THE CRUSTACEA OF NEW JERSEY. 231 



fomi, and marginal border formed by lateral portions of seg- 

 ments being light yellow. Length 10 mm. 



Remarks. — World-wide in distribution, living under boards, 

 logs, bricks, stones, leaves, stumps, drift along the shore, and in 

 greenhouses and cellars. When disturbed, as by lifting- up ob- 

 jects under which it may be hidden, it runs away with consid- 

 erable speed, seeking dark crevices. My examples from Point 

 Pleasant, Spray Beach, Swift City on Long Beach, Ventnor, 

 Crooked Creek. Highland Beach, Dias Creek, South Dennis and 

 Trenton. In Pennsylvania I have it from Bethlehem, Falsing- 

 ton, Holmesburg, Gladwynne and Paper Mills. In Maryland it 

 was common at Elkton, Northeast, Cedar Island in the Chop- 

 tank River, Baltimore, and along the Big Bohemia Creek. Very 

 abundant at Chincoteague, Virginia. Mr. W. T. Davis found it 

 on Staten Island. New York. 



Porcellio laevis Latreille. 

 Plate 70. 



Porcellio lavis Latreille, Hist. Nat. Crust., VII, 1804, p. 46. "Sous les 

 pierres." (France.) 



De Kay, N. Y. Fauna, Crust., VI, 1844, p. 52. New York. 



• Stebbing, Hist. Recent Crust. (Intern. Sci. Ser. LXXIV), 1893, p. 



427. World-wide. 



. H. Richardson, Proc. U. S. Nat. Mus., XXI, 1899, p. 862. World- 

 wide. 



H. Richardson, Am. Nat., XXXIV, 1900, p. 304. North America. 



■ H. Richardson, Proc. U. S. Nat. Mus., XXI, 1901, p. 566. World- 

 wide. 



H. Richardson, Bull. U. S. Nat. Mus., No. 54, 1905. p. 614, fig 666. 



World-wide. (Washington, D. C.) 



Description. — Body with length nearly twice its width, oblong, 

 ovate. Head broader than long, front edge trilobate, median 

 lobe triangulate and larger lateral lobes rounded. Eyes com- 

 posite, small, placed at bases of anterior lateral expansions. First 

 pair of antennae small, obsolete, formed of two segments. Sec- 

 ond antenn;e with first segment short, second segment one and 

 one-half longer than first, third segment long as second, fourth 

 segment almost twice length of third, and fifth segment one 



