188 [June 16, 
Packard.) 
and in which consequently there is the most variation in surroundings, 
temperature, access of light and changed condition of the air. Under 
such circumstances as these we should naturally expect the most variation. 
Var. carterensis. A decided approach to 8. lactarius is seen in certain 
brown specimens, only partly bleached, found in the Carter caves, Ken- 
tucky, viz. : Bat cave, X cave, anc Zwingler’s cave, besides a Gave across 
the road from the hotel, which is used as an ice-house. 
In the specimens from Bat cave, the antenn are slightly shorter, and 
a little slenderer, particularly joints 8-5 ; but joint 7 is much shorter and 
blunter than in the Bradford cave individuals; the antennme, however, 
are of the same length, though slenderer than those living in Great Wy- 
andotte cave. The eyes form a nearly equilaterally triangular area, 
with from 28 to 25 facets. The segments behind the head are thirty. 
They differ from the Wyandotte examples in the posterior or swollen por- 
tion being rather more prominent than in the former, forming more 
marked lateral swellings, with about eight ridges on the side of each boss, 
and the body is larger and thicker, but the legs are of the same length. 
The head is dark in front, mottled above and below with paler horn- 
color. The antenne are concolorous with the head and body, but the 
terminal joints are paler, as are the legs, which are also paler at the articu- 
lations. The entire body is dark horn-brown, mottled and irregularly 
lineated, 
The smoother anterior portion of the scuta shows a tendency to be paler 
than the tuberculated portion, and of a bluish-gray tint. The tubercles 
are no more prominent than in the Wyandotte individuals. 
The segments in both the Wyandotte species and var. carterensis rap- 
idly decrease in size, the penultimate segment being pointed, and each 
segment is provided with regular, high-raised parallel prominent ridges 
on the shoulder or lateral boss, about 40-45 on a scutum on the sixth seg- 
ment from the end of the body. 
Length 23" ; thickness 2.5", the body being considerably larger and 
thicker than in the Wyandotte specimens, 
Two specimens from X cave are exactly in size and color like those 
from Bat cave. 
Three specimens from the ice-house cave only differ from those in Bat 
cave in being somewhat paler, but the eyes and antennw are the same. 
A large and a partly grown one from Zwingler’s cave was collected by 
Mr. Sanborn, Aug. 23; these were also paler than those from Bat cave. 
With them were associated a Ceuthophilus with eyes well developed, and 
Polydesmus. 
This form or variety would be, perhaps, mistaken for Lysiopetalum lac- 
tarium, but it is true in all the generic details to Pseudotremia ; at the 
same time it is what may be called a ‘‘twilight’’ species, living in small 
caves in situations partially lighted. It is probably derived from L. lac- 
tarium, or a closely allied species ; we doubt if it will ever be found living 
in the same situations as L. lactarium. 
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