AUTHOR S ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, DECEMBER 27 



STUDIES ON MICROSPORIDIA, WITH SPECIAL REFER- 

 ENCE TO THOSE PARASITIC IN MOSQUITOES^ 



R. KUDO 



ONE TEXT FIGURE AND FIVE PLATES (ONE HUNDRED SEVENTEEN FIGUREs) 



CONTENTS 



Introduction 153 



Historical review of the microsporidian parasites of mosquitoes 154 



Method of investigation 156 



Thelohania magna Kudo, parasitic in Culex pipiens 156 



Thelohania illinoisensis nov. spec, parasitic in Anopheles punctipennis . . . 167 



Nosema baetis nov. spec, parasitic in Baetis sp.(?) 171 



The effect of the parasites upon the hosts 176 



Significance of the microsporidian parasites among some aquatic insects.. 178 



Summary 179 



Bibliography 180 



Explanation of figures 183 



INTRODUCTION 



In a short note, the writer ('20) reported his observations on 

 the structure of the spore of a new microsporidian parasite, 

 Thelohania magna Kudo, from the larvae of Culex pipiens col- 

 lected in the vicinity of Urbana, Illinois. The present paper 

 deals with further observations on the same parasite and on 

 two other Microsporidia found in other aquatic insects from the 

 same locality. The study is fragmentary and the results seem to 

 be far from complete. Yet two of these interesting parasites 

 attack the larvae of two species of mosquitoes and appear to 

 play a more or less important role upon the larval existence of 

 these harmful insects. The results of observations up to date 

 have been summarized, and are presented here to call the atten- 

 tion not only of the investigators of Microsporidia, but also of 

 those who may be interested in economic entomology. 



1 Contributions from the Zoological Laboratory of the University of Illinois, 

 no. 169. 



153 



