Occasional Papers of the Museum of Zoology 25 



PI. 13, Fig. 85, this furrow less marked and sometimes obscure 

 in young specimens. 



A larger species with the number of segments 65 as 

 against 55. 



Length, about 70 mm. ; width, 4.5 mm. 



British Guiana : Forested Sand Hills. In rotten wood. 

 Aug. 17, 1914 ; F. M. Gaige. Two adult and five partly grown 

 females. 



Sand Hill Forest ; Aug. 22 and 24, 1914. Three females 

 "in Calladium root masses." 



Labba Creek Sand Hills. July 27, 1914. Two females. 



First Mourie; July 31, 1914. In humus of tree trunk. 

 Two specimens. 



Second Mourie; Aug. 19, 1914. In sand. One female. 



Sand Hill Forest; Aug. 19, 1914. Two females. 



Holotype, ^L. C. Z., 5,081. 



Nanostreptus gracilior, sp. nov. 



PI. 13. Figs. 86, 87 



A female apparently pertaining to this genus is a smaller 

 and more slender form than those of the preceding species. 

 It differs decidedly in not having the collum at all truly angled 

 beneath, the lower margin on each side being straight as in the 

 Colombian iY. inconstans Carl, the corner rounded, the ante- 

 rior one lower than the posterior. Three or four stories on 

 each side as shown in PI. 13, Fig. 86. 



The lower edge of cardo of mandibles only very slightly 

 incurved (PI. 13, Fig. 86). Ocelli in type 41, in six series; 

 thus, 9, 9, 8, 7, 5, 3. 



Segmental suture deep and smooth, weakly excurved oppo- 



