Occasional Papers of the Museum of Zoology 23 



The first maxillae seem quite distinctive in that the inner 

 branch on each side is much thicker than the outer branch, with 

 the distal end broad and rounded, whereas the slender outer 

 branch is distally acuminate. 



In the second maxillae the pleurosternal suture is clearly 

 marked. The claw of the palpi long, completely pectinate. 



For prehensors see Plate IV, Fig. 20. 



Ventral pores on all sternites from the first to the penult 

 inclusive, the area circular and all undivided. 



Last ventral plate narrowed conspicuously caudad; caudal 

 margin incurved. 



Pores of last coxae two on each side, large and simple as usual. 



Pairs of legs, forty-nine. 



Length, about 12 mm. 



British Guiana, Dunoon: clay jungle, by first landing on 

 Labba Creek, one specimen taken under a log, August 12, 1914, 

 F. M. Gaige. Type, M.C.Z., 2183. 



Apparently nearest to S. tropicus Brolemann and Ribaut of 

 French Guiana. It differs in having all ventral pore areas undi- 

 vided, in the much fewer setae of the prelabral region, and in the 

 characteristic form of the first maxillae, etc. 



Ballophilidae 

 Ityphilus guianensis, sp. nov. 



Plate V, Figs. 20, 23, and 24 



General color in alcohol fulvous. 



Head without frontal suture, short, a little wider than long, 

 the ratio of width being about i9+:i8. Anterior and posterior 

 margins truncate, the latter much the longer (Plate IV, Fig. 22). 



Antennae distally strongly clavate, geniculate. The enlarged 

 subcylindrical distal portion embraces the last six articles of 

 which the first is transitional, being narrow at base and strongly 

 widening distad. Articles, excepting the ultimate, all wider than 



