62 NATURAL History BULLETIN. 
longer, and as long as the three preceding ones; pubescence 
long. Prothorax transverse, oval, evenly rounded, as long as 
the width of the head behind the eyes, and one-fifth wider 
than long, convex; discal fovea, or abbreviated sulcus, less 
than one-fourth of the length of the prothorax, situated just 
before the middle; transverse sulcus one-fourth from the base, 
deep, doubly arcuate, deeper in the middle, ending in a large 
lateral fovea, the enclosed basal space granulated. FZlytra 
moderately convex, just visibly broader than the prothorax 
across the high, narrow shoulders; the length of the suture is 
one-half more than that of the prothorax; basal fovez deep, 
sutural lines parallel, discal lines dilated towards the shoul- 
ders, reaching one-third from the base; sides divergent, some- 
what arcuate behind the middle. Aéddomen narrower than the 
elytra, broadly margined, with extremely short carinz on the 
bases of the first and second segments and a mere indication 
of them on the third. Legs rather strong and moderately 
short. ¢, fourth ventral with a fine, transverse line at the 
posterior margin, laterally hooked; the base of the fifth is 
transversely depressed in the middle third, and bears a trans- 
verse linear impression behind the middle; last ventral finely 
punctured, not carinate. 
Habitat. Linn County, Iowa. 
E. sPINIFER, Casey. Brown, impunctate, polished, pubes- 
cence inconspicuous. Length 1.2mm. Plate XI, Fig. 111. 
Plate AIL, Bis. r1 7: 
flead large, and, excluding the eyes, as long as wide, some- 
what quadrate, sides slightly divergent, eyes moderately prom- 
inent, tempora prominent, arcuately divergent, longer than the 
eye; base sinuate, with a median occipital impression; occipital 
fovez pubescent, moderately large, mutually two-thirds more 
distant than either from the eye, and connected by a parabolic 
sulcus, which is deeper behind the arcuate frontal ridge; the en- 
closed surface is very convex; supra-antennal tubercles strong, 
transversely and obliquely oblong. Antenne one-half longer 
than the head, robust, the first two joints stout; the joints of the 
