1905.] ON DRAWINGS OF FISHES OF THE RIO NEGRO. 189 



Mr. C. Tate Regan, B.A., F.Z.S., exhibited an interesting series 

 of pencil-sketches of Fishes of the Rio Negro and its tributaries, 

 made by Dr. A. R. Wallace about fifty years ago. Most unfor- 

 tunately the magnificent collection of Fishes which they repre- 

 sented, containing examples of about 200 species, was lost on the 

 voyage home. Dr. Wallace had presented the drawings, accom- 

 panied by notes on the dentition, the number of fin-rays, and 

 the coloration, to the British Museum, and Mr. Regan had been 

 engaged in their determination. A complete list of those which 

 he had been able to identify follows, but in the case of the others, 

 a large jjroportion of which probably represented species as yet 

 undescribed, it had seemed best not to reproduce the drawings 

 nor to publish notes on them, but they served to illustrate the 

 incompleteness of our knowledge of the fishes of the Amazon and 

 its tributaries. For example, the Oichlid genus Crenicichla, a 

 revision of which was read before a recent meeting of this 

 Society, was represented by 10 species. Of these only 5 had been 

 determined, including C. lenticulata Heck., unrepresented in the 

 British Museum Collection, and one described from the Essequibo 

 under the name of C. wcdlacU *. The other 5 had very distinctive 

 characters, and certainly did not belong to any of the species 

 recognised in Mr. Regan's revision. It was rather curious that 

 Dr. Wallace should have collected so few Loricariidte. The 

 I'emarkable habits of the little Silurid Va^delUa cirrlwsa had 

 been the subject of a communication made to this Society by 

 Mr. Boulenger (Proc. Zool. Soc. 1897, p. 901), and it was inter- 

 esting to read Dr. Wallace's notes on this subject f : — '"The stomach 

 is generally more or less filled with blood as it [the fish] attaches 

 itself to other fish and aquatic animals and sucks them. This 

 minute fish enters the urinary passage of men and women, wounds 

 and extracts blood within, and all efforts to extract it are usually 

 unavailing. Eff'iision of blood, inflammation, and death have in 

 several instances occurred." 



The Fishes identified were : — 



Torpedinidfe : — Tmni%wa inotor^o Miill. & Henle. 



Osteoglossidee : — Osteoglossum hicirrhosum Yandelli. 



Symbranchidse : — Symhranchns inarmoratus Bl. 



Scombresocidse : — Belone tceniata Glinth. 



Characinidae : — Macrodon trahira Spix ; Eryihrinus unikeniatus 

 Spix, E. scdmoneus Gronov., E. longipiiinis Giinth. ; Pyi^rhtdina 

 filamentosa Cuv. & Val. ; Curimatus schomburgkii Giiuth., C spi- 

 lurus Giinth., C alburmts Miill. & Trosch., G. elongatus Spix ; 

 Prochilodus insignis Schomb. ; Heniiodus immaculatus Kner, II. 

 unimacidat'us Miill. & Trosch. ; Anostomus tceiiiahis Kner, A. gra- 

 cilis Kner; Leporinus fasciatits BL, Z. affinis Giinth., X. nigro- 

 tceniatus Schomb., L. striatits Kner, L.frederici BL, L. leschenaidtii 

 Cuv. & Val., L. nattereri Steind., L. Tnargm'itaceus Giinth. ; 



* Regan, supra, p. 163, pi. xiv. fig. 2. 



t See also note iji Arch, de Parasitol. vii. 1903, p. 168 (1904). 



