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CHAMBERLIN: THE CHILOPODA OF BRAZIL. 175 
_OTOSTIGMUS TIDIUS, sp. nov. 
Brown, of more or less ferruginous tinge caudad and also being 
darker cephalad; 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 cephalad. 
Antennae composed of seventeen articles of which the first 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 first 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 longitudinal 
sulcus of the corresponding side. Ectad of this 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. 
