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1883.] 193 (Packard, 
The genus is distinguished from Trichopetalum by its want of eyes, its 
broader head, its long slender body, with long sete, by the eighth pair of 
female rudimentary legs ending in a claw. From Zygonopus it differs in 
the shorter sixth antennal joint ; its broader head ; its slenderer legs, the 
sixth pair in the female not being unlike the others, and by the more 
prominent, shoulders and longer seta. The species of the two genera are 
of the same general form and size. 
The genus Scoterpes was proposed by Prof. Cope for the present species 
in the American Naturalist for July, 1872, p. 414. The characters given 
are the ‘lack of eyes and of lateral pores ;’’ the absence of the latter hav- 
ing been ‘asserted by Dr. Packard.’’ Ignorant of the difference be- 
tween the Mammoth cave blind Myriopod and Lysiopetalum, the latter 
being the only genus of the family then known, we referred it to that 
genus (Spirostrephon). 
ScormrRrEs copxnr Cope. 
Spirostrephon (Pseudotremia) coped Packard, Amer. Nat.,v, 748, Dec., 1871, 
Scoterpes copet Cope, Amer. Nat., vi, 414, July, 1872. 
Sptrostrephon copet Harger, Amer. Journ, Sc., iv, Aug., 1872. 
Packard, Zoélogy, Edit, 1-8, 1879-81. 
About 20 oi and 2 examined. Body white, with no dusky discolora- 
tions ; 80 segments besides the head in specimens 11™™ in length and 52 
Pairs of legs ; in one female individual 8"™" long there were 49 pairs of 
legs, including the eighth or rudimentary pair; in other individuals 6m 
long there are 24. segments behind the head. The head is provided with 
short, fine erect hairs of different lengths, especially on the sides of the 
Senex. In the absence of a second species, we cannot distinguish all the 
Specific from the generic characters; for minor specific characters the 
reader is referred to figures to be hereafter published by the Geological 
Survey of Kentucky. 
The males and females are alike in size and form. 
The specimens were most abundant in the Labyrinth in Mammoth cave, 
but also occurred in other localities in the cave. It is also common in 
Diamond cave, where I collected it, and was discovered by Mr. Sanborn 
in Poynter's cave, 800 yards from daylight. In one of the specimens 
from the last-mentioned cave, the antennx were rather more slender than 
usual, 
The genus Scoterpes, and its single species copet, appears to be limited 
to Mammoth eave and the others near, in apparently the same system of 
caves. It was erroneously reported by me to occur in Weyer’s and the 
Luray caves, as the specimens collected belong to Zygonopus whiter. 
Without doubt the genus is a modified Trichopetalum, which has become 
longer and slenderer in body, with longer legs and antenne as well as 
sete ; whether it is a descendant of Trichopetalum lunatum or not is un- 
certain ; it may have descended from a different species ; but there seems 
PROC, AMER, PHILOS. 800. XXI. 114. Y. PRINTED SEPTEMBER 17, 1883. 
