1960] 
Christiansen — Genus Pseudosinella 
2 5 
ternal basal teeth. Empodial appendage thin and basally swollen. 
Tenent hair minute and acuminate. Dens without spines. Mucro 
with apical and anteapical teeth close together and near apex, sub- 
equal in size , basal spine not attaining level of anteapical tooth. 
Antei 101 maciochaetae as follows! dorsum of head with seven inter- 
antennal setae and a row of eight setae along each antenna base; ven- 
tral surface with numerous densely packed setae along median and 
lateral area. Anterior margin of second thoracic segment with two to 
three rows of densely packed setae. 
Type locality: Pomps Cave, White County, Tennessee, III ’57 T. 
Bail coll. Also taken from Dairyhouse Cave in the same county; 
Wolf Cave, Morgan County, Alabama; and Wind Cave, Pulaski 
County, Kentucky. 
Discussion 
This well marked species represents the apogee of cave evolution 
in the Nearctic Pseudosinella. The series available is limited and little 
variation has been seen. In some forms the ungual teeth are entirely 
absent, and in the specimens from Alabama and Kentucky the median 
tooth of the mucro is less apical than in the Tennessee specimens. 
The specimens from Kentucky sometimes have a very small median 
internal ungual tooth. 
Literature Cited 
Bonet, M. F. 1931. Estudios sobre coilembolos cavernicolas con especial 
referenda a los de la fauna Espanola. Mem. Soc. Hist. Esp. Nat. 14: 221-403. 
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Bolivar et R. Jeannel dans 1’Amerique du Nord. 10 Collemboles. Arch. 
Zool. Exptl. et Gen. 76: 361-377. 
Borner, C. 1901. Neue Collembolen Formen und zur Nomenclatur der Col- 
lembolen Lubbock. Zool. Anz. 24: 696-712. 
Delamare Deboutteville, Cl. 1949. Collemboles Cavernicoles du Tennessee 
et de L’Alabama. Notes Biospeleoligiques. 4: 117-124. 
Denis, J. R. 1931. Sur la Faune itasienne des Collemboles. IV Notes pre- 
liminares de Collemboles de Caverne Italienne. Mem. Soc. Ent. Ital. 
10 (1) : 80-85. 
Guthrie, J, E. 1903. The Collembola of Minnesota. Rep. Geol. Nat. Hist. 
Surv. Minn. Zool. Ser. (4): 1-110. 
Packard, A. S. 1873. Synopsis of the Thysanura of Essex county with a 
description of a few extralimital forms. Ann. Rep. Peabody Acad. 
Sci. 1873: 23. 
Schaffer, C. 1897. Hamburger Magalhaenische Sammelreise. Apterygoten 
8: 1-48. 
Schott, F. 1902. Etudes sur les Collemboles du Nord. Bih. Svenska Vet. 
Akad. Handl. 28 (2) : 1-48. 
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