1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 320 



LIST OF FISHES COLLECTED BY ALPHONSE FORRER ABOUT MA- 

 ZATLAN, WITH DESCRIPTIONS OF TWO NEW SPECIES— HEROS 

 BEANI AND PCECILIA BUTLERI. 



BY DAVID STARR JORDAN. 



Iii the year 1885 a considerable collection of Mexican fishes was sent 

 to tbe IT. S. National Museum by Alphouse Forrer, a collector then sta- 

 tioned at Mazatlan. Iain indebted to tbe courtesy of Dr. G. Brown 

 Goode, Director of tbe National Museum, and to that of Dr. Tarleton 

 H. Bean for tbe opportunity to study this interesting collection. Tbe 

 marine species are from Mazatlan or tbe Tres Marias Islands; tbe fresh- 

 water forms from the Rio Presidio, near Mazatlan. Tbe following is a 

 list of tbe species : 



1. Sphyrna zygaena (L.) 37162, a foetus. Mazatlan. 



2. Galeus lunulatus (Jordan & Gilbert.) 37163. Mazatlan. 



3. Tachysurus jordani Eigenmann & Eigenmann. 39905. Rio Presidio. One 



specimen. 



This specimen belongs to tbe species which we at first wrongly called 

 assim His, later identified by me as tbe seemani of Guuther. Eigenmann* 

 has given it a new name, jordani, regarding it as distinct from Guother's 

 species. In this specimen the bead is 4 in length; the groove of tbe 

 fontanelle extends just to the base of tbe occipital keel. 



4. Tachysurus guatemalensis (Giintber.) 37144. Rio Presidio. 



A young specimen, agreeing with the account given by Jordan & 

 Gilbert, except that tbe bead is 4 in length. 



5. Tachysurus ccerulescens (Giintber.) 39906. Rio Presidio. Two young speci- 



mens. 



Space between eyes smooth and flat; fontanelle with a very slight 

 groove, which does not reach nearly to the occipital process; the process 



* In a letter to me Mr. Eigenmann thus compares tbe two species, seemani and 

 jordani. 



From specimens about tbe same size (botb $ and 9 of seemani) we made the 

 following comparison : 



T. seemani. 

 Head flat, depressed in front; snout 

 scarcely decurved; occipital keel blunt- 

 ish ; eve 7 in bead, 3f in interocular; 

 granulations about the bead coarse, con- 

 spicuous. 



T. jordani. 

 Head scarcely depressed, the snout 

 strongly decurved; occipital keel sharper 

 than in any other species; eye 5-5$ in 

 bead, 2f-3 in interocular: granulations 

 about tbe bead less distinct than in see- 

 mani; palatine patches of teeth much 

 smaller. 



