NO. 2253. DESCRIPTIONS OF TEN NEW ISOPODS— BOONE. 597 



formations. A broad, median dorsal black band extends the length 

 of the body; followed on either side by a narrower creamy band, 

 then a broader black band which widens posteriorly extending to the 

 extreme lateral margin from the fifth thoracic backward ; the lateral 

 margins of the head and first three thoracic segments are tipped 

 with cream color. 



Head wider than long, 3.5 mm., 2.5 mm., anterolateral margin oval; 

 median posterior margin oval, less curved postlaterally. Eyes very 

 feeble, located in postlatcral angles of head. The antennae are short 

 and attached so far on the ventral surface of the head that they 

 are scarcely visible dorsally. The first pair consist of eight, short, 

 stout, subequal articles and extend almost to the middle of the first 

 thoracic segment. The antennae are similar but slightly longer, con- 

 sisting of ten articles. Mandibles small, with a palp of three articles. 

 First maxillae with outer lobe slender, tipped with small spines; 

 inner lobe feeble. Maxilliped with palp of two articles. 



Thorax: First segment 2.5 mm. long, anterior margin excavated, 

 anterolateral angles bluntly produced beyond the angles of the head ; 

 second, three-fifths as long as first; third, a little less than second; 

 fourth as long as second; fifth and sixth slightly longer than the 

 fourth ; seventh slightly less than sixth. Epimera perfectly coalesced 

 with segments, line of fusion wanting; the lateral parts widely ex- 

 panded and produced distally into an acute, roughly triangular 

 process with apex directed posteriorly. Legs : Seven pairs, subequal, 

 strongly prehensile, similar in structure. The first joint strongly 

 produced into a curious wing-like process, which is roughly tri- 

 angular with acute apex directed outwardly and posteriorly; this 

 process on the first leg fused with the first thoracic segment, those 

 of second to seventh legs, inclusive, distinct ; those of the second and 

 third legs are so produced as to be conspicuous on the dorsal side; 

 the second process equals in length the produced extremity of the sec- 

 ond segment; the third is slightly less than the extremity of the 

 third segment; the fourth to seventh, inclusive, are not visible 

 dorsally; the fourth and fifth are stout and not quite so long as the 

 third ; the sixth is slenderer and longer than the fifth ; the seventh is 

 slender and quite pointed; the second joint of the leg is very small; 

 the third is the longest with unique basal curvature adapted to 

 sculpture of the first joint; the fifth is slightly longer than the 

 fourth ; the sixth is a strongly curved claw folding over on the fifth, 

 with a tip reaching the basal part of the fifth joint. 



Abdomen : This consists of six segments, the first of which is hid- 

 den, except the postlateral extremity, by the thorax; the second, 

 third, fourth, and fifth segments are subequal, about 1 mm. long; 

 they are decidedly curved posteriorly and overlap each other, the 

 postlateral angles are acutely produced, the sixth segment is shield- 



