1. From insects or ticks. a. From the tse-tse fl}^ (Glossina palpalis). 18. Borrelia glossinae. aa. From ticks. b'. From Ornithodoros brasiliensis. 19. Borrelia brasiliensis. b^. From Ornithodoros dugesi. 20. Borrelia dugesii. b^. From Ornithodoros graingeri. 21. Borrelia graingeri. b*. From Ornithodoros tholozani var. babylonensis . 22. Borrelia babylonensis. 2. From animals other than insects or ticks. a. From rodents. b. From the shrew-mouse {Crocidura stampflii). 23. Borrelia crocidurae. bb. From gerbilles. c. Transmitted hy Ornithodoros erraticus (small form). 24. Borrelia dipodilli. cc. Transmitted by Ornithodoros tartakovskyi . 25. Borrelia latyschewii. aa. From animals other than rodents. b. From non-primates. c. From non-ruminants. 26. Borrelia hyos. cc. From ruminants. 27. Borrelia theileri. bb. From primates. 28. Borrelia harveyi. 1. Borrelia anserina (Sakharoff, 1891) Source: Isolated from the blood of in- Bergey et al., 1925. (Spirochaeta anserina fected geese, ducks, fowls and vector ticks. Sakharoff, Ann. Inst. Past., 5, 1891, 564; Habitat: Found as the cause of spiroche- Spiroschaudinnia anserina Castellani and tosis of fowls. Chalmers, Man. Trop. Med., 2nd ed., 1913, 403; Bergey et al.. Manual, 2nd ed., 1925, 2. Borrelia recurrentis (Lebert, 1874) 435.) Bergey et al., 1925. (See Obermeier, Berlin. an.se.ri'na. L. adj. anserinus pertaining klin. Wochnschr., 1873, 152; Protomycetum to geese. recurrentis Lebert, Ziemssen's Handbuch, Cells, 0.25 to 0.3 by 8.0 to 20.0 microns, 3, 1874, 267; Spiroschaudinnia recurrentis averaging about one spiral per micron. Ac- Castellani and Chalmers, Man. Trop. Med., tively motile by means of lashing move- 2nd ed., 1913, 398; Bergey et al.. Manual, ments. Stain readily with aniline dyes and 2nd ed., 1925, 433.) Giemsa's stain. re. cur. ren 'tis. L. part. adj. recurrens, Growth occurs in Noguchi's ascitic fluid recurrentis recurring. rabbit kidney medium. Cylindrical or slightly flattened cells, Antigenically distinct from the species 0.35 to 0.5 by 8.0 to 16.0 microns, with of this genus found in mammals. pointed ends. Spirals are large, wavy, in- Pathogenic for birds but not for mammals, constant, about 5 in number. Spiral ampli- Transmitted by the bites of ticks {Argas tude, 1.5 microns. Terminal, finely spiral persicus, A. miniatus, A. reflexus and Or- filaments are present. Motile by means of nithodoros moubata). an active, cork-screw motion without po-
