168 bulletin: museum of comparative zoology. 



the eyes, narrowing forwards; it encloses a large dark area of similar 

 shape but smaller which is geminate by a median longitudinal pale 

 stripe the anterior sagittiform end of which is itself faintly geminate 

 by a dark line. The sides of the head above about the eyes and 

 antennae are chocolate-brown, the lower part pale. Sides greyish 

 yellow and venter of body yellow. The legs are ochraceous and wholly 

 without darker annuli, spots or other markings. 



Number of segments in the second tarsi of legs seven to nine from 

 thirty-five to forty-three, mostly above forty. In the eighth legs 

 twenty segments in first tarsus as against eleven in P. j^uJchritarsis 

 and in the fourth legs nineteen as against thirteen. First flagellum 

 of antenna consisting in the type of eighty-two segments, the second 

 flagellum of two hundred and nine plus as against sixty-two to sixty- 

 four and one hundred and forty-sLx respectively in P. 2>ulchritarsis. 



The styoma saddles strongly elevated. Caudal margins of plates 

 mesally not strongly excavated. The last dorsal plate with caudal 

 margin only moderately concave with the median region of concavity 

 not at all extended as in P. pulchritarsis. 



A robust species. The type is 38 mm. long; with the antennae 

 (not wholly complete) over 50 mm. 



57a. PSELLIOPHORA CAVINCOLA, Sp. UOV. 



Ty2)e.— M. C. Z. 1,884. Paratype.— M. C. Z. 1,885. Trinidad: 

 Guacharo Cave, April 23, 1916. Taken on the wall of the cave, "far 

 in." C. B. Williams and F. W. Urich. 



A very large and robust species. The dorsum has on each side of 

 broad stripe of deep chocolate to black color with a narrow marginal 

 stripe and a clear median longitudinal stripe which encloses no such 

 dark markings as occur in the preceding species and which extends 

 across the head. The venter clear yellow. Legs yellowish with the 

 prefemur and femur strongly marked with blackish or deep chocolate, 

 the prefemur having above a distal dark annulus which is broken on 

 the ventral side and a weaker subbasal one more widely broken 

 ventrally. The femur above is dark over its distal half or this may 

 be more or less segregated into a distal and a median band, the corre- 

 sponding ventral subbasal dark band which shows more vaguely on 

 the ventral side. The next joint or tibia shows three dark annuli 

 which are more obscure; these are long in comparison with the light 

 portions. 



