ch.vmberlin: the chilopoda of brazil. 175 



Otostigmus tidius, sp. nov. 







Brown, of more or less ferruginous tinge caudad and also being 

 darker ceplialad; plates mostly darker along caudal edges. Antennae 

 very dark. 



Head finely densely punctate. With no true sulci; but on the 

 anterior portion an unusually deep median longitudinal furrow and 

 also a similar one caudad of the middle with on each side of the latter 

 a short, more shallow, furrow diverging from it ceplialad. 



Antennae composed of seventeen articles of which the fu"st two are 

 glabrous. 



Prosternal teeth 4+4; the three innermost on each side nearly on 

 a level and about equal in size, but the most ectal one situated more 

 proximad, being at about the middle of lateral edge of dental plate. 

 Process of fu-st joint of prehensors notched or toothed on mesal side 

 below apex. (Plate 2, fig. 6). 



All dorsal plates with a distinct median longitudinal furrow, on 

 each side of which, in most of the plates, there is a double longitudinal 

 ridge between the two edges or keels of which lies the longitudmal 

 sulcus of the corresponding side. Ectad of tliis double keel there 

 is a much lower, often indistinct, keel. Plates longitudinally deeply 

 fluted or furrowed along each lateral nargin, producing the appearance 

 of margination; but only the twenty-first plate truly margined. The 

 keels are not well indicated on the first three or four plates. The 

 median sulci are distinct from the fourth or fifth plates caudad. Last 

 plate with caudal edge moderately bowed caudad. The median 

 furrow distinct. An elevation or ridge each side of the middle divided 

 by a weak furrow corresponding to that on the more anterior plates. 

 (Plate 2, fig. 7). 



Ventral plates with indications of the longitudinal sulci over the 

 anterior portion, but the traces very short. Without any distinct 

 pits or similar depressions. Last ventral plate strongly narrowed 

 caudad. Caudally convexly rounded, not at all mesally incurved. 

 A rather fine median longitudinal furrow^ present. (Plate 2, fig. 8). 



Coxopleurae without true processes; but a little extended caudad, 

 the corner being well rounded. 



The first to the eighteenth pairs of legs with two tarsal spines, but 

 the lateral spine on the eighteenth minute and that of the seven- 

 teenth intermediate in size. Nineteenth and twentieth legs with but 

 a single tarsal spine. 



