1923] Rathbun, Brachyuran Crabs of West Coast of Mexico 637 



Cape San Lucas; 3 rnegalopa, 5.5 mm. long. (See PI. XXXIV, figs. 3-5.) 

 Cape San Lucas, ship's anchorage, taken by electric light; 5 megalopa. 



The larvae show (PI. XXXIV, fig. 5) the humped movable finger peculiar 

 to S. magdalenense (PI. XXXII). 



Grapsoid. A pair of pigment spots on each abdominal somite. 

 Point San Bartholome; one megalops. 

 Benito Island; 6 megalopa, 5 mm. long. (See PI. XXXV, figs. 4-6.) 



Grapsoid, different from the preceding. Body thick, color reddish in 

 alcohol, speckled. 

 Cape San Lucas; 20 megalopa, 2.3 mm. long. (See PI. XXXV, figs. 1-3.) 

 Libinia setosa 



Cape San Lucas; 4 megalopa, 3.15 mm. long. (See PI. XXXVI, fig. 1.) Dr. 

 Fish says that this is very similar to an Atlantic species of Libinia, the 

 rostrum of which is more pointed. The only Libinia known from Cape San 

 Lucas is L. setosa. Another Mexican form, L. mexicana, has been taken 

 onlv at the extreme head of the Gulf of California. 



