666 RfTLLETIN r)4. TT:r^TTED STATES KATTONAL MnSEUM. 



edge. C'lypeus very short, with the {interior margin slightly sinuated 

 in the middle, not lohate. 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 antennte scarcely equal to half the length of the body; tiagel- 

 lum composed of two articles. 



First segment of thorax with epimera not cleft posteriorly. 



Terminal segment of abdomen quadrangular or triangular in shape, 

 not extending beyond the epimera of the preceding segment. 



Opercular plates of the tirst two pairs of pleopoda furnished with 

 trachea'. 



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

 lamellar, flattened; inner ))ranch narrow, cylindrical. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS ARMADILLIDIUM. 



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

 epistonie. Outer branch of the uropoda posteriorly truncate. 



AriuadiUidium vulgare (Latreille) 



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



epistf)me, which extends some distance in front. Outer branch of the uropoda 



posteri( )rl v rounded ArtiKuliUUVnim qiKtdrifronx Stoller 



ARMADILLIDIUM VULGARE (Latreille). 



Armadillo rid(/<trf Latreille, Hist. Crust., \'ll, 1S()4, p. 4S; Gen. Crust., I, 1806, 

 p. 71. 



AniuidHlo j>lhdarl.^F,\\, Jour. Ac. Nat. Sci. Phila., I, 1818, pp. 482, 433. 



AniindilUdiiim rommntuttun Brandt and Ratzekurc;, Med. Zool., II, 1830-1834, 

 p. SI, pi. xiii, li>rs. 1, 2, 3, A, B. 



AniKidilld triridlls Kocn, Deutschl. Crust., 1S.35-1S44, p. 28. 



AniKidilln piliihiris (ioiLD, Uep. Invert. ]Mass., 1841, j). 33(5. — De Kay, Zool. New 

 York, 1844, Ft. (i. Crust., p. 52. 



Aniiailillo (iter ^vusvr/AAUi, De Oniscincis a.uri Bonncnsis, 1853, p. 26. 



AriiiadiUidluiii nil(/<tre BrnnE-LcNi), Crust. Isoi>. Terrestria, 1885, jip. 66-68 (see 

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

 pi. LxxxiL— 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. 



Localti'iex. — Anderson's ferry, Cinchinati, Ohio; Norwood, Ohio; 

 Clifton, C'incimiati. Ohio; Columbus, Ohio; Coney Island, Ohio; Mount 

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

 ton, Kentucky; Aiken, South C-arolina; Harrington Sound, Ber- 

 nmdas; Hamilton, Hernmdas; Washington, District of Columbia; Syra- 

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

 Charlestown, South Carolina; Providc^nce, Rhode Island; Canton, 

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

 side, Maryland: Fayal, Azores; ()rl(>ans villa, AlgiM-ia; world-wide in 

 distribution. 



