20 University of Michigan 



Colkim inflexed at ends below. Strongly narrowed ventrad, 

 the ends narrow, rounded. Typically with six longitudinal or 

 sublongitudinal striae on each side of which the two upper- 

 most are longer and more oblique than the others ; striae end- 

 ing in a vertical margining stria along anterior border extend- 

 ing part way to middorsal line. (See PI. ii, Fig. 71.) 



Segments in general not truly constricted, but with suture 

 very distinct throughout, smooth ; pore contiguous with suture, 

 the latter on some a little angularly bent at its level. Meta- 

 zonites striate below, the segments otherwise wholly smooth 

 and shining. 



Anal tergite caudally rounded ; surpassed by the valves. 

 Anal valves narrowly but sharply margined. 



Number of segments, 67 to 73. 



Length, about 42 mm. ; width, 2.2 mm. 



British Guiana: Second Alourie; Aug. 19, 1914; F. M. 

 Gaige. Two females in sand. 



Forested Sand Hills. "Tn rotten wood and in the earth." 

 Aug. 17, 1914; F. M. Gaige. One female. 



Also, Aug. 14, 1914. One female in sandy soil of forest 

 f^oor. 



Labba Creek Sand Hills ; July 27, 1914 ; F. M. Gaige. lisree 

 females collected in sandy soil of the forest floor. 



Sand Hill Forest; Aug. 22, 1914; F. M. Gaige. A female 

 taken in Calladium root mass. 



Holotype, ISl. C. Z., 5,072. 



SlMKOSTRI.I'TIIlAi: 



The following artificial key will aid in separating the spe- 

 cies of the family described in this paper. It is ba<;cd pri- 

 marily upon the females. 



