No, 26.] ARTHROSTRACA OF CONNECTICUT. 



Porcellio scaber Latreille. 



245 



Fig. 80. Porcellio scaber. 



1818. Porcellio nigra, Say, Jour. Acad. Nat. Sci. Phila., 

 vol. I, p. 432. 



1853. Porcellio gemmulatus, Dana, U. S. Expl. Exped., vol. 

 14, p. 725, pi. 47. 



1899. Porcellio scaber, G. O. Sars, Crust. Norway, vol. 2, 

 p. 176, pi. 77. 



1902. Porcellio scaber, Stoller, 54th Rept. N. Y. State Mus., 

 p. 213. 



1905. Porcellio scaber, Richardson, Bull. U. S. Nat. Mus., 

 No. 54, p. 621. 



1905. Porcellio scaber, Paulmier, Bull. N. Y. State Mus., 

 No. 91, p. 183. 



Body oblong-oval, twice as long as broad ; dorsal surface con- 

 vex and very rough with tubercles. Head with lateral lobes large 

 and rounded ; frontal lobe less prominent and obtusely triangular. 

 Eyes large and compound, placed at the base of the lateral lobes. 



Second pair of antennae slender and scarcely one-half as 

 long as body; flagellum subequal in length to the last peduncular 

 joint and made up of two subequal joints. 



Coxal plates of thorax moderate in size, with their posterior 

 corners acutely produced. Last pair of legs differing very little 

 in the two sexes. 



Abdomen at least one-fourth as long as body ; coxal plates of 

 third to fifth segments strongly recurved. Opercular plates of 



