666 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



edge. Clypeus very short, with the anterior margin slightly sinuated 

 in the middle, not lobate. Frontal marginal line interrupted in the 

 middle. Vertical marginal line wanting behind the eyes on both sides. 

 Eyes small or moderately large, distinct, lateral, composite. Second 

 pair of antennas scarcely equal to half the length of the bod}'; tiagel- 

 lum composed of two articles. 



First segment of thorax with epimera not cleft posteriori}'. 



Terminal segment of abdomen quadrangular or triangular in shape, 

 not extending beyond the epimera of the preceding segment. 



Opercular plates of the first two pairs of pleopoda furnished with 

 tracheae. 



Uropoda short; basal article broad, obliquely quadrate; outer branch 

 lamellar, flattened; inner branch narrow, cylindrical. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS ARMADILLIDIUM. 



. Head truncate in front, without median emargination, and not surpassed by the 

 epietome. Outer branch of the uropoda posteriorly truncate. 



Armadillidium vulgare (Latreille) 



a 7 . Head with a small median V-shaped' notch in front, and surpassed by the 

 epistome, which extends some distance in front. Outer branch of the uropoda 

 posteriorly rounded Armadillidium quadrifrons Stoller 



ARMADILLIDIUM VULGARE (Latreille). 



Armadillo vulgare LATREILLE, Hist. Crust., VII, 1804, p. 48; Gen. Crust., I, 1806, 

 p. 71. 



Armadillo pilularis SAY, Jour. Ac. Nat. Sci. Phila., I, 1818, pp. 432, 433. 



Armadillidinm commutatum BRANDT and RATZEBURCJ, Med. Zool., II, 1830-1834, 

 p. 81, pi. xin, tigs. 1, 2, 3, A, B. 



Armadillo trivialift KOCH, Deutschl. Crust., 1835-1844, p. 28. 



Armadillo pilularix GOI T LD, Rep. Invert. Mass., 1841, p. 336. PE KAY, Zool. New 

 York, 1844, Pt. 6, Crust, p. 52. 



Armadillo ater SCHNIT/LER, Pe Oniscineis agri Bonnensis, 1853, p. 26. 



Armadillidium ndgare BrnnE-Lrxn, Crust. Isop. Terrestria, 1885, pp. 66-68 (see 

 Budde-Lund, for synonymy). SARS, Crust. Norway, II, 1899, pp. 189-190, 

 pi. LXXXII. RICHARDSON, Amer. Nat., XXXIV, 1900, p. 305; Proc. U. S. 

 Nat. Mus., XXIII, 1901, p. 574. CHILTON, Trans. Linn. Soc. Lond., (2), 

 VIII, Pt. 4, pp. 142-143. STOLLER, 54th Report New York State Museum, 

 1902, p. 210. PAULMIER, Bull. New York State Museum, 1905, pp. 184-185. 



Localities. Anderson's ferry, Cincinnati, Ohio; Norwood, Ohio; 

 Clifton, Cincinnati, Ohio; Columbus, Ohio; Coney Island, Ohio; Mount 

 Auburn, Cincinnati, Ohio; Redbank, Hamilton County, Ohio; Lexing- 

 ton, Kentucky; Aiken, South Carolina; Harrington Sound, Ber- 

 mudas; Hamilton, Bermudas; Washington, District of Columbia; Syra- 

 cuse, New York; Bay Shore, Long Island; Salem, Massachusetts; 

 Charlestown, South Carolina; Providence, Rhode Island; Canton, 

 Mississippi; New Orleans, Louisiana; Lexington, Kentucky; Wood- 

 side, Maryland; Fayal, Azores; Orleans villa, Algeria; world-wide in 

 distribution. 



