256 
FHRYGANEA. 
the former, and is of a yellowish brown colour, 
with two obliquely transverse rhomboid semi- 
transparent white spots on each upper wing 5 the 
lower wings being whitish with a tinge of yellow- 
brown towards the upper edge. The larva forms 
its case of small pieces of the .slender stems of 
water grasses or other plants curiously disposed 
in an obliquely transverse direction. It is of a 
greenish brown colour, and like the former, is 
found in rivulets and stagnant waters. The Larvae 
of the Phryganeae in general feed not only on the 
smaller water insects but on the spawn of fishes, 
and even on the young fry itself. 
