THE CRUSTACEA OF NEW JERSEY. 229 



Genus PORCELLIO Latreille. 



Sozc Bugs. 



Porcellio Latreille, Hist. Nat. Crust., VII, 1804, p. 45. Type Porcellio scaher 

 Latreille, first species. 



Body oval, more or less depressed, with lateral parts lamellarly 

 expanded. Cephalon partly flanked by side-plates of first seg- 

 ment of metasome, lateral lobes well developed, frontal lobe 

 more or less projecting and distinctly defined from epistome. 

 Metasome not abruptly contracted, epimeral plates of third to 

 fifth segments prominent and recurved, and last segment conic- 

 ally produced. Eyes usually well developed, subdorsal. An- 

 tennae moderately slender, flagellum of two articulations only. 

 Oral parts normal. Legs gradually increasing in length posteri- 

 orly, last pair in male sometimes differing from that in female. 

 Opercular plates of two anterior pairs of pleopoda, and some- 

 times also of three succeeding pairs, provided with distinct air- 

 cavities. Copulative organs of male similar in structure to 

 Oniscus. Uropoda distinctly projecting, outer ramus lanceolate, 

 inner much smaller, linear, originating far in front of former. 



Key to the species. 



a. Surface of body roughly granulate or tuberculate. scaber. 



■aa. Surface of body smooth or minutely granular. Icevis. 



Porcellio scaber Latreille. 



Plate 69. 



Porcellio scaber Latreille, Hist. Nat. Crust., VII. 1804, p. 45. "Trouve plus 

 particulicreiiiott sur les murs." (France.) 



Budde-Lund, Crust. Isopod. Terr.. 1885, p. 129. New York, Niagara. 



Stabbing, Hist. Recent Crust. (Intern. Sci. Series LXXIV), 1893, p. 



427. Europe and North America. 



H. Richardson, Proc. U. S. Nat. Mus.. XXI, 1899, p. 863. World- 

 wide. 



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



H. Richardson, Proc. U. S. Nat. Mus., XXIII. 1901. p. 568. Ocean 



Grove, New Jersey. (Niagara; New York; Woodside, Md.) 



