160 
Psyche 
[December 
in most Monof eronia ; outer basal stria of pronotum either 
obliterated or very weak; elytral striae deep, only rarely 
with even the slightest trace of punctulation ; elytral inter- 
vals definitely convex even at apex; the last ventral of $ 
with a large, subapical, transverse impression which is 
bounded anteriorly by a pronounced transverse ridge. 
Length 10.7-14 mm. Width 4. 0-5.0 mm. 
Range at least from the lower slopes of the White Moun- 
tains of New Hampshire to Virginia (Pennington Gap) 
and possibly to North Carolina (1 $ from Linville, doubt- 
fully determined), and west (teste Casey 1924, p. 78) to 
Priest Lake, Idaho. Common in some localities. 
There seems to be no doubt that Chaudoir’s Feronia 
(Evarthrus) diligenda is a species of Monof eronia, and I am 
reasonably sure that it is the present species, in spite of 
Chaudoir’s later opinion ( cf . Horn 1892, p. 41) that the 
name is a synonym of mancus Lee. Mancus and the pres- 
ent species, like all Monoferonia, resemble each other so 
closely, especially in the absence of males, that Chaudoir 
might easily have considered them identical, even upon a 
comparison of specimens, and we do not even know that 
he had an opportunity for direct comparison. Setting aside 
Chaudoir’s later opinion as of no certain value, then, we 
have the following statements in the original description 
of diligenda which, in combination, I think can refer only 
to the present species : the basal angles of the prothorax 
are obtuse, with the apices rounded; the inner basal fovea 
of the pronotum is recurved along the base and the lateral 
margin, where it is obliterated (this description fits some 
of my specimens but not others) ; the elytral striae are 
smooth and deep through their entire length; and, most 
significant of all, the $ last ventral has a transverse oval 
impression near the posterior margin. The species under 
discussion is the only Monoferonia known to me to which 
this last statement really applies. Casey (1918, p. 363) 
points out that Chaudoir mentions a depression on the $ 
last ventral but not a more anterior transverse ridge, and 
evidently concludes that the ridge would have been men- 
tioned if it had been present and that since it is not men- 
