MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 
45 
hairs on each ventral segment. Male with the second ventral segment triangularly excised; female with two small 
holes; palpi thin, longer than the body by about the length of their fingers; hypopodium oblong, incurved; tro¬ 
chanter short, enlarged at tip, incurved, about half as thick as long; femur very long, straight, cylindrical, slender, 
a little convex above before the tip, as long as the thorax and the three basal segments oi the abdomen ; tibia similar 
to trochanter, incurved, enlarged at tip, less than 
half as long as the femur; chela thin, one-half longer 
than the femur; the hand as thick as the tibia, cylin¬ 
drical, a little enlarged below just beyond the artic¬ 
ulation, straight, shorter than the femur; fingers as 
long as the femur; slender, straight, viewed in pro¬ 
file a little incurved, the tips hooked suddenly, the 
movable finger a little shorter; both with a series of 
sharp teeth inside; legs slender, the two anterior 
pairs as long as the body, the two posterior pairs ex¬ 
tending beyond the body the length of the tarsus; 
hypopodia oblong, a little incurved, those of the 
first pair a little pointed before; trochanter short, a 
little longer than thick; femur long, cylindrical, 
tibia half as long as the femur; first tarsal joint as 
long as the tibia, second as long as the femur; the 
two posterior pairs with the trochanter and base of 
the femur enlarged; femur with a spurious articula¬ 
tion before the middle; first tarsal joint shorter than 
the tibia; all legs with long fine hairs; two very 
slender and strongly-curved hooklets on tip; between 
them an anchor-shaped plan tula with a thin cylin¬ 
drical stem. The palpi of female are as long as those 
ofthemale. Length 2.3 mm =.09inch. Habitat: Wy¬ 
andotte Gave, Indiana; five males, one female, in 
alcohol. The female has a small external indentation 
of the movable finger of the mandibles; the finger of 
the males has no indentation, but in two specimens 
the tip is somewhat broader, more obliquely cut, and 
with a fine engraved line where the indentation 
should be.’” 
The discovery of this blind Pseudoscorpion in 
America is very interesting. It belongs without any doubt to Schicedte’s genus Blothrus, which, on careful exami¬ 
nation, proves, however, to be merely Chthonius with undeveloped eyes, and is the smallest species known. . 
“ C. (Blothrus) spelceus differs by the longer tibia of the palpi, and by the two anterior pairs of legs with a two- 
jointed tibia. The last statement is doubted by Mr. Simon,, but Mr. Schicedte’s accuracy is so well known that his 
statements are to be accepted. (U.) abeillii has much longer palpi and legs, and the sexes of dissimilar development. 
(U.) brevimanus is only known to me by an insufficient diagnosis. ( B .) cephalotes seems rather similar to ( B .) paclcardi, 
only a little larger, the mandible granulated, nearly as long as the thorax; the fingers of the pal))i equally longer.” 
Another form, with two eyes, occurs in the Mammoth Cave: 
“It is pale yellowish; the thorax, mandibles, palpi, legs, and segments of the abdomen about the same color 
the base of the mandibles a little darker, the abdomen between the segments and on the sides paler. 
“Ihave seen only three specimens in alcohol, all from the Mammoth Cave region, one couple from one locality 
and a female from another locality. I have compared all very carefully with C. (Blothrus) paclcardi from Indiana. 
They are a little longer, 3 to 3.2 mm long, a little darker or perhaps a little less white, but all three have on each 
side of the thorax one eye, distant from the anterior border as far as the length of the diameter of the eye ; the movable 
finger of the mandibles is not indented. The examination of all other details shows no difference. Habitat, from 
the bottom of Dome, Mammoth Cave, with dead bat, November 9, and Long Cave, near Glasgow Junction, Kentucky, 
one mile from daylight, May 11.” 
My specimens, two males and two females, from the Rotunda in Mammoth-LJaveHiay 6 each two eyes, which, how¬ 
ever, vary in the convexity of the cornea and are so faint as to be easily overlooked. The males are very white; one 
of the females shows traces of an indentation on the mandibular finger. The male from -which the figure was drawn 
measures 3 mra in length, or, exclusive of the mandibles, 2.3 mm . The hairs upon thorax and abdomen, which are cor¬ 
rectly represented in the figure, differ slightly from the description of the blind form, but they are probably variable. 
To Dr. H. Hagen my grateful acknowledgments are due for invaluable aid and suggestions. I have added 
nothing to his observations on Pseudoscorpious; the portions indicated by quotation marks are copied almost ver¬ 
batim from his manuscript. 
Hagen states in liis original notice in the Zoologischer Anzeiger, in which he speaks of the 
present species as Blothrus paokardi, that “it certainly belongs to Blothrus, Schicedte, and is the 
smallest known species,” 
e 
Fig. 12.— Chthoniuspackardii: a, male enlarged fifteen times; b, man¬ 
dible; c, serrula of the mandible; d, finger of the mandible; e, chela of 
pedipalp;/, end of tarsus; g, plan tula.—After Hubbard. 
