SQUAMIPINNES. 



399 



m the East Indian Archipelago as in Polynesia, like many 

 others of its congeners. 



Chelmo differs from Clmtodon only in haviag the snout 

 produced into a more or less long tube. 



Only four species are known, locally distributed in the 

 tropical seas. Ch. rostratus, the oldest species known, is 



Fig. 168. — Chelmo margiualis, from the coast of Australia. 



said to have the instinct of throwing a drop of water from 

 its bni so as to light upon any insect resting on a leaf, 

 and thus make it faU, that it may instantly dart upon it. 

 This statement is erroneous, and probably rests upon the 

 mistaken notion that the long biU is especially adapted for 

 this manceuvre, which, indeed, is practised by another fish 

 of this family {Toxotes). The long slender bill of Chelmo 

 (which is a true saltwater fish) rather enables it to draw from 

 holes and crevices animals which otherwise could not be 

 reached by it. 



Heniochus. — One dorsal, with from eleven to thirteen spines, 

 the fourth of which is more or less elongate and filiform. Snout 



