ISOPODS OF NORTH AMERICA. 



I. Uropoda much longer than caudal segment; inner branch narrow, obtuse, much 

 shorter than outer branch. Epimera of last two thoracic segments not longer 

 than segments Livoneca redmanni Leach 



V . Uropoda hardly surpassing the caudal segment; both branches equal in length. 

 Epimera of last two segments of thorax surpassing the segments. 



Livoneca ovalis (Say) 



LIVONECA PANAMENSIS Schioedte and Meinert. 



Livoneca panamensis SCHIOSDTE and MEINERT, Naturhistorisk Tidsskrift (3), XIV, 

 1883-84, pp. 349-353, p.'xm, figs. 11-12. RICHARDSON, Proc. U. S. Nat. 

 Mus., XXI, 1899, p. 830; Ann. Mag. Nat. Hist. (7), IV, 1899, p. 172. 



Localities. Mazatlan; west shores of Central America; Panama. 

 Body ovate, less than twice as long as wide, 16 



a 



mm.: 2< mm. 



Head quadrangular, wider than long, 3 mm. : 4 

 mm., with the anterior margin truncate and about 

 2 mm. wide. The eyes are small and distinct and 

 situated at the sides of the head near the posterior 

 margin. The first pair of antennae are separated 

 in front by a distance of 1 mm. They are com- 

 posed of eight articles, and extend to the posterior 

 margin of the head. The second pair of antennge 

 are composed of ten articles and extend to the 

 middle of the first thoracic segment. 



The first segment of the thorax has the antero- 

 lateral angles produced to surround the head, 

 where they extend to the middle of the lateral mar- 

 gin. The first segment is 4 mm. in length. The 

 second and third are subequal and each is 3 mm. 

 long. The fourth and fifth are subequal and each 

 is 2 mm. in length. The sixth is 2 mm. long. 

 The seventh is li mm. The epimera of all the 

 segments, with the exception of the first, are dis- 

 tinctly separated from the segments. The epimera 

 extend the full length of the lateral margins, with 

 the exception of those of the fifth and sixth seg- 

 ments, which do not quite reach the posterior 

 margins of the segments. 



The abdomen is slightly immersed or se.t in the 

 thorax. The first segment is entirely covered by 

 the seventh thoracic segment except in the dorsal 

 portion. All the segments are distinct. The sixth 

 or terminal segment is large, nearly twice as wide 

 as long, 6 mm.: 10 mm., and has the posterior margin irregularly 

 rounded. The uropoda have both branches similar in shape and size 

 and of equal length. They are long and narrow with posterior 

 2858905 17 



FIG. 265. LIVONECA PAN- 

 AMENSIS (AFTER SCHI- 

 (EDTE AND MEINEKT). 

 a, ADULT MALE. 6, LAT- 

 ERAL VIEW OF THORAX 



OF ADULT FEMALE. C, 

 LATERAL VIEW OF THO- 

 RAX OF ADULT MALE. 



d, ADULT FEMALE. (ALL 



ENLARGED.) 



