64 
MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 
Zygonoptjs whitei Ryder. Plate VII, figs. 1, la-lo. 
Zygonopus whitei Ryder, Proc. TJ. S. Nat. Mus., iii, p. 527, February 16, 1881. 
Zygonopus whitei Pack., Proc. Amer. Pliil. Soe., xxi, 194, 1883. 
Spirostrephon copei Pack., Amer. Naturalist, xv, 231, March, 1881. 
Eight males, ten females. Body white, long, and slender; number of segments, 32. Head with scattered, fine 
set®; antenn® with the second joint not quite one-half as long as the third, which about equals the fifth in length, 
both being rather long ; the sixth is thick, barrel-shaped, not quite one-half as long as the fifth, but scarcely thicker; 
the seventh joint is unusually long, a little more than three-fourths as long as the sixth joint; the end thick and well 
rounded, with the usual tactile large flattened set®; the third to seventh joints with long, dense set®, a few on the 
end of joint 5 longer than any on joints 6 and 7. The set® on the body arise from tubercles arranged, as usual, in 
a scalene triangle, and the set® themselves are half as long as the body is thick ; they are considerably shorter and 
finer than in Scoterpes. 
The number of pairs of legs in the male is forty-seven in a specimen 8 mm in length ; in the female there are forty- 
eight pairs. The sixth pair of legs of the male are somewhat longer and much swollen, the suture between joints 3 
and 4 is very slight, the two joints together forming an ovate section of the leg a little thicker than the length of the 
second joint; terminal joint long and slender, considerably longer than joints 3 and 4 together. The two-jointed 
eighth rudimentary pair of legs are longer and larger than in Scoterpes copei, the basal joint nearly twice as long, 
while the second (terminal) joint is larger and swollen, and, besides being larger, ends in three or four fine minute set® 
instead of a short claw, as in Scoterpes. Length, 8 mm . 
The male genital armature is very minute and rudimentary, and has already been described in a general way. 
With but one species as yet known it would be unsafe to assign their specific characters. The two inner lamin® are 
quite unequal in length and development, and the armature in general shows signs of degeneration, as though the 
species had originated from some form in which the male armature was more completely developed. Nine specimens 
were found by us in New Market and Luray caves, and about twenty' in Weyer’s Cave, Virginia; Luray Cave, Vir¬ 
ginia (Dr. C. A. White ; Ryder). 
This species in size and general appearance would be easily mistaken for Scoterpes copei, which we at first, from 
■ a too-basty examination, supposed it to be. Mr. Ryder’s excellent description characterizes the species, but his fig¬ 
ures are indifferent, the third joint of the male is much more swollen in our specimens, and the normal leg (his Fig. 3) 
is drawn too slender, while the front of the head is not correctly rendered. In our specimens drops of a yellowish 
secretion were attached in alcoholic specimens to the base of many of the set®, indicating the presence of repugnato- 
rial glands, though no pores could be found. On breaking the body in two, nearly ripe eggs occurred in June; they 
were rounded-oval; length, about f mm . 
Cambala Gray. 
Julus Say, Journ. Acad. Nat. Sci., JPhila., ii, 103, 1821. 
Cambala J. E. Gray, Griffith’s Cuvier’s Au. Kingd., xiv, Insecta, i, PI. 135, fig, 2, 2a, 26, 2c, no descr., 1832. 
Beasia R. Jones, Todd’s Cyc. Anat. Phys., Art. Myriopoda, 546. 
Cambala Gervais, Newport, Ann. and Mag. Nat. Hist., xiii, 266, 1844. 
Cambala Gervais, Apthres, iv, 137, 1847. 
Spirobolus (in part) Wood, Myr. N. Amer., 215, 1865. 
Cambala Cope, Proc. Amer. Phil. Soc., xi, No. 82, 181, 1869. 
Cambala Pack., Proc. Amer. Phil. Soc., xxi, 195, 1883. 
The essential, diagnostic characters of this genus are the linear eyes, the long slender body, with keeled scutes, 
while the antenn® are short and thick, much as in Spirobolus. 
The body consists of fifty-nine segments; the scutes with high keel-like ridges. The eyes are arranged in a 
linear row of ocelli, forming a straight line, situated far behind the insertion of the antenn®, next to the front edge of 
the first segment. The front of the head is somewhat longer than broad; the surface full and convex as in Julus. 
Antenn® are short and unusually thick, more so than in Julus or Spirobolus; seven-jointed ; joint 2 a little longer and 
thicker than 3; fourth shorter and more clavate than third; fifth rather thicker at end than fourth, but of about the 
same length; sixth thicker than any of the others, about as long as fifth; seventh very short, round, no longer than 
broad. The feet are slender, not quite so long as the body is thick. On the fourth lower large ridge is a whitish 
microsoopic spot, which under a half-inch objective is seen to be a short acute tubercle; these are Say’s “stigmata,” 
but they occur on each segment, aud are doubtless homologous with the setiferous tubercles in Trichopetalum, etc. 
The only species known has been mistaken for Lysiopetalum lactarium by Newport, Gray, and Gervais, hence the 
synonomy of the two genera is somewhat confused. Newport, adopting Mr. J. E. Gray’s manuscript name Cambala 
was the first to characterize the genus, remarking: “I have derived the characters of this genus from the specimens 
originally sent by Say to Dr. Leach.” It is probable that Say by mistake sent an example of his Julus annulatus instead 
of a L. lactarium, as the two species would be easily confounded, although his Julus annulatus must have been of course 
familiar to him. The mistake was a natural one. 
