3H 



Key to the i ndo-aust ralian species of 

 Ophiocephalus. 



A. On vomer and palatines a pluriserial band of 

 small teeth, without large canines. 



I. 3 3'/2 scales in L.tr. between anterior rays of 

 dorsal and lateral line. D. 44 47; A. 2831. 



a. Head 3.1. A black white-edged ocellus at 



the upper part of the base of the caudal. 0. marulioides p. 315. 



b. Head 3.5 3.8. No ocellus at base of caudal. 

 A series of irregular dark patches along 



the sides 0. melanopterus p. 315. 



II. 4 5 scales in L.tr. between anterior rays of 

 dorsal and lateral line. D. 37 43. A. 21 27. 



a. L.I. 52 57. Pectorals shorter than post- 

 orbital part of head 0. striatus p. 317. 



b. L.I. 5 5 2 - Pectorals about as long as 



postorbital part of head 0. melanosoma p. 319. 



B. On vomer and palatines one or two series of 

 teeth, which are for the greater part canines or 

 caninoid. 



I. 3 3 ! /2 scales in L.tr. between anterior rays of 



dorsal and lateral line. L.I. 41 43. D. 31 35. 



A. 21 24 0. gacfma p. 321. 



II. 4'/2 5'/2 scales in L.tr. between anterior rays 



of dorsal and lateral line. L.I. 54 65. 



D. 3643. A. 2631. 



a. 4'/j scales in L.tr. between anterior rays of 

 dorsal and lateral line. 



ot. L.I. 55 58. Two black longitudinal 



narrow bands along head and body. . O. bistriatus p. 322. 

 /3. L.I. 64. Uniform, young specimens with 



a lateral band, consisting of separate 



dark patches 0. bankanensis p! 323. 



b. 5'/ 2 scales in L.tr. between anterior rays of 

 dorsal and lateral line. 



cc. Upper profile of head straight. L. 1.57 58. 

 Sides with 4 5 black ocelli, surrounded 

 by yellowish rings O. pleurophthalmus p. 324. 



ft. Upper profile of head more or less con- 

 cave, except in young specimens. L.I. ^ 

 58 65. Spots on sides sometimes present, 

 but never forming ocelli 0. lucius p. 326. 



