270 FISHES OF WESTERN SOUTH AMERICA 
This delightful miniature sailing fish, according to Stoye, was first introduced 
into aquaria by Fritz Mayer, in 1910, the source of the specimens unknown. 
———, 5, 22-30 mm., woodland brook near Iquitos, Allen, September, 1920. 
Subfamily: AGONIATINAE 
Genus 136: PARAGONIATES Steindachner 
Paragoniates Steindachner, 1876, Sitzb. Kix. Akad. Wiss. Wien, LX XIV, 117; 
Higenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 441. 
Type: Paragoniates alburnus Steindachner 
Maranon to southeastern Brazil 
Dorsal fin in a posterior position, short; body narrow, much compressed; anal 
fin very long; jaw-teeth in single series, larger incisors with 1-2 lateral cusps; gape 
long; scales large; lateral line poorly developed except on forward part of trunk. 
350. PARAGONIATES ALBURNUS Steindachner 
Paragoniates alburnus Steindachner, 1876, Sitzb. KKK. Akad. Wiss. Wien, LX-XIV, 117, pl. viii, 
fig. 3, Canelos; 
Boulenger, 1887, Proc. Zool. Soc. London, 281; 
EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 441. 
Solimoes and Maranon valley 
———, 5, 48-61 mm., Rio Morona, Allen, October, 1920. 
Determination by G. 8S. Myers; Boulenger points out the considerable width 
of the mouth, the interruption of the lateral line, and slight precedence of the anal 
with respect to the backward dorsal. 
Genus 137: LEPTAGONIATES Boulenger 
Leptagoniates Boulenger, 1887, Proc. Zool. Soc. London, 281; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 441. 
Type: Leptagoniates steindachneri Boulenger 
Range that of the one species 
Body very elongate and compressed; gape of mouth narrow; premaxillary, 
maxillary, and mandible with single series of tricuspid teeth; dorsal fin short, 
posterior to middle of body, and remotely beyond ventrals; anal very long, nearly 
two-thirds total length of the fish; lateral line complete. 
351. LEPTAGONIATES STEINDACHNERI Boulenger 
Leptagoniates steindachneri Boulenger, 1887, Proc. Zool. Soc. London, 282, pl. xxi, fig. 3; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 441. 
Sarayacu, Peru 
Known from the unique type 95 mm. in length. 
