20 
Psyche 
[March - June 
shaped with only two large basal internal teeth. Empodial appendage 
with a basal internal swelling and a large external tooth upon a dis- 
tinct lamella. Tenent hair small and acuminate. Mucro with apical 
tooth gradually curved and more than twice as long as anteapical ; 
basal spine absent. Anterior macrochaetae as follows: dorsum of 
head with five interantennal setae and a row of six setae near each 
antenna base and a pair near the center of the dorsal field ; a diagonal 
row of three and group of four setae near each latero-posterior margin 
of the dorsum; ventral surface with two mid-lateral patches of densely 
packed setae. Second thoracic segment with three to four rows of 
setae along the anterior margin and a single row along the lateral 
margins. 
Type locality: Old Spanish Cave, Stone County, Missouri, VI ’59, 
Tecklin, Darland, and Hedges coll. Also known from Coleman’s 
Cave, Montgomery County, Tennessee. It is probably widespread 
but uncollected in caves between these two points. 
Discussion 
This species is the only Nearctic member of the genus to lack a 
basal spine. Except for this remarkable feature it is very similar to 
P. folsomi although it shows a number of cave adaptions not found 
in th is last species. 
Pseudosinella orba, new species 
Figures 43-46 
Facies typical of genus. Color white without trace of pigment. 
Head circular, eyeless. Antennae about twice as long as cephalic 
diagonal, all segments slightly ellipsoidal; second and third segments 
subequal in size; apical organ of third segment with two blunt oval 
pegs. Second thoracic segment slightly humped. Fourth abdominal 
segment about three times as long as third. Unguis broad, apically 
slightly hooked, basal internal teeth large, subequal, and arising well 
above the base of the claw; median unpaired tooth prominent and 
about at mid-level of unguis; a pair of small lateral teeth are near 
the base. Empodial appendage lanceolate, with external margin 
serrate and basally expanded. Tenent hair slender and acuminate. 
Explanation of Plate 4 
Figure 62: P. spinosa, Habitus, specimen from Payne Saltpeter Cave, 
Grundy Co., Tenn., setae omitted; 18 X. Figures 63-65: P. honeti n. sp. 63. 
Habitus, holotvpe ; 18 X. 64. Mucro, holotype ; 350 X. 65. Hind claw, para- 
type; 250 X. Figure 66: Map showing known cave locations of six troglophile 
species of Pseudosinella in the U. S. Figure 67: Map showing cave distribu- 
tion of seven troglobite species of Pseudosinella in the U. S. 
