26 ACADEMY OP NATURAL SCIENCES 



fourteen are above the stigmata and about fourteen below, becom- 

 ing smaller to the origin of the feet, line of the stigmata geminate, 

 anterior segment as long as the second and third conjunctly, and 

 glabrous on the anterior half, posterior segment not so long as the 

 two preceding ones united, widely rounded at tip ; head glabrovis ; 

 antennae reddish-brown : eyes triangular, granulated, deep black . 

 Not uncommon under stones, &c., and when irritated discharges 

 a lacteous globule from the lateral portion of each segment, diffu- 

 sing a strong and disagreeable odor. [105] 



5. J. MARGINATUS. — Body cylindric glabrous, blackish, seg- 

 ments with a rufous margin; ultimate segment unarmed. 



My Cabinet. 



Body cylindric, glabrous, polished, blackish, beneath pale red- 

 dish ; segments margined behind with rufous, anterior segment 

 as long as the three succeeding ones, conjunctly and entirely mar- 

 gined with rufous, second segment slightly, and obtusely angula- 

 ted at the lateral tip of the anterior one, ultimate 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 rounded : head with an impressed line which is obsolete on the 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, obsoletely dentate. 



Length more than three inches. 



A very large species inhabiting decaying wood, &c.; when ir- 

 ritated it diffuses an odor like that of muriatic acid, and is infest- 

 ed by Gamasus Juloides. It varies in color ; the margin of the 

 segments and all beneath are sometimes white, the ultimate seg- 

 ment is sometimes almost acutely angled at tip, and there is a 

 distinct 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. [106] 



Body cylindrical, immarginate, above pale, obsoletely reticu- 

 late, and varied with reddish ; a lateral series of large black 

 spots, numerous longitudinal, parallel, impressed, acute lines be- 

 neath the stigmata becoming gradually shorter to the origin of the 

 feet ; beneath whitish ; head white beneath the antennae ; antennas 

 two joints preceeding the last somewhat dilated, not attenuated 



[Vol. II. 



