OF THE UNITED STATES. 105 



.7. J. *marginatus. Body cylindric glabrous, 

 blackish, segments with a rufous margin ; ultimate 

 segment unarmed. 



My Cabinet. 



Body cylindric, glabrous, polished, blackish, be- 

 neath pale reddish ; segments margined behind with 

 rufous, anterior segment as long as the three 

 succeeding ones conjunctly and entirely margined 

 with rufous, second segment slightly, and obtusely 

 angulated at the lateral tip of the anterior one, ulti- 

 mate segment as long as the two preceding ones united 

 narrowed to the tip which is rounded ; head with an 

 impressed line which is obsolete on the front ; labrum 

 pale, deeply and widely emarginated at the tip, with 

 a submarginal, infracted series of ten or twelve 

 punctures furnishing hairs, tip ciliated, reddish, ob- 

 soletely dentate. 



Length more than three inches. 



A very large species inhabiting decaying wood, &c„ 

 when irritated it diffuses an odor like, that of muriatic 

 acid, and is infested by Gamasus Juloides. It varies ■ 

 in colour; the margin of the segments and all beneath 

 are sometimes white, toe ultimate segment is some- 

 times almost acutelj angled at tip, and there is a dis- 

 tinct lateral series of black dots. 



6. J. *pusillus. Body with a lateral series of 

 black spots, terminal segment unarmed. 

 Inhabits the middle States. 

 My Cabinet, 



14. 



