24 
Psyche 
[March - June 
with a small apical cone; apical organ of third segment with two 
flattened, fusiform, basally constricted paddles, in separate shallow 
folds. Second thoracic segment strongly humped forcing head into 
an opisthognathous position. Fourth abdominal segment about seven 
times as long as third. Unguis strikingly elongate, without external 
teeth but with three very small internal teeth, the basal pair being on 
a level and slightly smaller than the median unpaired tooth. Empodial 
appendage lanceolate, slender and with a striking internal basal ex- 
pansion. Tenent hair small and acuminate. Mucro with anteapical 
tooth displaced toward apex; teeth subequal in size; basal spine not 
attaining level of anteapical tooth. Dens with one or two rows of 
heavy finely ciliate spines along anterior two thirds. Anterior macro- 
chaetae as follows : dorsum of head with an interantennal group of 
five setae; a curved row of nine setae along each antennal base; ven- 
tral surface covered with numerous setae. Second thoracic segment 
with two to three rows of setae along anterior margin and a single 
row along the lateral margins. 
Type locality: Alladin’s Cave, Madison County, Alabama, H. 
Henrot coll. Distribution : limited to central Tennessee and north- 
east Alabama. Abundant within these limits. 
Discussion 
This is by far the most stable of the common troglobite species of 
this genus. The only striking variation is seen in the mucro, which 
has occasional populations with the anteapical tooth much more basal 
than is normal. Other variations are minor; for example, some forms 
are entirely white while others have a scattering of pigment over the 
whole body. The inner ungual teeth are often so minute as to be 
invisible under low magnifications. The dental spines are often 
difficult to observe. 
Pseudosinella boneti, new species 
Figures 63-65 
Body elongate, appendages very attenuate. Color white without 
trace of pigmentation. Head oval without eyes. Antennae four or 
more times as long as head with all antennal segments subcylindrical ; 
apical organ of third antennal segment with two paddle-shaped setae 
having the supporting rod along one margin. Second thoracic seg- 
ment greatly enlarged, forcing the head into a hypognathous or opis- 
thognathous position. First abdominal segment strikingly compressed; 
fourth abdominal segment almost seven times as long as third. 
Unguis extremely thin and elongate having only a single pair of in- 
