392 
Psyche 
[December 
5b. Fourth coxa without such spines 6 
6a.. Size about 1 mm in length, color very light S. teapensis 
6b. Size about 2 mm in length, dorsum darker S. annulipes 
Though several of the species reported by Goodnight, 1951, were 
found in caves, it is evident that the new species is the only known 
member of this genus that is a true cavernicolous form. This species 
shows a great number of structural adaptations to cave life : com- 
plete loss of eyes, minor degree of sclerotization, lighter color, and 
an increase in length of all appendages in comparison with related 
epigeic species. The remarkable length of the second pair of legs 
expresses the development of a tactile function in the legs of blind 
species. It must be recognized that these differences are due to adapta- 
tion for a cave existence, rather than to phylogenetic divergence, and 
are not valid to segregate this new species from the genus Stygnomma. 
Stygnomma fiskei n. sp. 
Figures 1-12 
Types. Male holotype, female paratype and 1 juv. from Coffee 
River Cave, Auchtembeddie, 1 J 4 miles north of Oxford, Manchester 
Par., Jamaica, collected 4. IV. 1968, in the Museum of Comparative 
Zoology. 
Description. Male holotype. Total length 2.85 mm. Greatest 
width of body 1.78 mm. Chelicera proximal article, 1.07 mm; distal 
article, 1.28 mm. Palpal femur, 1.78 mm; petella, 0.86 mm; tibia, 
1.40 mm; tarsus, 1.10 mm; total length 5.14 mm. Femur of first 
leg, 2.14 mm; total leg length 7.92 mm. Second femur, 3.50 mm; 
total length, 14.00 mm. Third femur, 2.42 mm; total length 9.14 
mm. Fourth femur, 3.28 mm; total length, 11.88 mm. 
Anterior margin of cephalothorax with one lateral projection on 
each side, one in the middle and one close to the outer side of each 
chelicera (Fig. 1). Dorsum smooth, with only a few small granu- 
lations along the lateral abdominal scuta, a transverse line of small 
hairs on the scutum, three free tergites and anal operculum. Cephalo- 
thorax without eye tubercle. Eyes and corneal lenses absent. Ab- 
dominal scutum with five dorsal areas, except for the first, the 
boundaries of which are parallel to one another, but very poorly 
defined. Ventral surface and coxae with scattered thin hairs. Spiracles 
clearly visible. Hair-tipped tubercles (more or less arranged in rows), 
are present on the anterior and posterior margins of coxae III and 
IV, posterior margin of coxa II and near the anterior margin of 
