CHAP. XX.] FISHES. 443 



(1 sp.), northern and southern tributaries of Amazon ; Piratinga 

 (3 sp.), Amazon Valley ; Seiades (2 sp.), Amazon ; *Pwielodus 

 (42 sp.), Mexico to La Plata, single aberrant species from West 

 Africa, Java and the Sandwich Islands ; Pirinampus (1 sp.), 

 Brazil ; Conorhynchus (1 sp.), Brazil ; Notoglanis (1 sp.), Madeira, 

 Amazon Valley ; Callophysus (3 sp.). Tropical South America ; 

 Auchenaspis (1 sp.), Tropical Africa ; Arius (68 sp.), all Tropical 

 regions ; Galcichthys (1 sp.), Cape of Good Hope ; Genidens (1 

 sp.), Brazil; Remipimelodus (3 sp.), India, Sumatra, and Borneo; 

 Ketingus (1 sp.), Sunda Islands; ^lurichthys (4 sp.), Eastern 

 United States to Guiana ; Paradiplomystax (1 sp.), Brazil ; Di- 

 plomystax (1 sp.), Chili ; Osteogeniosus (3 sp.), India to Java ; 

 Batrachocephalus (1 sp.), Java and Sumatra ; Bagarius (1 sp.), 

 India to Java ; Eiidyptosternum (1 sp.), India ; GiyptosternuW' 

 (8 sp.), Himalayas, Central India, Java, and Sumatra ; Rara (3 

 sp.), Continental India; Amblyceps (3 sp.). Continental India. 



Sub-family 5 (Silukid^ Stenobranchi^) is confined to South 

 America and Africa, with one genus and species in the Ganges. 

 It consists of three groups : Doradina (12 genera). South America 

 and Africa; Rhinoglanina (3 genera). Central Africa and the 

 Ganges ; Malapterurina (1 genus), Tropical Africa. The distri- 

 bution of the genera is as follows : — 



Ageniosus (4 sp.), Surinam to La Plata ; Tetranematichthys (1 

 sp.). Central Brazil, Rio Guapore ; Euanemus (1 sp.), Surinam 

 and Brazil ; Auchcnipterus (9 sp.), Equatorial America ; Centro- 

 mochlus (2 sp.), Equatorial America; Trachelyopterus (2 sp.), 

 Equatorial America; Cdopsis (3 sp.), Brazil; Asterophysus (1 

 sp.), Rio Negro, North Brazil; Doras (13 sp.). Tropical South 

 America east of Andes ; Oxydoras (7 sp.), Amazon Valley and 

 Guiana; RUnodoras (3 sp.), Tropical South America east of 

 Andes ; Synodontis (12 sp.), Tropical Africa ; Rhinoglanis (1 sp.). 

 Upper Nile; Mochocus (1 sp.), Nile; Callomystax (1 sp.), Nile; 

 Malapterunts (3 sp.). Tropical Africa. 



Sub-family 6 (Silurid^ Proteropodes) inhabits Tropical 

 America and Northern India as far as Tenasserim. It consists 

 of two groups: the Hypostomatina (17 genera), with the same 

 distribution as the sub-family, and the Aspredinina (3 genera), 



