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WATERCRESSES. 
Caddis Worms, larve of Caddis Flies or Water Moths. 
(Trichoptera.*) 
MorMONIA NIGROMACULATA.—Water Moth, magnified, and lines showing natural size 
(after Westwood); Caddis Worm “ cases” of Limnephilus flavicornis, magnified. 
One of the first observations sent me in 1896 was a report for- 
warded on January 22nd regarding serious loss which was being 
caused to a market gardener by attack of ‘‘Caddis Worms”’ to his 
Watercresses. 
These larve, which, with hardly any exceptions, are aquatic, live 
in cases, whence they take their name of Case or Caddis Worms. 
Three different forms of these, belonging to the larva which presently 
turns to the very common Caddis Fly, or Water Moth, Limnephilus 
flavicornis, Fab., are figured a good deal magnified; the expanse of the 
fore wings of L. flavicornis is from one inch to an inch and a quarter. | 
* This order is limited to about one hundred and twenty-seven species very 
similar in their habits as aquatic larve, but of which many are undescribed, there- 
fore I have only given above the popular and scientific name of the order. 
+ These figures I beg to acknowledge with thanks as copied from plate ii. of 
‘ Trichoptera Britannica: a Monograph of the British Species of Caddis Flies,’ by 
Robert McLachlan (Trans. Ent. Soc., 3rd Series, vol. v.), of which sometimes 
separate impressions are still occasionally obtainable. In this valuable work, the 
reader will find full descriptions of the Caddis Flies, and also useful information 
regarding such of the larvae as were available for examination,—the formation of 
their cases, and the nature of the localities frequented. 
