NO. 2123. CRUSTACEA. COLLECTED IN COLOMBIA— PEARSE. 551 



(46, 30, 42.3 mm. in length) carrying eggs taken on August 8 and 14. 

 This species ranges from Texas to Brazil. Its distribution in Colombia 

 is apparently different from other shrimps and prawns. 



MACROBRACmUM JAMAICENSE (Herbst). 



This species was quite common m the streams near "La Rosa" 

 (fig. 1). The 20 specimens collected were secured in the streams 

 along the margins under leaves, among vegetation, and under stones. 

 Two females carrying eggs were taken June 30. They measured 143 

 and 130.5 mm. in length. This species ranges from Texas to Rio de 

 Janeiro and is also found on the Pacific slope. 



ATYA SCABRA Leach. 



This peculiar shrimp was quite common in the swift streams flowing 

 among bowlders over sandy bottoms near "La Rosa." It was found 

 among or under bunches of dead leaves which had accumulated 

 against sticks or stones. Females carrying eggs were often met 

 during the first week in August. The largest of these measured 

 62 mm. in length; the smallest, 26 mm. Of the 79 specimens col- 

 lected, the largest was 64.5 mm. long. This species is widely dis- 

 tributed, being found from Mexico to Venezuela and in West Africa. 



PENEUS BRASILIENSIS LatreiUe. 



A shrimp which is abundant in the Cienaga Grande. A number 

 were purchased from a fisherman at Puerto Viejo. Most of them 

 measured about 80 cm. long. They have 10 (9) rostral spines and 

 the antennular peduncle slightly exceeds the tip of the rostrum. 

 This species is found from Massachusetts to Brazil and has also been 

 reported from West Africa. 



COENOBITA DIOGENES Milne-Edwards. 



On August 29 Doctor Ruthven came upon a great drove of these her- 

 mit crabs apparently migrating away from the ocean through the des- 

 ert near Santa Marta. His attention was first attracted by the noise 

 they made as they scratched along among the loose bowlders, sticks, 

 and dry leaves. It was estimated that about 500 individuals were 

 moving over an area about 200 meters square. Eleven specimens 

 were preserved. All were females and eight were carrying eggs. 

 The range of this crab extends from West Africa, through the West 

 Indies to the Pacific Islands. Three specimens brought back alive 

 have lived in the vivarium at the University of Wisconsin for a year. 



TRICHODACTYLUS (DELOCARCINUS) DENTATUS (Randall). 



This crab was common around the edge of swamps and in pools 

 and intermittent streams at Fundacion. Near swamps they were 

 often found in burrows under logs. These holes sometimes reached 

 a depth of 20 cm. and often had no water in them. In the creeks the 

 crabs were usually found under sticks or loose stones. The largest 



