62 FAUNA OF MAYFIELD'S CAVE. 



Linyphia marginata Koch. 



HERR-SCHAEFF, Deutschl. Ins., 127, 21, 22. EMERTON, Trans. Conn. Ac., vi, 61, pi. 



18, fig. 1 (New England). KEYSERLING, Die Spinn. Am., Therid., n,58, fig. 164. 



KOCH, Die Arachn., xn, 118, figs. 1041, 1042. MARX, Proc. U. S. Nat. Mus., xn, 



1889, 528. 

 Linyphia marmorata HENTZ, Jour. Bost. Soc. Nat. Hist., VI, 29; Spid. U. S., ed. 



Burgess, 133, pi. 15, fig. 5. 

 Linyphia scripta HENTZ, Jour. Bost. Soc. Nat. Hist., vi, 24, 134, pi. 15, fig. 6. 



Often seen inside the mouth of the cave, where its webs and young 

 occurred, but not found beyond " 2. " A very common spider, living in 

 shady woods and widely distributed in Europe and the United States. 



Linyphia nigfrina Westring. 



WESTRING Forteckning ofver till narrvarande tidkanda, 1851, 38 (New Hampshire, 

 Massachusetts, Rhode Island, Maryland, District of Columbia). MARX, Proc. 

 U. S. Nat. Mus., xil, 1889, 528. 



Linyphia pulla BLACKWELL, Spid. of Gr. Brit., n, 234, fig. 156. 



Diplostyla nigrina EMERTON, Trans. Conn. Acad. , vi, 65, pi. 20, fig. 2 (New England) . 



Found in twilight near the door. Three taken at different times 

 suspended by single webs. This species commonly occurs under leaves, 

 etc. , outside of caves. 



Willibaldi cavernicola Keyserling. 



KEYSERLING, Die Spinn. Am., Therid., II, 123, fig. 204 (Reynolds Cave, Kentucky) . 

 PACKARD, Mem. Nat. Acad. Sci. IV, 1888, 58, pi. 15, fig. 32 (Reynolds Cave, Ken- 

 tucky). MARX, Proc. U. S. Nat. Mus., xn, 1889, 531. 



Not found in Mayfield's Cave, but 2 specimens were taken in Don- 

 aldson's and 3 at Twin caves at Mitchell. It is a true cave form. The 

 colors are dull and the eyes very small. Of the three specimens in my 

 collections, one has eight eyes, all of which are quite small and colorless; 

 the middle pair in the back row are largest and the middle pair in the 

 front row next in point of size, while the side eyes of the front row are 

 difficult to see even with considerable magnification and the lateral 

 posterior ones are scarcely discernible. The second specimen has but 6 

 eyes visible, the sizes ranging as before and the ones missing being the 

 lateral posterior eyes. In the third specimen the eyes range in size as 

 in others, while one and possibly both of the lateral posterior eyes are 

 missing, and the lateral anterior eyes are barely visible. I have not 

 seen Keyserling's description, but from his figure, which Packard (1888, 

 plate xv, fig. 32) has copied, the eyes are small, and the front middle 

 ones extremely minute. Willibaldi (Linyphia) incerta Emerton (1875, 

 280) from Kentucky caves has small, colorless eyes, while the front 

 middle pair is usually lacking. 



