674 BULLETIN ;"i4, UNITED STATES NATIONAL MUSEUM. 



Second pair of antennte strono- and elonofated; tlagollinn niulti- 

 articidate. 



Palp of maxillipeds with joints rather expanded; epignath rounded. 



Uropoda with the basal article not produced inside at the post-lateral 

 angle; branches subeiiual, each tipped with a single terniinal spine. 



ANALYTICAL KEY TO THK SPECIE.S OF THE GENUS LIGYDA. 



a. Uropoda long, equal to t\vo-thir(ls the length of the body or longer. External 

 antennje long, extending the entire length of the thorax or longer. 



h. First pair of legs similar to the others in the male Ligi/da olfersii (Brandt) 



(/. First pair of legs in the male differing from the others. 



c. Propodus of first pair of legs armed with a long narrow process at the distal 



end. Peduncle of second antennae extends to posterior margin of the third 



thoracic segment. The second antennpe extend in the male to the end of 



the body or a little beyond. Body loosely articulated . . Ligyda exotica ( Roux ) 



(/. Propodus of first \mr of legs in male unarujed. Merus and carpus in the fir.st 



pair of legs in the male furnished Avith a row of bristles or stiff hairs. 



Peduncle of second antenna' extends to the posterior margin of the second 



thoracic segment. Second antennte extend in the male to the end of the 



thorax. Body compact Ligyda haudiniana ( Milne Edwards) 



a\ Uropoda not equal to two-thirds the length of the body. 



Ij. Uropoda equal to half the length of the body. Terminal segment of the body 



pointed in the middle Ligyda occidentalis (Dana) 



b^. Urojioda not equal to half the length of the body. Terminal segment rounded 

 in the middle. 

 c. Branches of the uropoda twice as long as the peduncle. Uropoda equal to one- 

 eighth the length of the entire body from the tip of the terminal abdominal 

 segment. Lateral parts of the third, fourth, and fifth segments of the abdo- 

 men with distinct carinse Ligyda pallasi ( Brandt) 



&. Branches of the uropoda four times as long as the peduncle. Uropoda equal to 

 one-fourth the entire length of the body from the tip of the abdomen. 

 Lateral parts of the third, fourth, and fifth segments of the abdomen with- 

 out distinct carin;e Ligyda occanica (Linnanis) 



LIGYDA OLFERSII (Brandt). 



Ligia olfersii Brandt, Bull. Soc. Imp. Naturalistes de Moscou, VI, 1833, p. 11. — 

 BcDDE-LuND, Crust. Isop. Terrestria, 1885, p. 268. — Richardson, Proc. U. S. 

 Nat. Mus., XXIII, 1901, p. 575. 



Localities. — Key West and Puntarasa, Florida; St. Thomas; Brazil. 



Body ol)long-ovate, a little more than twice as long- as wide, 7 mm. : 

 15 mm. Length of uropoda, from tip of terminal segment, S mm. 

 Entire length of body with uropoda 23 nun. 



Head twice as wide as long, 2 mm. : -1 muL Anterior margin widely 

 rounded. Eyes composite, narrow, oblong, twice as long as wide, sit- 

 uated on the lateral margins and extending tdong the anterior margin, 

 being separated in front by a distance a little less than the length of 

 one eye. First pair of antennae inconspicuous and rudimentar\", com- 

 posed of two sulxHpial articles and a minute terminal one and extend- 

 ing only to the end of the first article of the second pair of antennte. 



