RICHARDSON] TERRESTRIAL ISOPODS OF FAMILY EUBELID.E 235 



PERISCYPHOPS COOKI, sp. nov. 



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

 tate, with a small pearliform granulation on each side of the thoracic 

 segments. Color dark brown, mottled with yellow in irregular 

 spots all over the body and in no definite arrangement. The flagel- 

 lum and fifth article of the peduncle of the antennae and the cox- 

 opodites of the first thoracic segment are yellow. 



The head is wider than long, 3 mm. : 9 mm., with the frontal 

 margin produced in the middle, sinuate. The front is not mar- 

 gined, but is continuous with the epistome, which is produced in a 

 rounded convexity. The eyes are small, composite, and situated 

 at the lateral margins. The first pair of antennas are small and 

 inconspicuous. The second pair have the first article short ; the 

 second article is twice as long as the first ; the third is about equal 

 in length to the second ; the fourth is one and a half times longer 

 than the third ; the fifth is a little longer than the fourth. The 

 flagellum is composed of three articles, the second of which is 

 longer than either of the other two, which are subequal. 



The first segment of the thorax is about twice as long as any 

 of the following, which are subequal. The first segment is 7 mm. 

 in length. Each of the following segments is 3^ mm. long. The 

 coxopodites of the first segment form a rather wide marginal border 

 on either side, wider anteriorly than posteriorly, very much thickened 

 and separated from the segment by a deep groove. They disap- 

 pear posteriorly and do not reach the post-lateral angles of the 

 segment by some distance. The posterior portion is entire, and not 

 cleft. The coxopodites are not represented on the underside of the 

 segment by any thickness of the margin or any ridge. The coxopo- 

 dites of the second and third segments are present on the anterior 

 portion in the form of a thickened ridge on the underside. 



The first two segments of the abdomen are covered laterally by 

 the seventh thoracic segment. The lateral parts of the following 

 three segments are well developed and are produced backward. The 

 third and fourth segments are longer than either the first, second, 

 or fifth segments, which are subequal. The sixth or terminal 

 segment is triangular at the base and has the apex produced in a 

 moderately wide process, with sides parallel and rounded at the 

 apex. The basal article of the uropoda is quadrangular in shape 

 and occupies all the space between the lateral angles of the fifth 

 segment and the apical process of the sixth segment. It reaches 

 the extremity of the lateral angles of the fifth segment, but does not 



