RICHARDSON] TERRESTRIAL ISOPODS OF FAMILY EUBELID^ 221 



separated from the segment by a longitudinal groove. The lateral 

 margin of the coxopodite is not sulcate. The coxopodites are cleft 

 posteriorly, a fissure separating them from the post-lateral angle 

 of the segment. 



Epimera present on the second and third segments in the form 

 of narrow ridges on the anterior portion of the underside. 



Exopodite of the uropoda inserted about the middle of the pos- 

 terior margin of the quadrangular basal article. 



Analytical Key to the Species oe the Genus MES ARMADILLO from 



Liberia 



a. — Terminal segment of abdomen with apex produced in a process truncate 

 at the extremity. 

 /'. — With a marginal band of yellow surrounding the entire body. Length 

 of apical process of terminal abdominal segment to width in ratio 



of 4^-2 : 2*/2 M esarmadillo flavimarginatus, sp. nov. 



b'. — Without a marginal band of yellow surrounding the entire body. 

 Length of apical process of terminal abdominal segment to width 



in the ratio of 5 : 2 l / 2 M esarmadillo similis, sp. nov. 



a'. — Terminal segment of abdomen with apex produced in a process not trun- 

 cate at the extremity. 

 b. — Terminal segment of abdomen produced in a process which has the 

 sides converging gradually to a triangular extremity. 



M esarmadillo hastatus, sp. nov. 

 b' . — Terminal segment of abdomen produced in a process which has the 

 extremity rounded. 



c. — Third and seventh thoracic segments with a large yellow spot 

 on either side of the lateral margin. Apical process of 

 terminal abdominal segment narrow. 



Mesarmadillo quadricoloratus, sp. nov. 



c'.- — Third and seventh thoracic segments without yellow spots. 



Color mottled, variegated. Apical process of terminal 



abdominal segment broad. .Mesarmadillo variegatus, sp. nov. 



MESARMADILLO FLAVIMARGINATUS, sp. nov. 



Body smooth, minutely punctate, contractile into a ball. Color, dark 

 brown, with the lateral parts of all the segments light brown or 

 yellow, so that a border of light brown completely encircles the body. 

 The median dark area is slightly broken up on either side of the 

 median longitudinal line by rather indistinct wavy lines of the lighter 

 color. There is a small pearliform granulation on either side of 

 each one of the thoracic segments. 



The head is much wider than long, 3^ mm. : 10 mm. The frontal 

 margin is straight. The eyes are small, round, composite, and situ- 

 ated at the lateral margins. The front of the head is not margined, 



