6o 
Psyche 
[March-June 
Epigyne and vulva (Figs. 11-13). Epigyne as depicted by Ivie 
(1966: figs. 6-7). Scape folded and reappearing from below the 
main body of the scape with a rounded, membraneous tongue, which 
possesses a semi-covered depression. Entrances of ducts situated in 
the main body of the epigyne, laterally and behind the bend of the 
scape; ducts converging in forward direction, then curving outwards 
to turning-points and to the receptacula seminis, which lie close to 
the turning-points. The short fertilization-ducts curving to dorsal 
side and ending as open gutters. 
From the structures of palp and epigyne it is clear that the me- 
dian apophysis, in connection with the depression at the tip of the 
scape, serves as an important means of support during copulation. 
The scape of the epigyne looks rather rigid and probably cannot be 
pulled out of its resting position very far (cf. Lepthyphantes ) , though 
the ventralmost part may get pushed away from the main body so as 
to allow the embolus to reach the entrance of the duct of the epigyne. 
The exact functions of the hook-like projection of the cymbium, the 
proximal, roughened extension of the paracymbium, and the lateral 
arm of the radix are not easily understood without the aid of actual 
observation of the pairing in one of the species of this group. 
Acknowledgements 
The present study is part of a general survey of North American 
Linyphiidae, supported by Public Health Service Research Grant 
AI-01944, from the National Institute of Allergy and Infectious 
Diseases, to H. W. Levi. 
The help with types and other specimens by the following institu- 
tions and their curators is thankfully acknowledged : Dr. Herbert 
W. Levi, Museum of Comparative Zoology, Harvard University, 
Cambridge, U.S.A. (MCZ) ; Dr. John A. L. Cooke, American 
Museum of Natural History, New York (AMNH); Dr. C. A. 
Triplehorn, Ohio State University, Columbus, Ohio; Dr. Robin E. 
Leech, Canadian National Collection, Ottawa, Canada (CNC). 
Thanks are also due to Dr. William A. Shear, Concord College, 
Athens, W. Virginia, for information on his collection. 
References 
Barrows, W. M. 
1940. New and rare spiders from the Great Smoky Mountains National 
Park region. Ohio J. Sci., 40: 130-138, figs. 1-12. 
Crosby, C. R. 
1937. Studies in American spiders: the genus Aigola Chamberlin. Proc. 
Biol. Soc. Washington, 50: 35-42, pi. 1. 
