382° The American Naturalist. [May, 
istic, and well illustrate the hairy character of the animal. It 
has only occurred to me in this single locality, but may be 
found at other places in the cave where there are similar con- 
ditions of moisture. 
PSOCIDÆ. 
“Dorypteryx (?) hageni Banks. Nov. sp. (Plate X, Fig. 4.) 
“Length 1.5 mm. Wholly pale, except reddish-brown eyes 
and mandibles. Head, thorax, legs and hind segments of abdo- 
men clothed with fine short hairs. Ocelli sometimes distinct, 
sometimes not; basal part of antenne of three joints, rest miss- 
ing; maxille plainly trifid; legs slender, tibie much longer 
than femora, tarsi three-jointed, basal joint longest ; wings rudi- 
mentary; second segment of the abdomen very long and 
smooth, subcylindric, forming the greater part of abdomen, on 
the venter it is prolonged by a median triangular piece over 
the next segment; other segments much shorter, and tapering 
to the tip. 
“Several nymphs from Mammoth Cave, Ky. This may be 
the species to which Hagen refers in Packard’s Cave Memoir, 
but it certainly is not the Dorypteryx pallida Aaron, which 
differs in broader nasus, more prominent eyes and larger 
thorax.” (Banks.) 
A number of specimens were found under wet and decaying 
fragments of boards in the Labyrinth in a small pit under the 
way leading to the top of Gorin’s Dome. In this locality are 
the accumulations of many years of replacement of old bridges 
and steps which lead up the steep declivity which is so near 
the Dome, and the debris, well decaved and crumbling, affords 
the richest collecting ground in the cave. Spiders, flies, beetles, 
crickets, myriopods, mites all are here and the largest series 
to be found at any single place may be obtained. The particu- 
lar forms which are the subject of this description find abund- 
ant food in the microscopic fungi which here abound. 
ACARINA. 
“Rhagidia cavicola Banks. Nov.sp. (Plate X, Fig. 3.) 
“Length .7 mm. Whitish, legs hyaline. Cephalothorax 
pointed behind, and with a distinct segment behind it and be- 
