380 



CRUSTACEA 



P. scaber Lat. (Fig. 608). Body covered with minute tubercles, 12 

 mm. long, 7 mm. wide, of unif orm black color, without spots or blotches : 

 entire America; cosmopolitan; under bark, logs, etc. 



P. laevis Lat. Body smooth or minutely granulate, 15 mm. long, 8 

 mm. wide, dark gray in color with 2 wavy median lighter bands: entire 

 America; cosmopolitan. 



5. METOPONORTHUS Budde-Lund. Body oval, flattened, without lat- 

 eral lobes; second antennae long, ending in 2 short segments; abdomen 

 abruptly narrower than thorax; uropods long: 4 American species. 



M. pruinosus (Brandt) (Fig. 609). Length 9 mm.; width 4 mm.; 

 color reddish-brown in the hinder and lateral portions, and lighter in 

 the other portions: entire America; cosmopolitan; under logs, etc. 



FAMILY 12. ARMADILLIDIDAE. 



Body convex and able to be rolled into a ball; first antennae minute; 

 second antennae short; uropods short and not extending beyond the 



terminal segment: terrestrial; 6 genera 

 and 23 American species. 



ARMADILLIDIUM Brandt. Pill bugs. 

 With the characters of the family; exopo- 

 dite of uropod large and lamellar; ter- 

 minal segment triangular: 2 species. 



A. vulgare (Latreille) (Fig. 610). 

 Length 16 mm.; width 8 mm.; color black 

 or dark gray with rows of indistinct spots: entire America; cosmo- 

 politan: under stones, etc., in damp places. 



Fig. 610 Armadittidium vulgare 

 (Paulmeier). 



FAMILY 13. LIGYDIDAE. 



Body elliptical or elongate; first antennae minute; second antennae 

 long, with numerous small terminal segments; buccal 

 mass prominent; uropods long: marine; 2 genera and 

 12 American species. 



LIGYDA Rafinesque. The two branches of the 

 uropods of about equal length and stylifonn: 6 

 American species. 



L. exotica (Roux) (Fig. 611). Body elongate, 48 

 mm. long (with uropods), 14 mm. wide: Florida to 

 North Carolina; California; cosmopolitan; among 

 rocks and on piles and docks; common. 



L. oceanica (L.). Body oval, 22 mm. long (with uropods), 8 mm. 

 wide, and with a granulate surface: New England; Europe. 



Fig. 611 

 Ligyda exotica 

 (Richardson). 



