chamberlin: the chilopoda of brazil. 167 



Antennae short, composed of sixteen (mostly) or seventeen articles. 

 None of the articles glabrous but the first two more sparsely clothed 

 with hair than the others, the density increasing from the second to 

 the fourth and thereafter essentially uniform. 



Anterior margin of prosternum considerably more elevated ectally 

 than mesally; l^earing two wide but very short dental plates which 

 are weakly convex. 



First dorsal plate with a strictly semicircular cervical sulcus which 

 is entirely free from the head and at its middle nearlv one third the 

 distance from the head to the caudal margin of the plate. Median 

 longitudinal sulci distinct, subparallel, crossing the transverse sulcus 

 and attaining the front margin. 



Second dorsal plate with the median longitudinal sulci appearing 

 as very short lines at caudal border, each line being continuous with a 

 sulcus extending a little cephalad of directly ectad to the lateral 

 margin and with a very short line extending mesocephalad. The 

 median longitudinal sulci are complete on the other plates. The 

 third plate shows a rather wide and shallow median longitudinal 

 furrow. Subsequent plates with a distinct narrow median longi- 

 tudinal keel set off by two deep furrows. Plates from fifth caudad 

 with a distinct longitudinal furrow on each side with also less distinct 

 indications of similar ones on the third and fourth. 



Last dorsal plate bowed considerably caudad, the protruding mesal 

 portion truncate. Without a median sulcus or with but weak trace 

 of such toward caudal end. 



Ventral plates from the second to the penult with a strongly marked 

 median longitudinal furrow which is continuous from the anterior 

 margin to a little in front of the caudal border. Lateral sulci extend- 

 ing from anterior margin to caudal portion of plate, converging with 

 each lateral margin. Not distinctly punctate. 



Last ventral plate considerably wider than long; narrowed caudad; 

 posterior corners well rounded; caudal margin widely though but 

 moderately convex, slightly crenately notched each side of the middle. 



Spiracles moderate; mostly elliptical, being obliquely or rather more 

 dorsoventrally compressed. 



Coxopleural processes long and straight; ending in a single slender 

 and acute spine; process with but scattered short hairs. 



Prefemur of anal legs armed ventrally with a series of six large 

 spines and, in addition, on mesal surface with about eighteen spinules 

 arranged in four longitudinal series. Femur armed ventrally with two 

 spinules on proximal half and in a longitudinal line. Other joints 



