[Objectives] Sinospelaeobdella wulingensis and Haemadipsa tianmushana are two species of terrestrial blood-sucking leeches with roughly sympatric distribution in the Wuling Mountain region and surrounding ranges. The former inhabits karstic caves while the latter resides in open environments outside caves, thus facing distinct microhabitat conditions and food availability. [Methods] In this study, 2.5% glutaraldehyde fixing solution and anhydrous ethanol gradient dehydration were employed to prepare the samples of S. wulingensis from Shuiniu Cave in Jishou City, Hunan Province and the samples of H. tianmushana from Hunan Baiyunshan National Nature Reserve in Baojing County, western Hunan Province. The oral suckers of the two leech species were scanned and photographed by scanning electron microscopy (SEM). Image J, Excel, and SPSS 27.0 were used for data measurement and statistical analysis of the observed receptors. The normality of the measured data was assessed by the Shapiro-Wilk test, and the homogeneity of variance was evaluated by the Levene’s test. For comparisons between groups, the t-test was employed. All data were expressed as mean ± SD, and P < 0.05 was considered statistically significant. [Results] The chemoreceptors associated with foraging and feeding of the two leech species were remarkably similar to those found in aquatic leeches. On the dorsal margin of the upper lip of the oral sucker of S. wulingensis, approximately 70 round large chemoreceptors with the diameter of 18.04 ± 2.08 μm were distributed in a band, corresponding to the radial ribs on the oral sucker, and the central regions of these receptors contained either solitary or multiple-in-bundle sensory cilia (Fig. 1). In H. tianmushana, two types of circular chemoreceptors were identified—similar in morphology but different in size, with the central regions of these receptors containing either solitary or multiple-in-bundle sensory cilia (Figs. 2, 3). The large chemoreceptors had the diameter of 17.28 ± 1.53 μm, with similar shape, size, and distribution as those in the dorsal margin of the upper lip of S. wulingensis, and their number was about 90 (Fig. 2). In contrast, small receptors, with the diameter of 8.08 ± 0.48 μm, were observed mainly in the oral sucker and its adjacent epidermis (Fig. 3). In addition, some pore structures (measuring 0.78 ~ 1.15 μm, possibly involved in mucus secretion) were observed on the oral sucker epidermis of both species. [Conclusion] The number of large chemoreceptors in S. wulingensis is lower than that in H. tianmushana, which may be the result of long-term adaptation to the cave environment (Figs. 1﹣3). From an ultrastructural perspective, the chemoreceptors associated with foraging in the oral suckers of these two terrestrial blood-sucking leeches are examined and compared, which provides essential data for future studies on functional morphology, foraging behavioral ecology, and adaptive evolution of leeches.