EIGENMANN: CATALOGUE OF FRESH WATER FISHES. 



405 



Plecostomus punctatus Gunther ; Ple- 

 costomus officinis Steindachner ; Ple- 

 costomus commersoni, affinis and 

 scabriceps Eigenmann & Eigenmann. 

 Habitat : Southeastern Brazil. 



well developed membrane 

 either to the 3 or 4 scales 

 following it,' or to the spine 

 of the adipose fin. D. I, 7. 



10. Parancistrus Bleeker. 

 //. Sides of head with slender 



bristles. D. I, 7. Last dorsal 

 ray attached to the scute fol- 

 lowing it by an inconspicuous 

 membrane at its base. 



11. Lasiantistrus Regan. 

 kk, Interoperculum armed with slender 



spines which cannot be com- 

 pletely retracted beneath the 

 operculum, or with permanently 

 everted bristles, sides of head 

 with bristles which are always 

 longer in the male than in the 

 female, and may be wanting in 

 the latter ; last dorsal ray con- 

 nected by a membrane with one 

 or two scutes following it ; ab- 

 domen completely naked. 

 o. D. I, 7 or I, 8. 



12. Pseudancistrus Bleeker. 

 oo. D. I, 9 or I, 10. 

 13. Delturus Eigenmann & Eigenmann. 

 //. Teeth few, spoon-shaped. 



p. Interopercnlum without evertible 

 spines. 14. Cochliodon Heckel. 

 pp. Interoperculum with some slender, 

 evertible spines. 



IJ. Panaque Eigenmann. 

 li. Snout with naked margin. 



q. Mouth wide, the length of mandibular 

 ramus nearly equal to the interorbital 

 width ; naked margin of snont not 

 very wide, without tentacles. 



16. Chatostomus Tschudi. 



qq. Mouth moderate or narrow, the length 



of mandibular ramus considerably 



less than the interorbital width. 



r. Snout with a broad, naked margin, 



without tentacles. 



17. Xenocara Regan. (Type, the 



first species, X. latifrons Gunther.) 



rr. Snont with tentacles, the naked 



margin broad in males, narrow 



in females. 18. Ancistrus Kner. 



bb. Premaxillaries much shorter than the dentaries 



and with fewer teeth. 

 s. Premaxillaries united ; body not greatly de- 



4. Plecostomus spinosissimus Steindach- 

 ner, Regan, 208. 



Habitat : Guayaquil, Pacific slope of 

 Ecuador. 



pressed. 19. Pseudacanthicus Bleeker. 



ss. Premaxillaries not united; body much 



depressed. 20. Lithoxus Eigenmann. 



aa. First two scutes of the lower lateral series below 



the temporal plate and in contact with it above. 



21. Acanthicus Spix. 



HYPOPTOPOMIN.*. 



a. Temporal plates imperforate. 



b. An adipose dorsal fin. 22. Hypoptopoma Gunther. 

 bb. No adipose fin. 



23. Oxyropsis Eigenmann & Eigenmann. 

 aa. Temporal plates perforated like a sieve. 



c. Abdomen covered with three longitudinal series of 



plates. 



d. An adipose dorsal fin. 



24. Parotocinclus Eigenmann & Eigenmann. 



dd. No. adipose dorsal fin. 25. Otocinclus Cope. 



cc. Abdomen naked or covered with numerous small 



plates, irregularly arranged. 

 26. Microlepidogaster Eigenmann & Eigenmann. 



Lonouoout. 



a. Teeth in the jaws in small or moderate number, not 



setiform; a more or less distinct orbital notch. 

 b. Snout rounded or pointed, not, or not much pro- 

 duced. 27. Loricaria Linnaeus. 

 bb. Snout produced, with a long rostrum. 

 c. Snout expanded at tip. 



28. Hemiodontichthys Bleeker. 

 cc. Snout pointed, not expanded at tip. 



29. Reganella Eigenmann. 



aa. Teeth in the jaws numerous, setiform ; orbit cir- 

 cular, without distinct notch. 



d. Dorsal opposite to the ventrals. 



e. Snont rounded or pointed, not produced as a 



rostrum; lateral keels obsolete. 



30. Harttia Steindachner. 



ee. Snont produced, forming a distinct rostrum ; 



sides of the head in the male margined 



with bristles. 31. Sturisoma Swainson. 



dd. Dorsal opposite to the anal ; snout very long, 



body very slender. 



32. Farlowella Eigenmann & Eigenmann. 



NEOPLECOSTOMINvE. 



a. Elongate; upper part of body enclosed in bony 

 scutes ; eyes small, teeth bifid, in a single series ; 

 an adipose fin. 



33- Neoplecostomus Eigenmann & Eigenmann. 



