198 Journal of the Asiutic Society of Bengal. [May, 1906. 
Hairs, 
The adults feed on the floating leaves of Limnanthemum, 
They also eat the stems of the same plant, crawling down them into 
the water. Their bodies are lighter than water and consequently rise 
to the surface if dislodged. Their powers of swimming are feeble and 
their movements on the surface are directed solely to securing hold of 
the nearest leaf or other floating object Under water each antenna 
the edges of which fit very closely to the lateral margins of the 
themum leaf, with the tip of th« abdomen out of the water. 
Doubtless it is taking in fresh air into this space ; but the spiracles _ 
are not in any way modified to assist in the operation. bbies » 
of air are not set free under water. 
of air, its tissues, like those of the stems of many water-plants, con- 
taining closed spaces which render it buoyant. What has occu 
' Nat. Hist, Aquatic Insects, p. 34. 2 id., op. cit. p. 95. | 
