57 



Key to the i n d o - a ii s t r a 1 i a n s p e c i e s o f C o e 1 o ii o t u s. 



1. Operculum willi a feehle keel in its basal half; head less 



llum thrice in length of trunk .... - C. ar^'iis p. 57. 



2. Cpcrculuin without keel; head thrice or more than thrice 



in trunk C. liaspis p. 57. 



I. Coelonotus argus (Ptrs). 



Sviigiial/ius argils Peters, Bericht d. Verh. Akad. Berlin, 1852, p. 685 (ncc 



Richardson). 

 Coelonotus arguhis Peters, Monatsber. Akad. Berlin 1855, p. 465. — Reise nach 



Mossambique, Zool. IV. Flussfische, 1868, p. 106. 

 Coelonotus arguhis Dumeril, Hist. nat. Poissons, II. 1870, p. 541. 

 Coelonotus biocellatus Giinther, Cat. Brit. Mus. VIII. 1870, p. 188. 

 Coelonotus argulus Giinther, 1. c. p. 189. 

 Coelonotus argulus Bleeker, Enumeration Poiss. de Madagascar in: Recherch. 



s. 1. Faune de Madagascar, Leide 1875, p. 75. 

 Coelonotus argulus Sauvage, Poissons in : Gkandidieu, Hist. nat. de Madagascar 



XVI. 1891, p. 528. 

 Coelonotus argus Duncker, Mitt. a. d. naturh. Mus. Hamburg XXXII. 191 5, p. 56. 



D. 52—53; A. 4; P. 16— 17; C. 9; Rings 16 + 38— 39; sub- 

 dorsal rings 3 — 4 + 8 — 9. 



Body rounded, the adult female compressed. Shields trans- 

 versally striated. Cristae as in genus. Operculum with a feeble 

 keel at its basal half from which radiate feeble lines. Head 

 about 10 times in total length (with caudal), about twice and 

 two-thirds in length of trunk. Eye 6^U times in head. Snout 

 slightly shorter than postorbital part of head; it is provided 

 with 3 feeble longitudinal keels or ridges. Tail with caudal 

 somewhat less than twice the length of head and trunk. 

 Brownish; trunk laterally with a black point on the intermedial 

 shields; these shields have two black points on the subdorsal 

 part of the tail; on the postdorsal part a black point on the 

 limits of their rings on the superior cristae. Length 142 mm. 

 [Not seen by us]. 



Habitat: South Flores (according to Duncker). — Mada- 

 gascar and Comores. 



In fresh water of brooks. 



2. Coelonotus liaspis (Blkr.) [Fig. 24, p. 56]. 



Syngnathus leiaspis Bleeker, Verh. Bat. Genootsch. XXV. 1853, Bijdr. Tros- 



kieuwige Visschen, p. 20. 

 Syngnathus budi Bleeker, Act. Soc. Sc. Indo-Neerl. I. 1856, Vischsoorten Manado 



en Makassar, p. 77. 

 Ileinithylaciis leiaspis Kaup, Cat. Lophobr. Fish, 1856, p. 61. 



