UNIVERSITY OF CALIFORNIA PUBLICATIONS 



ZOOLOGY 



Vol. 16, No. 10, pp. 1 13-126, plates 14-15 February 18, 1916 



ON TRYPANOSOMA TBI ATOM AE, A NEAV FLA- 

 GELLATE FROM A HEMIPTERAN BUG 

 FROM THE NESTS OF THE WOOD 

 RAT NEOTOMA FUSCIPES 



BY 



CHARLES ATWOOD KOFOID and IRENE McCULLOCH 



\ 

 CONTENTS 



PAGE 



I. Introduction 113 



II. The trypanosome phase 115 



1. The early stomach phase 115 



2. Late stomach phase 116 



III. The c-rithidial phase 117 



1. Transition forms 117 



2. The structure of the crithidial form 119 



3. The roUed-up type 119 



4. The stout type 120 



5. The slender type 121 



IV. Tlie rectal trypanosome phase 121 



V. Comparison with Schizotrypannm cruzi Chagas 122 



VI. Summary 122 



VII. Literature cited 123 



VIII. Explanation of plates 124 



I. Introduction 

 The discovery by Chagas (1909) in Brazilian human trypano- 

 somiasis of a trypanosome which passes one stage in an hemipteran 

 bug, Conorhinus megistus, allied to the so-called " kissing-bug ", has 

 placed all biting Hemiptera which infest mammals under suspicion. 

 For a number of years reports have come to us from time to time, 

 especially from prospectors in the desert regions of California and 

 Arizona, of certain black bugs which infest their shacks and bite the 



