4 .^PROCEEDINGS OF THE KatIONAL MUSEUM vol.73 



terior portions in the ratio of 5 to 4, genital segment distinctly 

 divided in front of the center, both portions the same width, abdo- 

 men with four segments between the genital segment and furca. 

 Segments diminishing considerably in length backward, but only 

 slightly in width. Furca about the same length as the anal segment 

 and like that of the female. First antennae symmetrical, geniculate, 

 terminal portion consisting of the last two joints. Aesthetasc rela- 

 tively larger than in the female. Appendages corresponding to those 

 of the female. 



Total length, 0.70 millimeter. Greatest width, 0.22 millimeter. 



Adult female. — Body of female creamy white and fairly transparent. 

 The ovaries and convoluted oviduct of a dark brown color and show- 

 ing distinctly through the dorsal integument. Body moderately 

 slender, the anterior division quite regularly oval in outline and 

 about twice as long as wide, evenly rounded anteriorly and posteri- 

 orly, posterior division considerably less than half the anterior in 

 both length and width. Genital segment distinctly divided at the 

 center, the anterior half swollen laterally, the posterior half with 

 straight lateral margins. Furcal rami longer than the anal segment, 

 outer and inner apical setae short and bent at the base. Anterior 

 antennae long and tapered distally, the second joint longer than the 

 third, the fourth a trifle shorter than the third, terminal portion 

 about twice the length of the fourth joint. Mandible with three 

 proximal teeth increasing in size distally, and a row of five small 

 distal teeth all about the same size; palp distinctly biramose, each 

 ramus tipped with long and stout setae. First maxillae with no 

 epipodal lobe and the palp not lobular, both maxillae and the palp 

 tipped with a tuft of setae. Second maxillae with a curved terminal 

 claw longer than the swollen basal joint and a long slender seta at 

 the base, claw on the inner side. Maxilliped not as stout as second 

 maxilla, its second joint armed with a short spine at the center of 

 the outer margin, and a row of stiff bristles along the inner margin, 

 terminal claw shorter than the second joint and slightly curved with 

 a slender seta inside at its base. First legs with the endopod rather 

 slender and nearly twice the length of the exopod, the second joint 

 slightly longer than the basal one, the terminal joint nearly spherical 

 and tipped with two small claws without plumes, claws on the 

 second and third joints of the exopods showing distinctly at their 

 tips, as well as the tufts of plumes characteristic of this genus. Fifth 

 legs with a short basal joint not much widened, its inner expansion 

 tipped with a long seta and two very short ones, terminal joint broad 

 and lamellate, its width two-fifths of its length, with a very stout spine 

 just beyond the center of the outer margin, three terminal setae, the 

 central one the longest, and a minute spine on the outer margin near 

 the tip. 



