H'lITIIVOLOGY. 201 



Fins yi'llow. A nurrow black submarp;inal bund, oxtcriorly wliito-eilged, along tlio 

 iin.-il iind soft dorsal. A vcUow band, black bordcu'd ixtuiually down the caudal. 

 A short black band at the base of the first five anal ray.s. 



Presumably comuiou on the coast it' it possesses a vernacular name. 



CnELMo, Cuvicr. 



Snout produced as a long round tube by the horizontal elongation of the premaxil- 

 laries and mandilde, whicli are laterally connected by a web, the gape of the mouth 

 anteriorly being small. Day includes two species of this genus as inliabiting the seas 

 of India (f. hniriirodris and C. rostra' us), and adds. " Due to this tubular elongation of 

 the snout, these fishes are able to employ it as a blow-pipe, from wbieli they discharge 

 globules of water at insects flying above them." I know not if these arc the only 

 fishes which ejaculate a drop of water at passing insects, but some fish is comnmn 

 in the tidal rivers of Burma wliich captures insects on the sides of boats by bombard- 

 ing them in this fashion, as I have repeatedly witnessed. These fishes have all the 

 aspect of a CluvtoiJun. 



Hkxiochus, Ctivier et Valcncicniieif. 



Bnincliiostegals 5. Body elevated and strongly compressed. Teeth villiform. 

 A single dorsal fin. The fourth dorsal spine is elongated and filiform. Air-vessel 

 jiresent. 



H. MACRoi.EPiDOTrs, Artcdi. 



Pah-uo-dah. Andamans. 



B. V. ; D. l\-hi ; P. 17 ; V. i ; A. y^^r- ; C. 17. 



The filamentous prolongation of the fourth dorsal s]iine reaches to tlie tail or 

 beyond. Colour pearly-white, with a. dark purplish band over the snout ; auotlier 

 over tlie eyes. A tliird br(.iad one extends from the first three dorsal spines, and 

 posterior two-thirds of the opercle downwards, and includes the whole of the \entral 

 fin, and extends back to the anal. The last band commences at the summit of tlie 

 ffih dorsal spine, pisses down to the base of the seventh, and ends in the posterior 

 third of tlie anal. Pectoral, soft dorsal, and caudal fins bright yellow. 



The Andamans. 



The colour of the ground and the bands of tliis species is occasionally seen 

 transposed. In the Plate xxviii. f. 3 (Pishes of India) the last band is shown to 

 commence from the sixth dorsal spine, not the Jifth, as stated in the text. 



HoLAC-LNIHUS, LuCLpellc. 



Branchiostegals 6. Body compressed and nsually much elevated. A single 

 dorsal fin. Air-vessel witli two horns posteriorly. 



a. Scales small. 



H. NicoB.ARiENsrs, Bl. Schn. 



B. vi. ; D. ^Vf^^; P. 19; V. i; A. .nj^Vr ; C. 18. 



Colour variable. In the young it is deep blue, with sliglitly curved vertical 

 bands, alternately white and bluish-white, the former broader. Caudal white, with 

 or without a black outer margin. In some specimens there are reticulated blue lines 

 between the broad white postocular band and one descending from the centre of the 

 spinous dorsal. In the adult the vertical bands are more curved with the convexity 

 forwards. In some (the type) a white spot forms the centre round which the body 

 bands curve. 



The Nicobars. Seas of India, etc. 



H. ANNTJLAHis, Gmel. 

 Nga-lyk-pya, Arakan. 



B. vi.; D. W^^; P. 20; V. i; A. xirVr ; C. 17. 



Colour sienna, with a blue ring on the shoulder. Six or seven arched blue bands 

 radiate from tlie head and converge towards the tail. A narrow blue iuterorbital 



