Tertiary Spiders and Opilinnids. 279 



is about 0.5 mm. The patella is exceedingly short. The tibia 

 together with the patella is 7.5 mm. long. There are two rows 

 of about fourteen spines each on the tibia. These spines are 

 longer than those on the femur, the third spine from the base 



Figure 39. — Lcii of an .h-arlniid. S]R*cimfn No. 4199 (115). x 10. 



measuring i.o mm. Several spines of one of the rows are missing, 

 but their bases of attachment are clearly discernible. The meta- 

 tarsus is slightly curved 2.3 mm. long with two rows of about 20 

 spines each, the spines being very short. The tarsus is only 

 0.7 mm. long, without spines but with two terminal claw^s. Each 

 claw is smooth, but with a basal, short, conical tooth. There is 

 no trace of hair on the leg. 



The leg is plainly not that of an Ilpeira, nor do I know of any 

 spider with an arrangement of spines similar to this, for these 

 spines are distinctly limited to the ventral surface. The other two 

 specimens, now Nos. 114 and 116, are not complete, but ap])arently 

 belong to the same species. 



COCOONS OF SPIDERS. 



Scudder has described and figured cocoons of spiders, referred 

 by him to the species Aranca coluinbiae. (Tertiary Insects, 1890. 

 p. 71, Plate 2, figs. I and 2.) I have not seen his specimens, but 

 judging from his description and figures one would suspect that 

 the cocoons in question belong to more than one species. It would 

 of course be impossible to determine the species. 



