ISOPODS OF NORTH AMERICA. 617 



extends a short distance beyond the terminal segment of the body; 

 outer branch extends but very little beyond the inner branch. 



One specimen was collected by Prof. A. E. Verrill at the Bermudas 

 in 1901. 



Type specimen in Peabody Museum, Yale University. Cat. No. 

 3353. 



PORCELLIO RATHKEI Brandt. 



Porcellio rathkei BRANDT, Bull, de la soc. Imp. d. Naturalistes de Moscou, VI, 



1833, p. 15. MILNE EDWARDS, Hist. Nat. des Crust., Ill, 1840, p. 170. 

 Porcellio ferrugineus BRANDT, Bull, de la soc. Imp. d. Naturalistes de Moscou, VI, 



1833, p. 16. MILNE EDWARDS, Hist. Nat. des Crust., Ill, 1840, p. 170. 

 Porcellio trilineatus KOCH, Deutschl. Crust., 1835-1844, p. 34. 

 Porcellio trivittatus LEREBOULLET, Me'm. de la Soc. de museum nat. de Strasbourg, 



IV, 1853, p. 54, pi. i, figs. 13, 14; pi. HI, figs. 66-70. 



Porcellio tetramoerus SCHNITZLER, De Oniscineis agri. Bonnensis, 1853, p. 24. 

 Porcellio striatus SCHNITZLER, De Oniscineis agri. Bonneneis, 1853, p. 24. 

 Porcellio trilineatus SILL, Verhandl. u. Mittheilungen des Siebenbiirgischen 



Vereins fur Naturwissenschaften zu Hermannstadt, XIII, 1862, p. 26. 

 Porcellio trivittatus Jonysoy, Academisk Afhandling, TJpsala, 1858, p. 25. 

 Porcellio trilineatus BUDDE-LUND, Nat. Tidsskr. (3), VII, 1870, p. 239. STUX- 



BERG, Ofvers. af Kgl. Vetenskaps Akad. Forh., 1875, p. 59. 

 Porcellio rathkei BUDDE-LUND, Crust. Isop. Terrestria, 1885, pp. 85-87. (See 



Budde-Lund for synonymy). SARS, Crust, of Norway, II, 1899, pp. 180-181, 



pi. LXXIX, fig. 1. RICHARDSON, Amer. Nat., XXXIV, 1900, p. 304; Proc. 



U. S. Nat. Mus., XXIII, 1900, p. 567. PAULMIER, Bull. New York State 



Museum, 1905, pp. 182-183. 



Localities. Springfield, Ohio; Lockland, Ohio; Columbus, Ohio; 

 Clifton, Cincinnati, Ohio; Chaumont, New York; Syracuse, New 

 York; St. Marys, Georgia; Salem and Beverly, Massachusetts; Lake 

 Champlain; New York City; Lawrence, Massachusetts; Washington, 

 District of Columbia; Saginaw, Michigan; Freeport, Maine; Victoria, 

 Texas; Providence, Rhode Island; also Europe. 



Found in woodsheds, greenhouses, on rotten logs, under brick and 

 boards, under logs, at river bottom. 



Body oblong-ovate, a little more than twice as long as wide, 5 mm. : 

 10i mm. 



Head about twice as wide as long, 1 mm. : 2 mm., with the anterior 

 margin produced in three lobes, the median one being less produced 

 than the lateral lobes and all having rounded extremities. The eyes 

 are small, composite, and situated at the base of the antero-lateral 

 lobes. The first pair of antennae are small and inconspicuous and are 

 composed of only two articles. The second pair of antennai have the 

 first article short; the second about one and a half times as long as the 

 first; the third equal in length to the second; the fourth twice as long 

 as the third; the fifth one and a half times as long as the fourth. The 

 flagellum is composed of two subequal articles. The second antennae 

 extend to the posterior margin of the third thoracic segment. 



