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. 



