A NEW GUATEMALA ISOPOD— RICHARDSON. 449 



ened appearance to the lateral margin. Epimera are not present on 

 any of the following thoracic segments. 



The first segment of the abdomen is the longest, being 3 mm. in 

 length. The two following segments are siibequal and each is 2 mm. 

 long. The next two segments, the fourth and fifth, are subeqnal and 

 each is 1.5 mm. in length. The first two segments are covered laterally 

 by the seventh thoracic segment. The sixth or terminal segment is 

 triangular in shape. It is 9 mm. wide at the base and 4 mm. long in the 

 median longitudinal line. The apex is obtusely rounded. The basal 

 article of the uropoda occupies all the space between the terminal seg- 

 ment of the abdomen and the produced lateral parts of the fifth 

 segment. It does not extend beyond the lateral parts of the fifth 

 segment, but extends considerably beyond the apex of the triangular 

 terminal segment. In shape it is quadrangular, broader than long, 

 with the inner anterior part covered by the apical portion of the 

 terminal abdominal segment. The inner branch of the uropoda ex- 

 tends considerably beyond the apex of the terminal abdominal seg- 

 ment and a little beyond the inner post-lateral angle of the basal 

 article. The outer branch is inserted in a deep notch about the mid- 

 dle of the inner lateral margin of the basal article. This branch lies 

 in a lateral position. 



All the legs are ambulatory. 



The type and only specimen was collected at Livingston, Guatemala, 

 by Messrs. E. A. Schwarz and H. S. Barber, in April, 1906, and is in the 

 U. S. National Museum. Cat. No. 33471 . 



This genus is perhaps more closely related to Sphxroniscus Ger- 

 stsecker than to any other genus of the Ai'madillididse, these two being 

 the only genera of that family in wdiich the flagellum of the second 

 antennae is composed of three articles. SpJierarmadillo schwarzi 

 more closely resembles Sphxroniscus portoricensis Richardson "■ than 

 the other species of that genus in the shape of the terminal abdominal 

 segment, the basal article of the uropoda, and the form and posi- 

 tion of the inner branch. It differs, however, from that species 

 in the absence of eyes, the presence of distinct coxopodites on the 

 underside of the first thoracic segment, and in the form and posi- 

 tion of the outer branch of the uropoda. Tliis branch is inserted in a 

 notch in the middle of the inner lateral margin of the basal article, 

 and it is this character which distinguishes it from all the species 

 belonging to the genus Sphxroniscus. 



This genus also resembles Synarmadillo Dollfus '' in the form of the 



oProc. U. S. National Musf'um, XXIII, 190], p. 57:V. Bull. U. S. National Musfuin, 

 No. 54, 1905, pp. 662-663. 



b Ann. Soc. Entomologiquc de France, LXI, 1892, pp. 388-389, pi. vii, iig. 4. 



