chamberlin: the ciiilopoda of brazil. 207 



Dorsal plates with a pair of longitudinal deeply impressed sulci on 

 the middle portion and an additional longitudinal sulcus farther 

 laterad on each side less sharply impressed; indications on some 

 segments also of a shallow median longitudinal median furrow. First 

 dorsal plate considerably wider than the second and at its ends bent 

 ventrad toward the base of each leg and crenately incised on the 

 caudal side near each corner (Plate 5, fig. 4). ' 



Spiracles large; all elliptic, the anterior ones being oblique but more 

 nearly horizontal than vertical, becoming strictly longitudinal caudad; 

 first spiracle not larger than the second; those of the caudal region 

 smaller as usual. Suprascutella large and distinct in the posterior 

 region but absent in the anterior. 



Ventral pores in two broad transverse bands connected at the ends 

 and thus forming a quadrangle. Enclosed area mostly with a distinct 

 transverse furrow or row of impressed spots or the whole area rough- 

 ened with irregular impressions, in most more deeply impressed 

 longitudinally at middle. 



Last ventral plate pentagonal, the sides strongly converging 

 caudad and the caudal margin straight. Marked with a longitudinal 

 median furrow which is not especially deep. 



Coxopleurae rather large, coxiform; longer than thick in the direc- 

 tion of thinnest diameter; the trochanter only about one third as long. 



Anal legs in male considerably shorter than the penult; composed 

 of six articles ^ which decrease in diameter regularly from base distad. 

 Pairs of legs 77. 



Length 88 mm.; length of antennae, 2.2 mm.; greatest width of 

 body, 3.3 mm.; width of first dorsal plate L9 mm. 



Locality. — State of Rio Grande do Norte: Natal! (Mann). 



While this species is close in many features to brrvilabiatus, it is very 

 easily separated from this wide-spread form. It is most readily dis- 

 tinguished by the antennae which are much shorter, extending only to 

 the caudal end of the basal plate or thereabouts, whereas in brevilabia- 

 tus they reach upon or toward the caudal end of the second pediferous 

 segment; also the antennae are conspicuously wider at the base and 

 more strongly attenuated (Plate 5, fig. 4). The dorsal plate of the 

 first segment is clearly different, being bent farther ventrad of ends 

 and being more considerably notched on caudal side toward each 

 caudolateral corner. It lacks the conspicuous geminate dorsal black 

 stripe so characteristic of brevilabiatus. 



1 The right leg of the type specimen appears to have been regenerated. It is 

 shorter than the other and consists of but Ave articles. 



