HIGHER CRUSTACEA OF NEW YORK CITY 



183 



Length 10-12 mm. Color brown, with two lateral, and usually 

 a median light stripe. Besides these, there are two rows of mark- 

 ings which are very variable, some- 

 times being- long and sinuous 

 and sometimes merely irregular 

 blotches. In some specimens all 

 traces of a regular pattern disap- 

 pear, and the body is covered with 

 a mass of irregular brown, black 

 and white spots. 



A'ery common under stones, 

 boards etc. everywhere in the city. 



Porcellio scaber Latreille 



Porcellio scaber Latreille. 

 Hist. Nat. des Cms. et des Insectes. 

 7:45. Sars. I.e. 1899. 2:176, pi. 77. Rich- 

 ardson. /. c. 1901. p. 568. 



Tubercles large and numerous, 

 color nearly uniform. 



In this species the entire body is covered with tubercles which are 

 specially large on the head. The lobes under the eyes are well 

 developed, and the front is slightly produced. The terminal joint 

 of the antenna is slightly shorter than the preceding. 



Length 12-15 mm. Color generally a uniform black or very dark 

 gray, with traces occasionally of two lateral rows or markings. 



Found under stones, logs or bark in rather dry situations. Occurs 

 all over the city but not commonly. 



Metaponorthus pruinosus (Brandt) 



Porcellio pruinosus Brandt. Bui. de la Soc. Imp. d. Naturalistes 

 de Moscou. p. 19. 



Metaponorthus pruinosus Sars. /. c. 1899. 2 : 184, pi. 8, fig.2. 

 Richardson. /. c. 1901. p. 569. 



Lateral lobes of head small, front nearly straight; body smooth 

 and flattened. 



A small species somewhat resembling in form and in the narrow 

 abdomen Philoscia vittata, from which it may be distin- 



Fig. 56 Porcellio scaber 



