﻿220 



Key to the indo-australian species of Tylognathiis. 



I. Two barbels only. 



1. Least height of caudal peduncle surrounded by 



12 scales T. hispiJtis p. 220. 



2. Least height of caudal peduncle surrounded by 

 16 scales. 



a. Pectorals equal to or longer than head, hnea 



lateralis 34 — 35 T. l>o Y'- 221. 



b. Pectorals shorter than head, linea lateralis 



37 — 38 T. kajanensis p. 221. 



IL Four barbels. 



1. 4I/2 scales above lateral line T. lehat p. 222. 



2. 5V2 scales above lateral line. 



a. Length of head less than height of body. . . T. falcifer p. 222. 



b. Length of head equal to height of body . . . T. schwanefeldi p. 223. 

 Doubtful species T. hasselti p. 224. 



I. Tylognathus hispidus (C. V.). 



Lahco hispidus Cuvier & Valenciennes, Hist. Nat. Poissons XVI. 1842, p. 356. 

 Chondrostoma lipocheilos Cuvier & Valenciennes, Hist. Nat. Poissons XVII. 1844, 



p. 400. 

 Gobio javaiiiciis Bleeker, Nat. Tijdschr. Ned. Indie XIII. 1857, p. 358. 

 Lobocheiiiis {Gobionichthys) java7iicus Bleeker, Acta Soc. Sc. Indo-Neerl. VI. 1859, 



Enumeratio pise. p. 145. 

 Lobocheilus {Gobionichthys) lipochcilus Bleeker, Ichth. Arch. Ind. Prodr. II. Cyprini, 



i860, p. 154. — Atl. Ichth. III. 1863, p. 59. 

 Tylognathus hispidus Gunther, Cat. Brit. Mus. VII. 1868, p. 66. 

 Lobocheilos hispidus Fowler, Proc. Acad. Nat. Sc. Philadelphia (2) LVII. 1905, p. 483. 

 Tylognathus hispidus Popta, Notes Leyden Mus. XXVIl. 1906, p. 108. 



It 



D.4.8— 9; A. 3.5; P. 1. 14— 15; V. 2.8; L. 1. 35— 36;L. tr.^. 



Height 3^/4—4'^/^, 5 to more than 6 in length with caudal. 

 Head 4 — 573, niore than 5 — /'/i ^^ length with caudal. Eye 

 more than 3 to more than 4, its centre situated somewhat 

 behind the middle of the length of the head. Structure of mouth 

 and of snout as in Fig. 88, but having two maxillary barbels 

 only. Origin of dorsal in advance of that of the ventrals, op- 

 posite to the iQtli scale of the lateral line. Anterior dorsal 

 rays more or less prolonged in adult examples. Anal more or 

 less emarginate, its height less than that of dorsal. Pectorals 

 and ventrals subequal, 6 — 6'/3 in total length. Caudal deeply 

 forked. There are 3 — 4 longitudinal rows of scales between 



