2G 
GEO. H. HORN, M. D. 
The species known to inhabit our fauna may be separated by the 
following table. 
Elytra faintly striate at middle, the striae distinctly impressed in the basal de- 
clivity; antennae and legs piceous; surface shining, faintly aeneous. 
restrictiiliis. 
Elytra absolutely without striae ; antennae and legs pale. 
Surface moderately shining, the punctuation extremely indistinct; each ely- 
tron with an oblique yellow band at middle, not reaching the suture and 
an oval apical spot obliquatulus. 
Surface subopaque, the punctuation very distinct, especially on the thorax; 
color very variable, from yellowish testaceous to piceous, with intermediate 
maculate forms poctoralis. 
The species of this group ai’e snmll, some of the forms of pectoralis 
being the smallest Elaterides in our fauna. 
C. restrictulus Mann. — Oblong, moderately elongate and convex, piceous, 
shining, very sparsely pubescent ; antennae piceous, longer than the head and 
thorax, slender feebly serrate, joints all longer than wide ; head slightly concave, 
not closely punctate ; thorax slightly longer than wide, widest at middle, slightly 
narrowed in front, sides arcuate, sinuate in front of the hind angles, which are 
slender, acute, divergent and carinate, disc convex, finely not closely punctate, 
the median line faintly smoother ; elytra oblong oval, widest at middle, humeri 
rounded, disc moderately convex, very faintly striate near the middle, the striae 
impressed in the basal declivity, at the sides entirely obliterated, surface moder- 
ately closely punctate, except near the apex ; prosternal lobe short, mouth ex- 
posed, the sternum moderately convex, sparsely punctate at middle, more closely 
near the sides, propleurse shining, moderately closely punctate; metasternuni 
and abdomen similarly punctate, not (dosely nor coarsely ; legs piceous, the tibiae 
and tarsi sometimes paler. Length 3.5 mm. ; .14 inch. 
In the male the last ventral segment is bisinuately truncate with a 
median tooth, the same segment of the female is similarly truncate, 
but in a less pronounced manner. 
This species is described in the Monogra])h of Candeze as musculus 
Mann., but a comparison of the original descriptions will show that 
Dr. Candeze had restrictulus and not the other before him. Besides, 
a type of muscuhis is in the LeGonte collection from Mannerheim. 
The measurement given by Candeze is also incorrect foi' either spe- 
cies, while its position among the striate species is certainly mislead- 
ing. The form of the last ventral segment is not found in any other 
species in our fauna. In habitus the species resembles Oedostethns 
femoralis, but in the latter the stride are more distinctly impressed, 
although obliterated at the side, and the claws have the basal half 
dilated. 
Occurs in Alaska (Mannerheim, Ulke) and in the White Mountain 
region of New Hampshire (Blanchard). 
