chamberlin: the chilopoda of brazil. 173 



proximally, paler distad. Legs more pigmented distally than proxi- 

 mally; the posterior pairs green or bluish green excepting toward 

 base. 



Head shining; pimctae weak and more or less scattered. The 

 usual two longitudinal furrows of the caudal portion, these being 

 shallow. 



i^ntennae composed of seventeen articles of which only the first 

 two are glabrous. 



Prosternal teeth 4-4 of which the outermost on each side is more 

 remote and is separated by a deeper interval than the others are from 

 each other; innermost tooth on each side smallest, the two inter- 

 mediate ones of nearly equal size. 



Dorsal plates from the fourth segment on distinctly bisulcate. 

 Only the twenty-first plate truly margined but the others of the 

 posterior half of the body especially, with submarginal longitudinal 

 furrows or depressions which simulate true margination. Plates, 

 wholly smooth and with no indication on any of a median keel. Last 

 plate more or less angularly produced, the margin bent in on each side 

 of the middle (Plate 3, fig. 2) ; with no developed sulci or pits, the 

 plate somewhat longitudinally elevated along the median line and 

 faintly depressed or furrowed along the middle of this. 



Ventral plates from second to twentieth with two longitudinal sulci 

 extending to caudal third or fourth of length where each at its end is 

 more deeply impressed. A short pit-like, median, depression in front 

 of the caudal margin and a less pronounced median depression farther 

 cephalad. Last ventral plate convex. Strongly narrowed caudad; 

 caudal margin mesally excised. With a weak median sulcus and also 

 on each side a faint fine sulcus from anterior margin to near middle 

 (Plate 3, fig. 1). 



Coxopleurae not produced, being caudally simply rounded; un- 

 armed. 



First six pairs of legs with two tarsal spines; the seventh to nine- 

 teenth with one ; twentieth legs with none. Anal legs wholly unspined, 

 being smooth throughout. 



Length 23 and 32 mm. 



Locality. — State of Amazonas: Manaos! (Mann and Baker). 



Two specimens were secured. 



This species seems to be related to 0. limbatus Meinert, but is very 

 easily separated through the differences in the spining of the tarsi as 

 indicated in the key. 



