36 NATuRAL History BULLETIN. 
tured. A/ytra, across the rounded shoulders, as wide as the 
prothorax, before the tip one-third wider and the suture one- 
fourth longer; disk convex, base with two arcuate impres- 
sions, leaving between them a broad longitudinal ridge, which 
in proper light may be traced to one-third the elytral length. 
Abdomen with the first segment not longer than the second, 
very convex with two very short basal carine. Legs moder- 
ate, the intermediate thighs lunate, convex anteriorly and 
nearly straight posteriorly, compressed. ‘The abundant pube- 
scence makes the surface appear lustreless. 
Habitat. Illinois, Iowa. On moist rotten wood with ants. 
Abundant in the time of copulation in June. Differs from 7. 
puncticolle by the impression on the occiput and the presence 
of abdominal carine. 
T. pARVULUM, Lec. Yellow, polished throughout, pubes- 
cence not perceptible except under a magnifying power of 
over sixty diameters. Length,1.0oomm. Plate XI., Fig. 97. 
flead one-fifth wider than long, tempora prominent, angu- 
larly rounded, transverse behind, eyes not prominent, frontal 
tubercles strong, intermediate margin very nearly straight but 
slightly wavy; lateral margin straight from the tempora to 
the frontal margin; in a line through the middle of the eyes 
are two deep fovee, three times as distant from one another 
as from the eyes; circumambient sulcus deep, transverse in 
front; occiput convex, impressed in the middle at the base. 
Antenne with the two basal joints stout, three times as wide 
as the third; third to eighth moniliform, very small; ninth and 
tenth rapidly increasing in width, not longer; last, twice as 
wide as the tenth, ovate-conical, not acuminate. Palpiz with 
the last joint thick, unsymmetrical. Prothorax as long as 
wide, the width equal to that of the head; sulcus double, deep; 
sides arcuate one-fourth from the base, where they are slightly 
sinuate, otherwise nearly spherical. /lytra with the discal 
line extending one-half the length; base of abdomen bicarinate. 
Legs not compressed, intermediate thighs regular. 
Habitat. Illinois, Iowa. 
