ARACHNIDES— ARANEIDES— 0RBITP:LARI^. 89 



of legs, which appear nearly to equal the fourth. It is impossible to say to 



what sex it belongs. 



Length of first pair of legs, 5.5°"" ; of third pair, 7™'" ; tibia, 2™'" ; tarsi, 



2.5™'" ; of femora and tibia of fourth pair, 4'"'" ; width o^' its femora, 0.7"" ; 



length of its tibia, 2"". 



• Florissant. No. 9285. 



Epeira sp. 



Several specimens represent legs of the same or allied species of spider 

 of about the size of Epeira riparia Hentz ; the femora and tibiaj and tlie 

 sides of the tarsi are abundantly supplied with longitudinal rows of fine, 

 long, black spines, the claw double. Another preserves the spines alone 

 of the same sort of leg. 



Length of femora, 7"™; of tibife, 7.75""; of tarsi, 3.25"™; of claw, 

 0.3"" ; of spines, 0.75"". 



Green River, Wyoming. Nos. 3, 4% 36, 4199, 4200. 



Epeira sp. 



Still another, from the same locality as the last, shows the hairy, sub- 

 fusiform, ovate body of a spider apparently a little smaller than the above. 

 Length of abdomen, 4.5""; breadth of same, 1.8"". 

 Green River, Wyoming. No. 63. 



Nephila Leach. 



This interesting tropical genus has never before been found fossil, and 

 altliough the species here described differs considerably from any witli 

 which I have been able to compare it, it is interesting to see some special 

 points of comparison with a common species of our Southern States, as will 

 be noticed further on. Its presence at Florissant decidedly indicates a 

 warmer climate than the present, though not necessarily one much warmer 



Nephila pennatipes. 



PL 11, Fig. 12. 

 Nephila pennatipes Scudder, Zittel, Haiulb. d. Paheout., I, ii, 744, Fig. 926 (1885). 



Cephalic portion of corselet square, with rounded angles, the front 

 margin slightly excised in the middle ; two eyes only can be made out, 

 situated posterior to the front margin by nearly their own diameter, of 

 moderate size, less than one-fourth the width of the terminal joint of the 

 palpus, and placed rather nearer the middle line than the outer edge of the 

 body. Palpi stout, not very long, bluntly rounded at tip and extending in 



