NO. 2123. CRUSTACEA COLLECTED IN COLOMBIA— PEARSE. 



549 



This isopod was found tuider stones and logs in the forest about 

 the Cincinnati Coffee Plantation, but was not common. Females 

 carrying young were collected on July 3 and 12. 



LIGYDA RICHARDSONAE, new species. 



Cotype. — Cat. No. 45721, Museum of Zoology, University of Michi- 

 gan. Cat. No. 47948, U.S.N.M. Collected at Cincinnati Coffee 

 Plantation, Sierra Nevada de Santa Marta, Colombia, 3,800 feet ele- 

 vation, by A. S. Pearse, July 3, 1913. Orig. No. 18. 



Body oblong-ovate, nearly three times as long as wide, 5.5 by 18.3 

 mm. Specimens measured vary in length from 13.3 to 18.3 mm. 



Fig. 9. — LiGTDA richaedsonae. a, antenna; c, copulatory organ; I, first leg of male; m, first 



maxilla; mp, maxilliped. 



Color, mostly gray with a broad light band at the sides of the thorax ; 

 sometimes a few white spots along the posterior borders of thoracic 

 segments; usually a broad rather indistinct darker band along median 

 dorsal line. Uropoda 6.2+ mm. long (broken), slender. Dorsal 

 surface of body smooth with a few scattered minute hairs. Head 

 twice as wide as long, 4 by 1.7 mm. ; anterior margin arcuate. Eyes 

 elhptical; truncate on median margin; space between eyes in front 

 more than greatest diameter of one eye; length of one eye, 1.2 mm. 



