122 V iiivffsii y of ('ciliforiiia I'uhlicaiions in Zoologii Y\o\..\ii 



protracta roimded-iip forms (pi. 15, figs. 45—47), with some evidenee 

 for their activity in rounding up, with the flagellum peripheral as in 

 the rounding-up phase in the stomach. The authors quoted regard 

 these forms as a normal part of the haptomonad phase. The possi- 

 bility of cysts or latent bodies may well be kept open. 



V. Comparison With Schizotrypanum cruzi Chagas 



The species we have here described as Trypanosoma triatomac has 

 much in common wath the form previously described by Chagas (1909) 

 as Srliizotri/panuin crtisi from ('onorhinus megistus Burmeister from 

 Brazil. It resembles it in the trypanosome, erithidial, and trypani- 

 form stages. It resembles the trypanosome stage in its asymmetrical, 

 elongated nucleus, but may be a trifle larger and stouter. The eri- 

 thidial stages are quite similar in the spherical, vesicular niicleus with 

 radial chromatic strands from the central karyosome, in the trans- 

 verse parabasal, and in the fan-shaped parabasal rhizoplast. It may 

 be somewhat blunter and more clavate posteriorly. The rectal try- 

 paniform stages are, so far as known, more divergent. They appear 

 to have more elongate nuclei and to be more slender in pi-oportions. 

 In view of these differences, it seems best to give separate specific 

 status to the form from Triatoma protracta. We know too little of 

 the life-historj' in both this form and of Schizotrypanum cruzi to stress 

 the apparent differences between the two. We have found as yet no 

 forms in the body cavity or the salivai-y glands. It is also obvious, 

 in the light of Minchin and Thomson's (1915) failure to find sexual 

 reproduction in Trypanosoma lewisi, that a re-examination of Schizo- 

 trypanum is desirable, especially since the distinctions between this 

 genus and Trypanosoma are less obvious now than formerly. 



VI. Summary 



1. Triatoma protractus Uhler, a hemipteran bug found in the 

 nests of the wood rat, Neotoma fuscipes, harbors in its digestive tract 

 a trypanosome, Trypanosoma triatomae sp. nov., which is found in its 

 stomach with blood possibly derived from the wood rat. 



2. The digestive tract of the bug also contains erithidial and try- 

 paniform stages which are probably later forms in the cycle in the 

 invertebrate host. 



3. The trypanosome and erithidial stages are remarkably similar 

 to the corresponding stages in the cycle of Schizotrypanum cruzi 



