Occasional Papers of the Museum of Zoology 8i 



tions; caudal excavation of keel and the tubercle of segment 

 as in the second. In the fourth and succeeding keels there is 

 no excavation on the caudal side, the anterior border being 

 bent dow^n so as to bend beneath the preceding keel as a whole 

 instead of fitting into a furrow and notch. Fourth keels with 

 four crenations on lateral margin, the following ones with six. 

 Tubercles in general as described for the second segment, 

 excepting that typically only one tubercle is distinct at the bend 

 in the keel. 



Penult tergite widely overlapping the last segment, the keels 

 meeting behind, or separated only by a narrow incision; caudal 

 end of each keel rounded, four crenations between the rounded 

 caudal end and the widely rounded anterior corner; dorsum 

 convexly elevated above the keels, which are pale in color 

 throughout, and bearing two transverse rows of tulDercles, six 

 in each row. The keels curve down marginally all the way 

 around. (PI. 30, Fig. 214.) 



Anal segment with cauda short and rather narrow, distally 

 rounded. Valves a little convex, mesally margined. (PI. 30, 

 Fig. 215.) Scale subtrapeziform. (See PI. 30, Fig. 215.) 



Gonopods of male with coxae, completely concealing the 

 telopodites when in situ. See further PL 30, Figs. 216 and 217. 



Length, 8 mm.; width, 1.2 mm. 



British Guiana: First ^Nlourie. Aug. 26, 1914; F. M. 

 Gaige. A male and a female collected under fallen leaves in 

 a tree clump. Holotype. M. C. Z., 5,187. 



