CHAMBERLIN: THE CHILOPODA OF BRAZIL. 213 
side. Claw of palpus small and pale, nearly straight, with a denticle 
on mesal side toward base. 
Antennae nearly 2.4 times longer than the head. Articles moderate 
in length, decreasing very gradually distad. Ultimate article (in 
mature specimen) shorter than the two preceding taken together in 
about the ratio 3: 4, in young specimens longer than these two. 
Claws of the prehensors when closed reaching to the end of the first 
antennal segment. Claw without a true tooth within, there being, 
however, a slight low, rounded, chitinous elevation; intermediate 
joints unarmed; prefemur (femuroid) at distal end on mesal side with 
a distally rounded tooth projecting cephalomesad. 
Prosternum a little wider cephalad than caudad; 1.3 times longer 
than wide; 1.9 times as long as length of prefemur on ectal side. 
Prosternum bearing on anterior margin each side of mesal incision a 
basally broad, conical tooth. Mesal incision with sides almost parallel, 
rounded at bottom. Basal plate a little overlapped both by head and 
by first dorsal plate; twice as wide as long; ratio of width at caudal 
end to that at anterior end as 45:34; head about 4.5 times longer. 
Prescuta of posterior and median region short; those of anterior 
region very short. 
Anterior ventral plates with a deep median longitudinal sulcus on 
caudal part and ending at about middle of plate in the angle of a short 
v or u-shaped impression, the arms of which diverge cephalad. This 
median sulcus becomes gradually weaker caudad, fading out and 
disappearing near the twenty-first segment, the u-shaped impression 
disappearing farther cephalad. 
Spiracles circular, rather large; first one largest, with the third 
considerably smaller and the second intermediate, the other decreas- 
ing gradually caudad as usual. 
First pair of legs greatly reduced, being only about two thirds the 
length of the second ones and much more slender. Anterior and 
posterior pairs not sensibly differing in length or thickness. 
Last ventral plate triangular or shield-shaped, the sides being 
convex; narrowly truncate at caudal apex. 
Coxopleurae moderately enlarged; each with two large pores 
partially covered by the ventral plate and over free ventral and lateral 
surface with regularly spaced, moderately numerous, smaller pores 
but these larger and fewer than those of Mecistocephalus, etc. 
Anal legs much longer than the penult but proportionately slender. 
Hair moderate in size, subsparse. Ultimate article narrowed distad, 
terminating in an obscure membranous tip. 
