36 Natural History Bulletin. 



tured. Elytra^ 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. 

 Addomen with the first segment not longer than the second, 

 very convex with two very short basal carinas. 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 T'. 

 ■puncticolle by the impression on the occiput and the presence 

 of abdominal carinas. 



T. PARVULUM, Lee. Yellow, polished throughout, pubes- 

 cence not perceptible except under a magnifying power of 

 over sixty diameters. Length, i.oo mm. Plate XL, Fig. 97. 



Head 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 foveas, 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. 

 AnteuHCB 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. Palpi 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. Elytra with the discal 

 line extending one-half the length; base of abdomen bicarinate. 

 Legs not compressed, intermediate thighs regular. 



Habitat. Illinois, Iowa. 



