224 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vol. 50 



of brown. First two articles of the peduncle of the antennae and 

 the extremities of the fifth articles yellow. 



Head much wider than long, 3 mm. : 10 mm. Front not mar- 

 gined, but continuous with the epistome, which is slightly convex. 

 Eyes small, composite, and situated close to the lateral margin. 

 First pair of antennas inconspicuous and rudimentary. Second pair 

 have the first article short ; the second article is three times as long 

 as the first ; the third is slightly shorter than the second ; the fourth 

 is nearly twice as long as the third ; the fifth is nearly one and a 

 half times as long as the fourth. The flagellum is composed of 

 three articles, the second one of which is the longest. 



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

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

 long. Each of the following segments measures y/ 2 mm. in length. 

 The epimera or coxopodites of the first segment are in the form 

 of a moderately wide and thickened plate on either side, and they 

 are separated from the segment by a groove or suture. They do 

 not extend the entire length of the lateral margin, not reaching the 

 post-lateral angles of the segment by some distance. They are cleft 

 posteriorly, being separated from the segment by a fissure, which is 

 not very deep. The post-lateral angles of the segment are not 

 rounded, but angular, and in the form of a right angle. The cox- 

 opodites of the second and third segments are in the form of a 

 thickened ridge, on the anterior part of the underside of the lateral 

 portion of the segment. This ridge is thicker on the second than 

 on the third segment. 



The first two segments of the abdomen have the lateral parts 

 covered by the seventh thoracic segment. The lateral parts of the 

 three following segments are well developed and are produced back- 

 ward. The third and fourth segments are each a little longer than 

 either one of the first, second, or fifth segments, which are sub- 

 equal. The sixth or terminal segment is triangular at the base and 

 has the apex produced in a long process, with parallel sides and 

 truncate extremity. The length of this segment is 5 mm. The 

 width of the apical process is 2 l / 2 mm. The width of the segment 

 at the base is y l / 2 mm. The basal article of the uropoda occupies 

 all the space between the apical process of the terminal segment 

 and the lateral parts of the preceding segment. It extends to the 

 extremity of the apical process as well as to the extremity of the 

 post-lateral angle of the fifth segment. The posterior margin is 

 notched about the middle for the reception of the outer branch of 

 the uropoda. On either side of the notch the post-lateral angles 



