432 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 91 



Chilean species by Girard (1855, p. 255) and which species, by the way, 

 seems never to have been taken again. 



On my first visit to South America, in the fall of 192G, under the 

 auspices of the Walter Rathbone Bacon Scholarship of the Smith- 

 sonian Institution, I planned to obtain additional specimens of A. 

 odehrechtii. I thought I was successful at Castro, Parana, Brazil, 

 but the specimens I got there, however much they may superficially 

 resemble A. odehrechtii, are another species (castro), named in this 

 paper. 



En route to Castro, I stopped in Rio Negro. Here, with the help 

 of Carlos Zornig, at whose hotel I stayed, and with baited wicker 

 fish traps that he provided, I caught several large Aeglas. One of 

 these is the largest representative of the genus ever to be taken, 

 measuring approximately 44 mm. in length of carapace and rostrum 

 together. It is the type of the species parana, which I am naming 

 for the State in which it was found. 



Although I was chiefly interested in procuring marine decapods at 

 the time, I did not neglect looking for Aeglas as opportunities arose. 

 In that verdant park, the Prado, at Montevideo, Uruguay, Juan 

 Tremoleras and I collected a lot of small x^eglas from one of the 

 smaller watercourses. These, too, proved new, and are named prado 

 in commemoration of the place and occasion of their capture. 



Wlien Dr. Martin Doello-Jurado, director of the Museu Argentino 

 de Ciencias Naturales, learned of my interest in Aegla, he most gen- 

 erously took me on an all-day excursion to the delightful resort of 

 Tigre. Here numbers of smaller specimens of a hitherto unrecog- 

 nized species were found. This species {uruguayana) , however, I 

 have described from a larger, more fully developed specimen from San 

 Carlos, Uruguay, belonging to the Field Museum of Natural History 

 in Chicago. Dr. Doello-Jurado also kindly granted a loan of his 

 museum's collection of these crustaceans. Without this great help, 

 this paper could scarcely have been written, for in that fine collection, 

 along with representatives of several other species, are the holotypes 

 of four of the new species herein described: sanlorenzo, jujuyana, 

 afflnis, and humahimca. 



At Concepcion, Chile, January 1927, the director of the Concepcion 

 Museum, Dr. Carlos Oliver Schneider, Carl Junge, and I made a very 

 successful haul of Aeglas on the outskirts of town. These formed 

 the basis of A. concepcionensis. 



In the course of an examination of the crustacean collections of 

 the Field Museum, two new species of Aegla were located, one 

 {papudo) from Papudo, Chile, and one {uruguayana) from San 

 Carlos, Uruguay, a species already referred to above. 



