6 University of Michigan 



low. Head and tergites densely clothed with moderately short 

 hairs of uniform length. 



The head suhglobose, abruptly rounding in to the base of 

 the beak. Beak moderately short, its end about on a level 

 with distal end of the fourth antennal article ; essentially 

 straight, being only very vaguely curved ; hairs along sides all 

 short, but with many long hairs beneath. (PI. i. Fig. 6; PI. 

 2. Fig. 9.) 



Collum viewed from above trapeziform in outline, the ante- 

 rior margin mesally incurved, as usual. 



The pleurites of anterior segments with cephalomesal angle 

 rounded ; the outer portion of anterior margin produced for- 

 ward and presenting two low, angular teeth, of which the 

 mesal one is the more acute ; posterior margin widely convex. 

 (See PI. I, Fig. 7.) Posterior pleurite as shown in PI. i. 

 Fig. 8. 



Gonopods of male as shown in PI. 2, Figs. 12-15. 



For legs of male, see PI. 2, Figs. 10, ii. 



Number of segments, 82 to 115. 



Length, to 40 mm. ; width, to 1.8 mm. Body typically deep, 

 sometimes nearly cylindrical. 



Colombia: Fundacion ; Aug. 7, 1913; A. S. Pearse. Holo- 

 type, jM. C. Z., 5,048. Sixteen specimens collected under and 

 in rotten logs in forest. "Shoot out threads of slime when 

 handled, after the manner of Peripatus." The males have a 

 lower number of segments (82-92) and are in general smaller 

 than the females. 



This species approaches S. gracilicurnis Carl, which is also 

 a Colombian species, in form of head, pleurites, etc., but is 

 readily distinguished by the details of the male gonopods. 



