NO. 2123. CRUSTACEA COLLECTED IN COLOMBIA— PEARSE. 



553 



PSEUDOTHELPHUSA RUTHVENI Rathbun. 



Plate 73. 



PseudothelphiLsa ruthveni Rathbun, Proc. Biol. Soc. Washington, vol. 28, 1915, 

 p. 100. 



An adult female of this species was collected at the south end of the 

 Cincinnati Coffee Plantation (2,500 feet). 



CALLINECTES ORNATUS Ordway. 



Parts of shells left by raccoons or herons were common in the man- 

 grove swamps at Punta Gruesa along the Cienaga Grande. This spe- 

 cies ranges from South Carolina to Brazil and is also found in the 

 Bermudas. 



SESARMA ROBERT! Milne Edwards. 



These crabs had burrows among the mangroves at Punta Gruesa. 

 They walked about over the roots or climbed in the trees. Three 

 specimens were taken which show the following measurements in 

 millimeters : 



This species is found throughout the West Indies and in Africa. 



GRAPSUS'GRAPSUS (Linnaeus). 



Common on the rocks along the ocean at Santa Marta. 

 throughout the Tropics. 



CARDISOMA GUANHUMI Latreille. 



Range, 



The holes of these great crabs were abundant on the clay flats at 

 the mouth of the Manzanares River at Santa Marta. They were also 

 common in holes about the roots of trees along the Gaira River at 

 Gaira. Shells and claws from crabs of this species were picked up 

 in the mangrove swamp at Punta Gruesa. 



At the mouth of the Manzanares a careful study was made of the 

 habits of Cardisoma. At night the crabs came forth in hordes, 

 walked about everywhere over the flats, and climbed into the trees. 

 One was seen in a tree 10 feet from the ground. In feeding the 

 females and smaller males go about sifting the mud between both 

 chelae, but do not pass every ''handful" they grasp up to the mouth. 

 The big males use only the smaller claw. Several times crabs were 

 seen to eat fallen leaves from trees. One would take a leaf in his 

 claw and start nibbling at one end, and this was continued until the 

 whole leaf had disappeared. 



