40 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvr. 



SYNALPHEUS NOBILII, new species. 



This species is represented only by a single male specimen ; I do 

 not hesitate, however, to consider it distinct from S. fntzmulleri. 

 The differences which separate the two species (comparing two speci- 

 mens of the same sex and of the same size) are the following: 



The carpus of the small chela is more massive, its width exceeding 

 that of the palm (proportion 1.12 instead of 0.9, as in S. fritz- 

 mulleri) . 



The second pair is shorter and thicker, the carpus being six, instead 

 of eight, times as long as wide. Furthermore, the first segment of the 

 carpus is shorter than the sum of the four following. 



Pig. 22. — Svnalpheds nobilii. a, frontal and antennal region; c, carpocerite ; K, 



LARGE chela; k' , SMALL CHELIPED OF FIRST PAIR; ?, FOOT OF SECOND PAIR; Wt, FOOT OF 

 THIRD pair; m', DACTYL OF THIRD PAIR. 



The third pair is much more massive; the relative proportions 

 being; Carpus 1; propodite 1.8; meropodite 2 (instead of 1, 2, 2.33) ; 

 the meropodite is only 2.8 times as long as wide, instead of 4 times, 

 as in S. fritzmiilleri. 



I find no other difference, either in the carpocerite, in the dactyl 

 of the third pair, or in the telson. 



Named for Dr. Joseph Nobili, the carcinologist. 



Locality. — St. Helena, Ecuador, one male specimen, 25 mm. long 

 (M. Festa; Paris Museum). 



I would remind the reader that S. fritzmulleri is represented in 

 the Paris Museum by a specimen from Lower California collected by 



