880 PROCEEDINGS OF THE NATIONAL MUSEUM. vouxxii. 



fDIPLODON RUFOFUSCUS Lea. 



* Unio rufojuscus Lea, Pr. Ac. N. Sci. Phila., IX, 1865, p. 76; *J1. Ac. N. Sci. Phila., 



VI, 1868, p. 282, pi. XXXIX, fig. 96; *Obs., XII, 1869, p. 42, pi. xxxix, fig. 96. 

 *Maragon ( Unio) riifofuscus Lea, Syn., 1870, p. 31. 



South America. 



DIPLODON DEMARARAENSIS Lea. 



*Unio demararaensis Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 152; *J1. Ac. N. Sci. 

 Phila., IV, 1860, p. 253, pi. xxxix, fig. 133; *Obs., VII, 1860, p. 71, pi. xxxix, 

 fig. 133.— *Reeve, Conch. Icon., XVI, 1865, pi. xxii, fig. 99. 



* Maragron ( Z7?wo) demararaensis Lea, Syn., 1870, p. 36. 



* Unio demararaensis P^tel, Conch. Sam., Ill, 1890, p. 150. 



Demerara. 



t DIPLODON LEPIDIOR Lea. 



* Unio lepidus Lea.' Pr. Ac. N. Sci. Phila., IV, 1860, p. 91; * Jl. Ac. N. Sci. Phila., 



V, 1863, p. 390, pL l, fig. 306; ^Obs., X, 1863, p. 25, pi. l, fig. 306. 



* Margaron ( Unio) lepidior Lea, Syn., 1870, p. 53. 



Uruguay iiiver. 



t DIPLODON PAROUS Lea. 



"* ZJmojjarcMS Lea, Pr. Ac. N. Sci. Phila., X, 1866, p. 34; * Jl. Ac. N. Sci. Phila., VI, 



1868, p. 262, pi. xxxiii, fig. 77 ; * Obs., XII, 1869, p. 22, pi. xxxiii, fig. 77. 

 ' Margaron ( Unio) parous Lea, Syn., 1870, p. 47. 



South America. 



+ DIPLODON CHILENSIS Gray. 



* Unio chilensis Gray, Spic. Zool., 1828, pi. vi, fig. 12. — "Philippi, Conch., Ill, 1847, 



p. 9, pi. IV, fig. 2.—* Hupe, Gay's Hist. Chile, VIII, 1854, p. 317.—* H. and A. 

 Adams, Gen. Rec. Moll., II, 1857, p. 497.—* Kuster, Conch. Cab. Unio, 1862, 

 p. 282,pl. xev, fig. 12.— ■ Sowerby, Couch. Icon., XVI, 1867, pi. lvi, fig. 286.— 

 *PiETEL, Conch. Sam., Ill, 1890, p. 148. 



* Unio smithii Gray and Pidgeon, Grifi\ Cuv., XII, 1834, p. 600, pi. xx, fig. 3.^ — 



* Hanley, Biv. Shells, 1843, p. 195, pi. xxiii, fig, 58. — * H. and A. Adams, Gen. 

 Rec. Moll., II, 1857, p. 495.—* P^etel, Conch. Sam., Ill, 1890, p. 167. 



* Margariia ( Unio) smithii Lea, Syn., 1836, p. 27; 1838, p. 20. 



* Margaron ( Unio) smithii Lea, Syn., 1852, p, 30; 1870, p. 48. 



* Unio auratus Philippi, Conch., Ill, 1847, p. 9, pl.iv, fig. 1.' — *H. and A. Adams, 



Gen. Rec. Moll., II, 1857, p. 492.— * P^etel, Conch. Sam., Ill, 1890, p. 145. 

 ^Margarita ( Unio) auratus Lea, Syn., 1836, p. 31; 1838, p. 22. 



* Margaron ( Unio) auratus Lea, Syn., 1852, p. 33; 1870, p. .53. 



* Unio araucanus Philippi, Conch., Ill, 1847, p. 50, pi. iv, fig. 3. — * Kuster, Conch. 



Cab. Unio, 1862, p. 283, pi. xcv, fig, 3. 

 ^'Margaron ( U7iio) araucanus Lea, Syn., 1870, p, 53, 

 ''' Unio araucana Hupe, Gay's Hist. Chile, 1854, p. 317, 



Chile. 



"' Changed to lepidior because the name lepidus had been used for a Unio by Gould, 

 ■2 Only the briefest description is giveu of this in the index. From the figure it 



seems to be identical with chilensis. 

 ^ Generally credited to Swainson, and Philippi refers it to him with doubt. But I 



can not find that Swaiuson ever published it. 



