AUTHORS ABSTRACT Ot" THIS PAPKR ISSCED 

 BY THE BIBLIOGRAPHIC SERVICE. JANUARY I. 



ON THE METAMORPHOSIS OF THE MALPIGHIAN 

 TUBES OF BOMBYX MORI L. • 



HIROWO ITO 



Imperial Tokyo Sericultural College, Tokyo, Japan 



FIFTEEN FIGURES 



CONTENTS 



Introduction 195 



Material and methods 196 



Observations 196 



1. Malpighian tubes in larva 196 



2. Malpighian tubes in prepupal stage 199 



3. Malpighian tubes in pupa 200 



4. Malpighian tubes in imago 203 



Summary 205 



■ INTRODUCTION 



The metamorphosis of the malpighian tubes of insects has 

 been much studied by many authors: Karawaiew ('98), Angla-s 

 ('00), Perez ('10), in Hymenoptera; Karawaiew ('99), Deegener 

 ('00) in Coleoptera; Vaney ('02), Perez ('01) in Diptera; Cho- 

 lodkovsky ('87), Samson ('08), Hufnagel ('12), Ikeda ('13) in 

 Lepidoptera. The results so far published are widely divergent, 

 especially for Lepidoptera. 



Cholodkovsky ('87) demonstrated the fact in Tineola biselliela 

 that the malpighian tubes of the larva disappear gradually by 

 histolysis, while the basal trunk elongates to form the imaginal 

 tubes, A diametrically opposite view has been held by Samson 

 ('08), who states that in Heterogenea limacodes that the mal- 

 pighian tubes of the larva directly transform into the imaginal 

 ones, although they undergo certain histological alterations. 



Hufnagel ('12) investigated the metamorphosis of the tubes 

 in Hyponomeuta padella, and came to the conclusion that one 

 part of the larval tubes alone persists and differentiates into the 



195 



JOURNAL OF MORPHOLOGY, VOL. 35, NO. 1 



