244 REVIEW OF TETRAODONTID^. 



11. Tetraodon erethizon. 



Arothron erethizon, Jordan &, Gilbert, Proc. U. S. Nat. Mus., 1882, 631 (Panama); 

 Jordan, Proc. U. S. Nat. Mus., 1885, 393 (Panama). 



Habitat. — Pauama fauna. 



Six large specimens of this species were taken by Prof. Frank H. 

 Bradley at Pauama. These are noyv in the museum of Yale College 

 and in the U. S. National Museum. 



Several others were obtained in 1883 by Professor Gilbert. These 

 have been destroyed by fire. No young examples have been taken. 



IV.— COLOMESUS. 



Les Batrachopes (Batrachops)' Bibron, Rovue Zoologique, 1855, 279 {2)8ittacus). 

 Batrachops HoUard, Etudes sur les Gymnodontes, 1857, 321 (ijsittacua) ; fname pre- 

 occupied). 

 COLOMESUS Gill, Proc. U. S. Nat. Mus., 1884, 422 {2)sittacus). 



Type Tetrodon psittacus Bloch & Schneider. 



Our knowledge of this genus rests wholly on the figure of its typical 

 species given by HoUard. If this figure be correct, it represents a 

 strongly marked type, considered by Professor Gill as forming a dis- 

 tinct subfamily {CoJomesinoe). The single known species inhabits fresh 

 waters. 



ANALYSIS OF SPECIES OF COLOMESUS. 



a. (Body covered with small, two-rooted spines, except ou snout, around the pectoral 

 fin and on caudal peduncle ; souie spir.es behind dorsal in very old examples. 

 Spines ou sides, with their points turned toward the back. Snout very obtuse, 

 its length less than the widtli of the interorbital space, which is convex. Eye 

 small, not one-third interorbital width. Brownish, with 6 dark cross-bands on 

 the back, the two bands between dorsal and pectoral sometimes confluent.) 



Psittacus, 12. 



12. Colomesus psittacus. 



Tetrodon pstttacm Bloch & Schneider, Syst. Ichth., 1801, 505, taf. 95 ("Mala- 

 bar"); Giinther, viii, 286, 1870. (Essequibo R., Surinam. Rio Capin, 

 Para.) 



Cheilichthiis psittacus Miiller & Troschel, " Schoniburgk's, British Guiana iii, 

 641" fSurinam); Steiudacbner. "Verb. Zool.-Bot. Ges. Wien, 1861, taf. 

 4, f. 2." 



Batrachops psittacus Hollard, Etudes sur les Gymnodontes, 1857, 322. 



Le Tetrodon per roquet Lacepede, 1, 217. (Copii d.) 



Cheilichthijs asellus Miiller & Troschell, " Sehomburgk Brit. Guiana, iii, 641." 

 1842. (Surinam.) 



Habitat. — Rivers of Guiana and Brazil. 



This species is known to lis only through the descriptions above cited. 

 Among the American species, it seems to be the only one with fluviatile 

 habit. 



V.-CANTHIGASTER. 



Caxthigaster Swainson, Nat. Hist. Class'n Fishes, ii, 1839, 194 (diagnosis only; no 



species mentioned). 

 Psilonotus Swainson, Nat. Hist.. Class'n Fishes, ii, 1839, 328 (rostratus : electrictia) 



( 1 1 r o oc c u p i e d in Hij men op ' rra ) . 



