1960] 
Christiansen — Genus Pseudosinella 
13 
Distribution: a common epigeic form on. the Pacific coast. Cave 
collections in the United States: Reids Cave, Fayette County, Ken- 
tucky; and Carlsbad Caverns, Eddy County, New Mexico. 
Discussion 
This fo rm appears to be a rare troglophile in caves in the United 
States. Further exploration and collecting in western caves may show 
it to be more common than presently appears. 
Pseudosinella alba (Packard) 
Figures 17-21 
Lepidoeyrtus albus Packard 1873, Peabody Acad. Sci. 5th Ann. Rept: 
37 - 
Sira ( Pseudosinella ) alba Schaffer 1900, Jahib. Ver. Vaterl. Natur. 
56 : 269. 
Pseudosinella alba Borner 1901, Zool. Anz. 24: 707. 
Facies typical of genus Lepidoeyrtus. Background color dull yel- 
low white with scattered bluish or brownish pigment. Eyes two per 
side on square black pigment patches. Fourth antennal segment fusi- 
form, third segment truncately conical and remainder subcylindrical ; 
third segment noticeably shorter than second and with apical organ of 
two short subcylindrical pegs. Second thoracic segment slightly en- 
larged, with head prognathous. Fourth abdominal segment about 
four times as long as third. Unguis with three inner teeth with basal- 
most tooth being the largest. The empodial appendage is lanceolate 
with a small but clear external tooth. Tenent hair clavate. Mucro 
with apical tooth about twice as long as anteapical and not strikingly 
upturned ; basal spine barely attaining apex of anteapical tooth. 
Anterior macrochaetae as follows : on the dorsum of head a group of 
four setae along the base of each antenna, and a group of four interan- 
tennal setae forming the corners of a narrow rectangle; in the center 
are four more setae marking the sides of a triangle which has its apex 
just anterior to the anterior pair. Ventral surface of head sparsely 
covered with setae over the anterior median portion. Anterior margin 
of second thoracic segment with a double row of setae. 
Type locality: epigeic but uncertain, probably Massachusetts. A 
common epigeic form in the United States known from Mystery and 
Niagra Caves in Fillmore County, Minnestota and Christian Cave 
in Robertson County, Tennessee. 
Discussion 
I have examined and measured a considerable number of epigeic 
forms of this species and can find no significant differences between 
