100 Proceedings of the Biological Society of Washington. 



jnv., Orig. No. 25, Cat. No. 45,720. In forest south of Cincinnati 

 Coffee Plantation, under stones in dry creek bed, A. S. Pearse, July 5, 

 1913, 1 c? 2 9 , Orig. No. 40, Cat. No. 45,861. South of Cincinnati 

 Coffee Plantation, 4000 feet, under stones, F. M. Gaige, July 5, 1913, 

 2 9 , Orig. No. 46, Cat. No. 45,867. Santa Marta Mountains, 4600 feet, 

 under logs in forest, A. G. Ruthven, July 7, 1913, 2 9 , Orig. No. 55, 

 Cat. No. 45,717. Cincinnati Coffee Plantation, 4500 feet, from brooklet, 

 M. A. Carriker, July 10, 1913, 1 c? holotype, Orig. No. 75, Cat. No. 

 45,864. Cincinnati Coffee Plantation, 4200 feet, in creek, Clara Flye, 

 July 26, 1913, 1 9 , Orig. No. 183, Cat. No. 45,728. 



Pseudothelphusa ruthveni sp. nov. 



Holotype. — Adult female, Cat. No. 45,716, Museum of Zoology, Uni- 

 versity of Michigan, Ann Arbor, Michigan. Collected at south end of 

 Cincinnati Coffee Plantation, Santa Marta Mountains, Colombia, 2500 

 feet elevation, by Dr. A. G. Ruthven, July 4, 1913, Orig. No. 33. 



Measurements. — Holotype female, length of carapace on the median 

 line 19.8 mm., width of carapace 35 mm., width between outer angles of 

 orbits 21 mm., width of front above, between the eyes, 9.7 mm., length 

 of larger propodus below 26 mm., greatest height of palm (near middle) 

 9 mm., greatest thickness of palm 6.4 mm., length of dactylus of cheliped 

 14.6 mm. 



Description. — The dorsal aspect is much like that of P. clausa. The 

 size is greater, the punctae are proportionally larger, lateral teeth more 

 prominent and surface near them rougher; cervical suture more sinuous, 

 epigastric lobes higher. Front trilobate, middle lobe lower down than 

 lateral lobes. Orifice of efferent branchial channel closed and similar to 

 that of P. pearsei, the jugal angle being prolonged in a spine which meets 

 the lateral tooth of the epistome. Outer margin of merus of maxilliped 

 nearly straight up to the articulation with the carpus; sides of ischium 

 subparallel; exognath reaching very nearly to end of ischium. 



Fingers longer and slenderer in proportion to palm than in clausa; 

 larger prehensile teeth narrower and more separated than in clausa, most 

 noticeable in the smaller chela. 



