AMERICAN PHILOSOPHICAL SOCIETY. 627 



Body reddish brown, or chestnut, slightly sericeous, and with 

 minute punctures : head blackish, with an obvious, transverse, 

 raised, glabrous line over the antennae, a little advanced in the 

 middle : antennae chestnut; first joint about as long as the head, 

 somewhat robust, obliquely truncated at the end ; second hardly 

 shorter, but less robust than the third, attenuated and arcuated 

 at base, at its junction with the first joint; fourth joint a little 

 shorter than the third; remaining joints gradually a little longer 

 to the tip, subequal : thorax dusky, not elevated; dorsal line 

 hardly perceptible, even at base ; spines prominent, acute : elytra 

 rather slightly striate ; strise impunctured : beneath particularly 

 sericeous : pectus with the lateral groove well marked : tarsi, 

 penultimate joint with a short, rather broad lobe beneath. 



Length from one-fifth to three-tenths of an inch. 



[This is a species of Fornax, subsequently described by me as 

 Isarthrus spretus. The lobe of the tarsi is not very obvious ; so 

 little so, that I failed to see it in my original specimen, though it 

 is quite visible in some others in a better state of preservation 

 that I have since examined. — Lec] 



10. E. CYLINDRICOLLIS. — Black ; thorax longitudinally and 

 widely indented behind. 



Inhabits Indiana. 



Body blackish, a little 'sericeous, subcylindric, minutely punc- 

 tured : antennas dark rufous, shorter than the thorax ; first joint 

 cylindrical, hardly arcuated, at base rather abruptly narrowed, 

 at tip obliquely truncated, blackish ; second joint obconic, at- 

 tenuated and arcuated at base; third longer than the two follow- 

 ing ones together ; remaining ones to the last, subequal ; termi- 

 nal one nearly as long as the third : thorax [ 189] obscurely sub- 

 iridescent, subcylindric, the sides being almost parallel; not re- 

 markably elevated ; behind the middle a much dilated, oblong 

 triangular, rather deeply indented line, extending to the base ; 

 spines acute, not much elongated : scutel rounded at tip : elytra 

 with the stride obsolete, the subsutural obvious : pectus with the 

 lateral groove very obvious : tibiae and tarsi rufous ; penultimate 

 tarsal joint produced beneath into a dilated, obtuse lobe. 



Length less than three-tenths of an inch. 



The dilated elongate triangular indentation, or dilated dorsal 

 1836.] 



