Occasional Papers of the Museum of Zoology 31 



ventral corner produced ventrocephalad, rounded distally. 

 (PL 14. Fig. 92.) 



Segmental sutures sharply impressed throughout, smooth, 

 curved opposite the pore, which is less than half the distance 

 from the suture to the edge of the caudal dark band of meta- 

 zonite. Metazonite striate only beneath, but with same obscure 

 broad and very low rugae above the striae proper. 



Last tergite with caudal portion set off by a very shallow, 

 more or less obscure, transverse depression or furrow ; caudal 

 angle acute. Mesal borders of anal valves compressed and 

 elevated, the elevated region of only moderate height. Anal 

 scale sharply set off ; each side concave, the caudal angle rec- 

 tangular or a little obtuse. (PL 14, Fig. 94.) 



Gonopods of male as shown in PL 14, Figs. 95, 96. 



X umber of segments, 54 to 55. 



Length, about qo mm. ; width, 6.5 mm. 



British Guiana : First ]\lourie. In Calladium root masses 

 in tree clump. Aug. i and 5, 1914; F. AL Gaige. Two females. 



Labba Creek Sand Hills; July 27, 1914. One female. 



Forested Sand Liills ; Aug. 18, 1914; F. M. Gaige. One 

 male in Calladium root mass. 



Hdlotype, Al. C. Z., 5.098. 



Orthoporus walkeri, sp. nov. 

 PI. 14. Fig. 97; PI. 15- Fig. 98 



Somewhat resembling the preceding species, 0. ctholax, 

 but readily distinguished by difference in color pattern as well 

 as in details of structure. Unlike ctholax, this species has a 

 caudal band of each typical segment lightest, sub ferruginous 

 in color with the anterior portion of metazonite, embracing 

 more than half of it, deep brown of olive cast. Last tergite, 



