CONTENTS. 
SrasualMNstOry’. <2. cer seeetema eases eas Sav ays Fob sk nee beet vesk Bee 
RULED E DEOOG, Ob, Wie sacere se ers es 88 Me oo eo eee es 8 
DUTAMAON, Ob LieePhOgee ss cataract ee SS A oe oe oa ors Ee. 
eneth Oh epmme Miipal cavers geen s,s sls cne we desk teawe ce 
Scie Primm menue etme peat sct i ee Phen ee oa 
TAM IMGMeMICEPONCE toree c.f. Dhar ieee ol tS sees! upon ae 
‘Del WE WT FES F010) PS Sia ei le 
HORE eetcinietine ms Sweat seas soos Ses sno ee eae bese dks 
SMI L SOROS PGS TS 2 SERS ae en es ne ee 
LEE TCTR TSO 120 007 a a 
LY OTGS Gi /6 1010) 1 eR Ah a cr 
Length of life cycle of second generation.......................-..... 
eeeO Mie SUMCTAION: 2g a. tay ye ORM eee Ln ls is ay ye als ee Seen ys 
