Superfamily Argiopoidea 



anterior median eyes are much more than the diameter of one of 

 them apart. This is the genus Willibaldia of Keyserling. 



Two species are known from this country and one from 

 Europe. 



Troglobyphantes cavernicolus (T. cav-er-nic'o-lus). — The fe- 

 male is about one tenth inch in length; the male, less than 

 one twelfth. The cephalothorax, legs, and pedipalps are light 

 or brownish yellow; the abdomen, white or light gray. The upper 

 margin of the furrow of the chelicerae bears two quite large teeth, 

 the lower margin, one small one. 



This spider has been found in caves in various parts of the 

 United States. I am indebted to Mr. Cyrus R. Crosby and to 

 Mr. Paul Hayhurst for specimens from a cave at Rocheport, 

 Mo. These were taken on little sheet-webs on the walls 

 and on the roof of a very damp and perfectly dark chamber 

 of the cave. Mr. Crosby collected also the egg-sacs. These 

 are white, and were attached to the lower side of little projections 

 of the wall of the cave. 



Troglobyphantes incertus (T. in-cer'tus). — 1 have not seen 

 this species, but from the published descriptions it appears to 

 resemble the preceding very closely in size, colour, and in habits. 

 The upper margin of the furrow of the chelicerae bears seven teeth. 



Genus LABULLA (La-bul'la) 



The anterior eyes are large, equal in size, and in a slightly 

 recurved line; the median ocular area is longer than wide and 

 about as wide in front as behind. The bulb of the pedipalps of 

 the male is large and furnished with a long embolus, rolled in a 

 circle. Only a single species has been found in the United States; 

 this was described from the State of Washington. 



Labulla altioculata (L. al-ti-oc-u-la'ta) .— -The body measures 

 about one third inch in length. The cephalothorax is light yellow; 

 the abdomen light gray, with a large triangular black spot at the 

 base and several transverse black bands between this and the tip 

 of the abdomen. 



Simon states that the spiders of this genus are nocturnal; 

 that they live in woodlands, under large stones, between the roots 

 of stumps, and in similar places. The web is large, built near the 

 ground, and resembles that of Tegenaria. 



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