Fig. 19 
CENTER 
4 = 
Nine BEB AEE 
mene dean 
Y | 
Ra a 
5 
a am 
om 
4 
ol] yet 
| 
deoocoEa C] HH 
HEE COO SOpengES EE PES as 
= We 2166 500 U/I18 MREAKE 
Mean MonTHiy CatcH oF LARGE AND SMALL Waitcuus in Cwrs. per 100 Hours’ Trawiine in Anga XVIII. (SmoorHep) 
(Black line, Large Whitches ; broken line, Small Whitches.) 
