Hepatozoon guttata n. sp. is described from the corn snake (Elaphe guttata guttata) from south Florida. Gamonts average 14.6 × 4.6 (13–17 × 3.5–6) and are not recurved, with nucleus situated in the second quarter of the gamont. Erythrocyte cytoplasm rarely appears partially dehemoglobinized. The infected cells are usually distorted and are longer than the uninfected erythrocytes but do not differ in width; nuclei are smaller in length and width than those of uninfected cells. Sporogony in Aedes aegypti occurs within the head and the thorax but rarely in the abdomen. Oocysts are spherical to usually ovoid, 87.2 × 75.9 (45–155 × 40–152.5) and contain on average 7.1 (2–32) sporocysts. Sporocysts are spherical to ovoid, 34.8 × 31.0 (20–55 × 17.5–47.5), with 45.7 (14–89) sporozoites contained within. The pigmy rattlesnake (Sistrurus miliarius barbouri) in south Florida is parasitized by H. sistruri n. sp. Gamonts average 14.1 × 5.6 (12.6–15.8 × 4.7–6.3) in breadth and are not recurved, with the nucleus always situated in the second quarter of the gamont commonly at the midbody. Erythrocyte cytoplasm is not dehemoglobinized. The infected cells are always distorted and similar in length to the uninfected cells but with greater width and enlarged nuclei. Sporogony in A. aegypti occurs within head, thorax, and abdomen. Oocysts are spherical to usually ovoid, 163.6 × 154.7 (92–245 × 82–240) and contain 27.4 (12–42) sporocysts. Sporocysts are round to usually ovoid, 39.7 × 33.5 (25–50 × 20–50), with 45.7 (19–70) sporozoites.
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