A NEW TERRESTRIAL ISOPOD FROM GUATEMALA, THE 

 TYPE OF A NEW GENUS. 



By Harriet Richardson, 



Collaborator, Division of Marine Invertebrates, U. S. National Museum. 



The following description is of a new isopod which was collected 

 by Messrs. E. A. Schwarz and H. S. Barber, in the spring of 1906, 

 at Livingston, Guatemala, and is now deposited in the United States 

 National Museum. The single specimen found is the type of a new 

 genus. 



Description. — Head margined in front. Frontal margin straight. 

 Epistome with a slight shield-like convexity. Flagellum of second 

 pair of antennae composed of three articles. Eyes absent. 



First thoracic segment with the epimera or coxopodites on the 

 underside, extending almost the entire length of the lateral margin 

 in the form of a wide band, not reaching the posterior margin of the 

 segment and being cleft posteriorly by a rather deep fissure. The 

 position and form of the coxopodite gives the lateral margin of the 

 segment a thickened appearance. The epimera or coxopodites are not 

 present on any of the following segments. 



The terminal abdominal segment is triangular, with the apex 

 obtusely rounded. The basal article of the uropoda is quadrangular, 

 broader than long, not reaching beyond the lateral parts of the fifth 

 abdominal segment, but extending considerably beyond the apex of 

 the terminal abdominal segment. The inner branch extends consider- 

 ably beyond the apex of the sixth abdominal segment and reaches a 

 little beyond the inner post-lateral angle of the basal article of the 

 uropoda. The outer branch is inserted in a notch about the middle of 

 the inner lateral margin of the basal article and occupies a lateral 

 position. 



Type of genus. — SpJier armadillo schwarzi. 



Family ARMADILLIDIDiE . 



SPHER^RMADILLO, new genus. 



Proceedings U. S. National Museum, Vol. XXXII— No. 1535. 



447 



Proc. N. M. vol. xxxii-07 29 



