252 Annals Entomological Society of America [Vol. Ill, 



Polydesmus socarnius sjj. nov. 



Dorsum bnjwn; the carinac commonly paler; a median lon^ntu- 

 dinal dark line indicated in some, this more distinct caudad. Venter 

 scarcely paler than dorsum. Legs yellow or light brown. Head brown, 

 the genae and the clyijcal and labial region paler, yellowish. Antennae 

 brown, darker than the legs, but light distally. 



Vertex of head crossed by the usual median longitudinal impressed 

 line, this line extending to the angle between two furrow-like impres- 

 sions which extend from the median ventro-laterad to the bases of the 

 antennae. Head conspicuoush' longitudinall>- furrowed along each side 

 in line with the antenna, the latter being inserted in the furrow. Some- 

 what finely rugose over vertex. Moderately pubescent with rather 

 short hairs. 



Antennae a little longer than the width of the body, clavate to the 

 sixth joint, seventh article comparatively large, showing the usual 

 sense cones distinctly. Clothed densely with mostly short hairs. 



First segment wider than the head without the genae but dis- 

 tinctly narrower than the head inclusive of the genae and than the 

 second segment. Transversely somewhat elliptical; the cephalic mar- 

 gin widely and but weakly convex; cephalo-lateral angles strongly 

 rounded, the margin evenly curving to the middle of the lateral carinal 

 edge where it ends on each side in the single obtusely angular tooth. 

 Caudo-lateral comers of the carina sub-rectangular, the caudal margin 

 of the carina being nearly straight, untoothed. A row of four contig- 

 uous tubercles adjacent to the caudal margin along its median portion. 

 The median convex area of segment with tubercles weakly or but 

 obscurely indicated. 



Second segment bent cei)hala(l laterally as usual; overla])]:ed by the 

 first plate. Lateral carinal margin with three strongly develo]:ed teeth 

 of which the cc])halic is most acute and of which the most jjosterior is 

 at or but little caudad of the middle of the margin, the latter caudad of 

 this tooth being straight or but little curved to the sub-rectangular 

 caudo-lateral angle. Posterior edge of carina straight and untoothed. 

 Three rows of tubercles which are not closely placed, the two first rows 

 extending from carina to carina; the row along the caudal border con- 

 sisting of six elongate and roundly conical tubercles, which ])roject a 

 little beyond the caudal margin and are widely separated from each other, 

 the two more mcflian ones being closer to each other than are any other 

 two. 



In the following segments a fourth tooth, at first ventral in ])osi- 

 tion, occurs between the caudal angle and the median tooth of the 

 carinal margin. The caudo-lateral angle becomes gradually more and 

 more acute and extended caudad, on most of the segments being conspic- 

 uouslv produced. Most of the segments tyjiieally with a narrow longi- 

 Uulinal furrow adjacent to the carinal margin, a little mesad of this 

 with a wider and deeper furrow and again a little farther mesad a sec- 

 ond narrow furrow, there being between the large and more evident fur- 

 row and the narrower one each side of it a carina-like elevation which 



