66 



Alexander Petrunkevitch , 



ments preserved as shown in text figure 25. Notwithstanding the 

 differences in the shape of the pedipalpi, of the coxae of the first pair 

 of legs and of the last three abdominal segments, the similarity in 

 size and structure between the cotype and type is so great, that I am 

 rather inclined to attribute the differences to sexual dimorphism 

 than to make a separate species of the cotype. 



Foundin the Pennsylvanic(Lower Allegheny) of Mazon Creek, Illinois. 



Sub-Order Amblypygi. 



Family Tarantulidae Karsch. 



Thelyphrynus n. gen. 



Cephalothorax wider than long, bean-shaped. Eyes absent. 



Coxae of third and fourth pair contiguous, not triangular. Genotype 



T. elongaius n. sp. 



Thelyphrynus elongatus n. sp. 

 Plate V, fig. 26; text figs. 27, 28. 



Fig. 28. 



Figure 27. — Thelyphrynus 

 elongaius n. sp., holotype, 

 Daniels coll., ventral sur- 

 face. Figure 28. — Same, 

 cephalothorax. X -r- 



The type and only 

 specimen of this species, 

 showing only the re- 

 verse, is in the collection 

 of Mr. L. E. Daniels. 

 It shows the pedipalpi, 

 trochanters and femora 

 of the second pair of 

 legs, trochanters, fe- 

 mora and patellae of 

 the third pair, an almost 

 complete fourth leg, 

 faint impressions of the coxae[of the third and fourth pair, complete 

 abdomen and superimposed over the coxae the cephalothorax. 



Fig. 27. 



