64 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Zygonopus whitbi Eyder. Plate VII, figs. 1, la-lo. 



Zygonopus whitei Eyder, Proc. U. S. Nat. Mus., iii, p. 527, February 16, 1881. 

 Zygonopus whitei Pack., Proc. Amer. Phil. Soc. , 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 

 setae ; autennae 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 setae, a few on the 

 end of joint 5 longer than any on joints 6 and 7. The setaa on the body arise from tubercles arranged, as usual, in 

 a scalene triangle, and the setae themselves are half as Jong 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 setae 

 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 laminae 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 ; Eyder). 



This species in size and general appearance would be easily mistaken for Scoterpes copei, Which we at first, from 

 a too-hasty examination, supposed it to be. Mr. Eyder'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 setae, 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 |- mm . 



Cambala Gray. 



Julus Say, Journ. Acad. Nat. Sci., Phila., ii, 103, 1821. 



Cambala J. E. Gray, Griffith's Cuvier's An. Kingd., xiv, Insecta, i, PI. 135, fig, 2, 2a, 26, 2c, no descr., 1832. 



Beasia E. Jones, Todd's Cyc. Anat. Phys., Art. Myriopoda, 546. 



Cambala Gervais, Newport, Ann. and Mag. Nat. Hist., xiii, 266, 1844. 



Cambala Gervais, Apteres, 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 antenna? 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 ina 

 linear row of ocelli, forming a straight line, situated far behind the insertion of the antennas, 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. 

 Antennae 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 

 microscopic 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. 



