DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 403 
Xiphophorus with one, Mollienesia with one, Pecilia with eight, and Belonesox with 
one species. 
The affinity of this freshwater fauna with that of Mexico, will be found to be greater 
than with that of any other country (I might mention about ten species common to 
Guatemala and Mexico); but until we are better acquainted with the habitats of species 
described as Mexican, a more detailed comparison of the two countries would be of but 
little advantage. The freshwater fish-fauna of Central America may be shortly thus 
characterized :—A part of the Chromides (Heros, &c.) and the Cyprinodontes generally 
have attained to their greatest development ; neotropical types eatending northwards 
prevail over nearctic extending southwards, the latter being represented by a few extreme 
branches. 
§ 8. An Attempt to Subdivide this Fauna into Provinces. 
We may subdivide this part of the freshwater fauna into the following provinces :— 
A. The fresh waters north of the Lakes of Manaqua and Nigaragqua, emptying into the 
Pacific.—To this province belong the fishes collected at Chiapam [Ch.], Huamuchal [H. ]}, 
San José [J.], in the Rio Guacalate (Duefias) [G.], San Salvador [S.]}, and Libertad [L.]; 
also the fishes from the Lakes of Amatitlan [Am.] and Atitlan [At.] may be referred to 
the same province, 
[The species printed in italics in the following lists are found also in one or more 
other provinces, and in Atlantic rivers. | 
Heros macracanthus . ... . . Ch. H. — = a == — 
friomacniatus <a>, .,.-_....Ch. H. — — = — = 
BIOTOMNGIAIS: 68 ey Oe yy ak — — _ — Am. At. 
TATRA S TTT a oA re WS Tos ec = = 
Agonostoma microps . . . .- ..—= — _ G. — — — 
Arius guatemalensis. . . . . . . Ch. — — — 
——wiplAbyPOROM gs gales e+ e062 0s — — J 
CAIUIENGENS: eget wy eee 7s ey Se H. — — 
Pimelodus guatemalensis . . . . . — Be _- — — = — 
Anacyrtus guatemalensis . . . . . — H. —_ —_— — = = 
Tetragonopt. microphthalmus. . . . — — — _ — An, — 
Prretliteeembsres 22 hela cele Tey beri — _ — — An — 
Fundulus guatemalensis . . . . « — — — G: — An, — 
PECL GVMIT om o goa pli = == — — — — — At. 
PUNCLALIs Meee ese | Ch — — = — = 
Anablepsidoviieee ke eee (Ch — — = 
Pecilia mexicana. . . . . 5 . . Ch. H. —- G. — An. — 
LRerMalisie HIS RORO  . =S — — -- 
HOVER ou, oN Uy oe SS Se Sean 
Girardinus pleurospilus. . . . . . — — = G. = 2s —_ 
Clupeatiiibertatises 8, es — o- -- L. — — 
Lepidosteus tropicus. . . »+ .- 2. . — H. — — —_— — — 
