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Additional Observations on Trypanosoma Cruzi Chagas, from Arizona in Insects, Rodents, and Experimentally Infected Animals¹

1. Two new Arizona localities, Casa Grande and Continental, are reported for the recovery of Triatoma naturally infected with Trypanosoma cruzi.

2. Natural infection of Triatoma protracta and T. protracta woodi are recorded for the first time from Arizona.

3. The first naturally infected mammals determined by xenodiagnosis are reported from Arizona.

4. Laboratory mammals experimentally infected with Congress, Continental, Casa Grande and Nogales sources of Trypanosoma cruzi are recorded.

5. Leishmanial development in experimental mammals is demonstrated for Congress, Continental, Casa Grande and Nogales sources.

6. Sixty-three, or 7.1 per cent, of 883 Triatoma from Arizona have been found naturally infected with Trypanosoma cruzi Chagas.

¹ The writer thanks Mr. W. J. Cummings for the insects and mammals received, Mr. Gerhard Bakker and Warren Morton for technical assistance in collecting, Mr. Kenneth Stager of the Los Angeles County Museum for identification of most of the mammals, Mrs. Betty Schuck Davis for collection of insects and identification of mice from the Tres de Mayo Mine, Mr. Denny Constantine for blood smears from Arizona bats, and Dr. Fae D. Wood for her skillful execution of the drawings and critical reading of the manuscript.