chamberlin: the chilopoda of brazil. 199 



First maxillae of usual structure; outer branch robust, without 

 lappets. 



Claw of palpus of second maxillae long, distally slender and acute 

 and strongly curved; pectinate along both edges, the di\nsions long 

 and slender. 



Antennae moderately long, being three and a fifth times as long as 

 the cephalic plate, only a little attenuated distad. Articles of proxi- 

 mal portion moderately long, each somewhat clavately widening from 

 proximal and distad; the five articles preceding the ultimate short 

 and relatively wider. Hairs of the last six or seven articles very short 

 and rather numerous, on the more proximal articles becoming much 

 more sparse and manifestly longer. 



Prebasal plate exposed. 



Basal plate trapeziform, the sides convex. About one third as long 

 as the cephalic plate and 2.4-2.5 times wider than long. 



Claws of the prehensors when closed not fully attaining the front 

 margin of the head. Claws smooth. All articles unarmed within as 

 usual. 



Prosternum with sides for most of length nearly straight, a little 

 converging caudad, more abruptly rounding mesad at posterior 

 corners. Anterior margin well chitinized; but not at all denticulate; 

 mesal incision between lateral portions shallow, semicircular; sloping 

 from each side to the middle, there forming an obtuse reentrant angle. 

 Prosternum much wider than long, the ratio being about 25 : 18; longer 

 than the outer length of femur in about ratio 3:2. Hairs of pre- 

 hensors sparse and in part moderately long; those of prosternum very 

 sparse and short. (Plate 4, fig. 2). 



Prescuta of the anterior and of the posterior fourths of length short, 

 the others being moderately long. Sulci sharply impressed. 



Spiracles all circular; the first conspicuously larger than the second, 

 the others decreasing in size caudad and becoming very small or 

 minute in the posterior region. 



The more anterior sternites with a rather narrow angular median 

 caudal process which fits into a corresponding excavation in the 

 succeeding sternite. Each with a subcruciform impression which is 

 considerably expanded in the region where the furrows cross. Pores 

 beginning on the second segment where there are from forty to forty- 

 five in the type; pores present on all succeeding sternites excepting 

 the last, those of the penult segment being fewer in number; pores 

 arranged in an undivided circular area. 



Last ventral plate wide, trapeziform, the sides being nearly straight 



