Tertiary Spiders and Opilionids. 261 



Scudder, Tertiary Insects, 1890, p. 89, Plate 11, fig". 12. 



One female, No. 11651 (now No. 61) from Florissant in the 

 Scudder Collection of the Museum of Comparative Zoology of 

 Harvard University. 



Scudder's description is entirely correct in every detail. 



SUB-FA:\riLY EPEIRIN^E. 



This is a very large sub-family and the separation into groups 

 and genera is based on many characters, some of which may be 

 expected to remain preserved even in paleontological material, 

 while others, like the difference in the structure of the inner and 

 outer claws, certainly would not be discernible. Scudder places 

 under the genus Epeira six distinct species, one specimen which 

 is only partly preserved and several pieces with nothing but a 

 leg on each. He also refers four species to a genus Tethneus 

 established by him for these species. The history of the genus 

 lipcira and its prototype Araiica shows how difficult it is to lind 

 permanent characters by which to distinguish the si)iders referred 

 lo Epeira and a dozen or so of related genera. T consider it a 

 mistaken attitude to abolish the genus Tethneus which after all is 

 not applical)le to recent spiders, and shall quote here the defini- 

 tion given by Scudder. 



Genus Tethneus Scudder. 



Spiders "compact in form, with short and stout legs of not 

 very unequal length, and in particular the first two pairs of legs 

 are unusually heavy. The second and fourth pairs of legs are of 

 nearly equal length, or the second pair may be slightly longer; 

 the femora of the first and second pairs of legs are at base as 

 broad as or even broader than half the width of the cephalo 

 thorax, and the longest legs are less, generally considerably 

 less, than twice as long as the body" (p. 78). 



Besides the four species described by Scudder I refer to this 

 genus two new species. 



Tethneus guyoti Scudder {Text figure 2/). 

 Scudder, Tertiary Insects, 1890, p. 78, Plate 11, figs. 8 {$), 



10(5). 



Scudder described one female, No. 320 (now No. 91) and one 



