620 



BULLETIN 54, UNTTED STATES NATIONAL MUSEUM, 



of the second antenna has the inner margin expanded into a spine- 

 like process, which is very conspicuous. The maxilHpeds have a 

 palp of three articles. The palp of the mandibles is wanting. 



Fig. 669.— Porcellio spinicornis (After Sars). a, Head, b. Dorsal view of female, c, Sec- 

 ond ANTENNA, (l, LAST TWO SEGMENTS OF ABDOMEN AND UROPODA. f, FiRST LEG OF FEMALE. 



/", Last segment of abdomen, g, First pleopod of male, h, Uropod. /, Flagellum. j, Sev- 

 enth LEG OF female, k, SECOND PLEOPOD OF MALE. I, SEVENTH LEG OF MALE. 



The first segment of the thorax is 2 nnn. in length, a little longer 

 than any of the others, which are suhecjual and each is li mm. in 

 length. The epimera are not separated oti' f I'om the segments. 



