as Ijpthinus serviUs, 

 serveUor, and mhlitfatus .by Walker, in "The Naturalist in British Columbia," Vol.11, 

 pp. 32(> and 327, arc probably merely individual variations of this one form. 



Length .G8-.96 inch. 



subliDvis, Lee,, List, (Nyctobatcs) Bland, Proo. Ent. Soc. 



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

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



