UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 18, No. 5, pp. 75-88, 35 text figures December 29, 1917 



CRITHIDIA EURYOPHTHALMI, SP. NOV., 



FROM THE HEMIPTERAN BUG, 



EURYOPHTHALMUS CONVIVUS STAL 



BY 



IRENE Mcculloch 



CONTENTS 



PAGE 



Introduction 75 



Comparison of Crithidia Jeptocoridis and C. euryophthalmi 76 



Morphology of the digestive tract of Euryophthalmus convivus 78 



Infection of the digestive tract of Euryophthalmus convivus by Crithidia 



euryophthalmi 81 



Life cycle of Crithidia euryophthalmi 82 



Forms from the crop 83 



Oval spore forms 83 



Developing crithidial stages 83 



Multiple fission 83 



Somatella 83 



Internal or endogenous budding 84 



Binary fission 84 



Forms from the mid-stomach - 85 



Forms from the pyloric expansion 85 



Nectomonads 86 



Haptomonads 86 



Eectal forms 86 



Infective and degenerative cycles 87 



Summary 87 



Literature cited 88 



Introduction 



During the late summer and early fall, large numbers of Eur 

 ophthalmiis convivus can be found 'feeding upon Lupinus arhoreus 

 Sims, one of the common lupines growing on the sand dunes of San 

 Francisco near Golden Gate Park. Many bugs can also be detected 



