ANNOTATED LIST OF THE SPECIES 127 
Known only from the two types, 90 and 110 mm., in the Vienna Museum; 
from Iquitos. 
Genus 37: LIOSOMADORAS Fowler 
Liosomadoras Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 226. 
Type: Liosomadoras morrowi Fowler 
Contamana, Rio Ucayali 
Near Lithodoras and Agamyzxis; robust; lacking lateral scutes on the trunk 
and tail. 
80. LiosoMADORAS MORROW! Fowler 
Liosomadoras morrowi Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., NCI, 226, figs. 11-14. 
Known from the type, 100 mm. in length, from Contamana. 
Genus 38: AMBLYDORAS Bleeker 
Doras Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 267; 
Jigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 220. 
Amblydoras Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 86, affinis; 
Eigenmann, 1925, Trans. Amer. Phil. Soc., XXII, 325. 
Zathorax Cope, 1872, Proc. Acad. Nat. Sci. Phila., 271. 
Type: Doras affinis Kner 
Amazonia to the Guianas and Bolivia 
A large breastplate representing the coalesced granulations of coracoid and 
clavicle; coracoid process shorter than humeral; dorsal spine without lateral 
spinules, grooved and ridged; lateral scutes numerous and large, totalling more 
than half the sides; adipose fin not continued as a keel; eye midway of the head; 
mouth terminal. 
81. AMBLYDORAS HANCOCKII (Cuvier and Valenciennes) 
Doras costata Hancock, 1828, Zool. Jour., [V, 242, Demarara. 
Doras hancockii Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 279; 
Gunther, 1864, Cat. Fish. Brit. Mus., V, 202; 
Eigenmann and Higenmann, 1890, Oec. Papers Cal. Acad. Sci., I, 234; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 393; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 187. 
Amblydoras hancocki Eigenmann, 1925, Trans. Amer. Phil. Soc., XXII, 326, pl. 1, fig. 9; pl. xiii, 
figs. 1-4. 
Amblydoras hancockii Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., 228. 
Doras affinis Kner, 1855, Sitzb. KKK. Akad. Wiss. Wien, XVII, 121, pl. xi, fig. 1; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 202; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 238. 
Doras (Amblydoras) affinis, Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 393, 
