?f 1896.] A. Alcock— Warning Colours. 539 



The antennules are well developed, and the eyes are large globular 

 and stalked. 



The " rostrum" is a small fleshy foliaceous excrescence, situated in 

 front of the mouth, and furnished with a short median finger-like 

 papilla : its free edge is thus somewhat trilobed. 



The antennae in the male are more than half as long as the body. 



Their basal joint has on the ventral surface, at the distal end, a 

 curved rather rigid antenniform filament. 



The doubly-curved second joint has (1 ) at its proximal end, dor- 

 sally, four curved flagella, one of which is much larger than the others 

 and has its concave edge serrated ; and (2) along its outer and upper 

 surface a row of long acicnlar spinelets. 



The third segment, which joins the second almost at a right angle, 

 bifurcates from its base into (1) a short upstanding (dorsad) branch, 

 and (2) an obliquely-directed (ventrad) branch. The outstanding 

 dorsad branch itself soon bifurcates into (1) a stout downcurved hooklet; 

 and (2) a slender slightly curved flagellum. The long ventrad branch 

 consists of (I) a slender basal piece ; and (2) two long slender flagella : 

 the outer flagellum is elegantly curved and hook-like ; the inner flagel- 

 lum, which has its dorsal edge armed with a row of short spinelets, 

 again bifurcates — the outer (longer) branch of this last bifurcation being 

 also curved and hook-like. 



The antennse in the female form a pair of short broad leaf-like 

 lobes — usually with a thickened fleshy midrib — bending over the eyes 

 in repose, like curtains. 



In the above description the antennae of the male are supposed to 

 be fairly well extended, not flexed in repose ; and the animal is sup- 

 posed to be in morphological position, not swimming on its back as in 

 life. A male and an egg-laden female were liberated in the Museum 

 tank in the hope of establishing a supply of this large and beautiful 

 species. 



An Instance of the Natural Repellent Effect of " Warning Colotirs." — By 

 A. Alcock, m.b., C.m.z.S., Superintendent of the Indian Museum. 



[ Received 19th August, 1896.] 



The observation here recorded appears to be. noteworthy as corro- 

 borative evidence in favour of the protective value of " Warning 

 Colours." 



I have in my possession a very docile young Himalayan bear, one of 

 whose most strongly marked appetites is for grasshoppers. He eeizes 



