444 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



The two joints of the first antennae of the same length, but the 

 terminal one much the narrower. Second antennae of good size, with 

 a stout terminal claw. First maxilla? nearly as long as the terminal 

 claw of the second antennae and consisting of a very short basal por- 

 tion which is not enlarged, and a long terminal claw, of the same 

 width throughout and bluntly rounded at the tip. Second maxillae 

 considerably enlarged at the base, the terminal half divided into two 

 branches, of which the outer one is longer and wider than the inner. 

 Second maxillipeds with a long and moderately swollen basal joint, 

 without spines or projections, and a terminal claw half the length of 

 the basal joint, stout at the base but tapering to a slender and sharp 

 point. 



Furca short and very stout, the basal portion trapezoidal, the pos- 

 terior corners of the trapezoid forming triangular projections on 

 either side, the terminal portion elliptical, cut a little beyond the 

 center, the branches nearly parallel, much flattened and bluntly 

 rounded, the central sinus wide and squarely cut at its base. 



Swimming legs of the usual pattern ; the three terminal claws on 

 the tip of the first pair diminish regularly in size from in front back- 

 wards; the rami of the third pair are close together and the basal 

 joint of the exopod with its claw is exceptionally large. The fourth 

 legs are four- jointed, the basal joint stout and two-thirds as long as 

 the other three, the claw on the second joint minute and blunt, while 

 the three, terminal claws are turned outward nearly at right angles 

 to the joint itself, the two inner ones being more than three times as 

 long as the outer one. The sixth legs appear as good sized papilhe 

 on the ventral surface of the genital segment close to the bases of the 

 egg strings ; each is armed with three setae on its outer margin. 



Total length, 6.G mm. Length of carapace, 3.8 mm. ; of genital 

 segment, 1.7 mm. ; of abdomen, 1 mm. ; of egg strings, 4.4 mm. Width 

 of carapace, 3.8 mm.; of genital segment, 1.5 mm. 



Color (preserved material). — A pale yellowish white, without pig- 

 ment of any sort ; egg strings a deeper yellow. 



(constrictus, contracted, alluding to the narrowed fourth segment.) 



LEPEOPHTHEIRUS INSIGNIS, new species. 



Plates LXX, LXXI. 



Host and record of specimens. — A large number of both sexes of 

 this species were obtained by Doctor McClendon from a sunfish, 

 Mola mola, off the coast of Southern California. About a dozen of 

 the best specimens have been selected and are Cat. No. 32814, 

 U.S.N.M., types of the species. There are also cotypes in the Mu- 

 seum of the University of California. 



Female. — Carapace orbicular, a trifle wider than long; lateral areas 

 wide, each about one-third the entire width ; posterior corners broadly 



