﻿162 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loo 



segment shorter than the f ureal rami; endopodite of fifth pair of 

 rudimentary legs in both sexes with a distinct seta on distal end of 

 mesial side in addition to a few hairs on terminal end ; no rounded 

 hyaline protuberance on basipodite of the rudimentary leg of female ; 

 only one large, elongated hyaline process on right basipodite of male ; 

 and spine on segment 15 of right first antenna of male smaller than 

 all the other three spines. 



Description. — Female: Anterior body region ellipsoidal except 

 at posterior end, where the hind edge of the fused fourth-fifth thoracic 

 segments expands into a winglike process with a sensory hair on the 

 tubercle of the distal end. Posterior aspect of thorax asymmetrical 

 to subsymmetrical (fig. 20, a), generally with left side larger and 

 less sinuous than the right. First thoracic segment slightly larger 

 than second ; third equals second ; fourth fused with fifth, at the place 

 of union a hyaline hemispherical prominence arising and extending 

 to the posterior border above the anterior end of the genital segment. 

 Length, exclusive of terminal setae on furcal rami, 1.5 mm. The 

 posterior body region, or abdomen (fig. 20, a, 5), consists of two 

 segments : an anterior genital segment and a posterior anal segment. 

 Genital segment nearly twice as long as the total length of the anal 

 segment and furcal rami together, asymmetrical, right side longer by 

 virtue of its caudad outgrowth or extension on this side over the next 

 segment, anterior half slightly greater in diameter than posterior, 

 carrying one minute sensory hair on each side of the expanded por- 

 tion. Some specimens collected in November carry a single ovisac 

 attached on the ventral side of the posterior portion of the genital 

 segment (fig. 20, h) containing eight eggs (sometimes six) , spermato- 

 phores in the form of two sausages attached near the genital opening 

 above the ovisac. Anal segment shorter than furcal rami, consisting 

 of one single segment only, lateral margins uninterrupted and with- 

 out indication of being developed by fusion of two segments (thus 

 differing from T. hehereri Kiefer, 1929, 1934) ; supraanal plate visible 

 from lateral side. Furcal rami equal, each three-fifths as broad as 

 long, carrying one outer seta (near distal end) , four terminal plumose 

 setae of nearly equal size, 2i/^ times the length of furcal rami, and 

 one inner or dorsal seta, more slender and noded. 



First pair of antennae symmetrical, long, reaching the end of 

 furcal rami, and consisting of 25 joints ; ultimate joint with six setae. 

 Endopodite of maxilliped with five joints. First swimming leg with 

 2-segmented base, 2-segmented endopodite, and 3-segmented expodite ; 

 one seta on distal end of mesial aspect of first basal segment, none on 

 second; one on distal end of inner aspect of first endopodite segment; 

 two along mesial aspect, one on lateral side and three on terminal end 

 of second endopodite segment; first exopodite segment with short 



