Occasional Papers of the Museum of Zoology 5 



posterior surface; on the postero-ventral surface are scattered small 

 black spines which form a fairly distinct longitudinal row or tract; 

 scattered among these spines are four to six black bristles or long 

 slender spines; on the antero-ventral surface is an inconspicuous 

 row of a few small black spines. Second femora with a row of long 

 almost colorless bristles on the ventro-posterior surface as on the 

 first femora; ventral surface basally with many small black spines 

 which, passing apically, resolve themselves into two rows, the 

 posterior row or tract of uniformly small spines more or less irregu- 

 larly scattered, the anterior row definitely single-rowed with the 

 spines increasing in size from the base to the apex. Third femora 

 similar to the second, but the row of pale bristles on the ventro- 

 posterior surface confined to the apical half or two-thirds, the 

 black spines on the ventral surface less numerous, the anterior and 

 posterior rows, in the apical half, equally definite and well-defined 

 single rows, and the spines of the posterior row longest at about 

 two-thirds the length of the femur, diminishing in size apically and 

 basally from this point; the anterior row is similar to the anterior 

 row on the second femora. The first femora are 3 mm. long; the 

 second, 3.4 mm.; and the third, 5 mm.; the first tibiae are 2.8 

 mm. ; the second, 3 mm. ; and the third, 3 . 2 mm. (all measure- 

 ments on the dorsal surface). 



Accessory genitalia, including the penis, relatively simple; 

 the first hamule is a flattened plate, convex externally, concave 

 internally, with the anterior edge the heavier and with the apical 

 anterior corner bearing a strong interno-posteriorly directed hook; 

 second hamule thornlike, slightly flattened. 



Described from two males. Tiger Creek, near Tumatumari, 

 on the Potaro River, British Guiana, February 5 and 7, 191 2, the 

 first the type in Coll. E. B. W., the second in Coll. P. P. C. Both 

 specimens were taken resting on the flat surface of leaves overhang- 

 ing Tiger Creek. One was taken only a short distance below 

 Washerwoman Falls, the other possibly a mile below. 



