RICHARDSON] TERRESTRIAL ISOPODS OF FAMILY EUBELID.E 237 



in its relation to the apical process of the sixth segment and in the 

 coloration, P. alluaudi being almost uniformly brownish gray, with 

 the borders of the segments red, while the present species is brown, 

 mottled with numerous yellow spots. 



Genus ETHELUM Budde-Lund 



Ethelum Budde-Lund, A Revision of "Crustacea Isopoda Terrestria," pt. 

 1, Eubelum, 1899, p. 24. 



Flagellum of second antenna; composed of two articles. Cox- 

 opodites of first thoracic segment adjacent to and extending along 

 the lateral margin of the segment, being separated from it on either 

 side by a longitudinal groove. The lateral margin of the coxopodite 

 is not sulcate. The coxopodites are cleft posteriorly, a fissure sepa- 

 rating them from the post-lateral angle of the segment. 



Epimera are present on the anterior portion of the underside of 

 the second and third segments in the form of a narrow ridge. 



The outer branch of the uropoda is usually inserted about the mid- 

 dle of the posterior margin of the basal article. 



Analytical Key to the Species or the Genus ETHELUM from Liberia 



a. — Apical process of sixth abdominal segment with extremity rounded. 



b. — Outer branch of the uropoda minute, inserted in a shallow notch at 

 the inner post-lateral angle of the basal article. Without yellow 

 spots on either side of the second and seventh thoracic segments. 



Ethelum rotundatum, sp. now 



b' . — Outer branch of the uropoda not minute, large, inserted in a deep 



notch in the middle of the posterior margin of the basal article. 



With a conspicuous yellow spot on either side of the second and 



seventh thoracic segments Ethelum quadrimaculatum, sp. nov. 



a' . — Apical process of sixth abdominal segment not rounded at the extremity. 



/>. — Apical process of sixth abdominal segment attenuated, in the form of 



a long, narrow process. Coxopodites of first thoracic segment 



shorter than the post-lateral angles. Fifth article of peduncle of 



second antennae one and a half times as long as the fourth article. 



Ethelum attenuatum, sp. nov. 



b'. — Apical process of sixth abdominal segment wide, with extremity 



truncate. Coxopodites of first thoracic segment longer than the 



post-lateral angles of the segment. Fifth article of peduncle of 



second antennae but little longer than the fourth article. 



Ethelum liberiensis, sp. nov. 



ETHELUM ROTUNDATUM, sp. nov. 



Body ovate, convex, contractile into a ball. Surface smooth, 

 punctate. Color, dark brown, with indistinct wavy lines of light 

 brown on either side of the median stripe of dark brown. There 



