746 THE MAMMOTH CAVE AND ITS INHABITANTS. 
upon the Kentucky river. It is closely allied to the Mammoth 
Cave species. According to Mr. Scudder, the specimens of R. 
stygia were found by Mr. A. Hyatt “in the remotest corner of 
Hickman’s Cave, in a sort of a hollow in the rock, not particularly 
moist, but having only a sort of cave dampness. They were 
found a few hundred feet from the sunlight, living exclusively 
upon the walls.” Even the remotest part of that cave is not so 
gloomy but that some sunlight penetrates it. 
The other species is found both in Mammoth Cave, and in the 
adjoining White’s Cave. It is found throughout the cave, and 
most commonly (to quote Mr. Scudder) “ about ‘Martha’s Vine- 
yard’ and in the neighborhood of ‘Richardson’s Spring’ where 
they were discovered jumping about with the greatest alacrity 
Fig. 126. 
Rhaphidophora subterranea, 
upon the walls, where only they are found, and even when dis- 
turbed, clinging to the ceiling, upon which they walked easily ; 
they would leap away from approaching footsteps, but stop at a 
cessation of the noise, turning about and swaying their long an- 
tennæ in a most ludicrous manner, in the direction whence the 
disturbance had proceeded; the least noise would increase their 
_ tremulousness, while they were unconcerned at distant motions, 
unaccompanied by sound, even though producing a sensible cur- 
rent of air; neither did the light of the lamp appear to disturb 
them ; their eyes, and those of the succeeding species (R. stygia) 
are perfectly formed throughout, and they could apparently see 
with ease, for they jump away from the slowly approaching hand, 
so as to necessitate rapidity of motion in seizing them.” 
The Thysanurous N europtera are represented by a species of 
Machilis, allied to our common Machilis variabilis Say, common in 
Kentucky and the middle and southern states. So far as Tell- 
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