57 

 Key to the indo-australian species of Coelonotus. 



1. Operculum with a feeble keel in its basal half 5 head less 



than thrice in length of trunk .... - C. argus p. 57. 



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



in trunk C. liaspis p. 57. 



i. Coelonotus argus (Ptrs). 



Syngnathus argus Peters, Bericht d. Verb. Akad. Berlin, 1852, p. 685 (nee 



RICHARDSON). 

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



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

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

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

 Coelonotus argulus Gunther, I.e. p. 189. 

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



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

 Coelonot^ls argulus Sauvage, Poissons in : GRANDIDIER, Hist. nat. de Madagascar 



XVI. 1891, p. 528. 

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



D. 5253; A. 4; P. 1617; C. 9;- Rings 16 + 38 39; sub- 

 dorsal rings 34 + 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 l / z 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 postdqrsal 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, Verb. 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. 

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



