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Key to species of the genus Themonocoris
1. Small, pale species, total length about 4 mm; femora mostly pale → T. kinkalanus
- Dark species; total length at least 4.5 mm; femora at least 2/3 dark to black → 2
2. Third antennal segment relatively short, less than 2.5 times the length of the second segment; setigerous spines on head and anterior half of pronotum, very short, wide, spherical → T. bambesanus
- Third antennal segment longer, more than 2.8 times the length of the second segment; mentioned spines longer or very small → 3
3. Head relatively long, about 1.5 times as long as broad; third antennal segment about 3 × second segment; femora usually almost entirely dark to black (sometimes with a median light annulus), never with a light apical area; [tibiae light brown to pale (fore leg) with more or less distinct basal and apical annuli; posterior margin of head and anterior part of pronotum without large spines] → T. endroedyi spec. nov.
- Head relatively short, about 1.25 times as long (excluding neck) as broad (across eyes); length of third antennal segment almost 4 × second (3.55); femora apically lighter → 4
4. Femora black basally, apical 1/4-1/5 yellow; tibiae pale with a subbasal and apical brown ring; posterior margin of head and anterior part of pronotum with remarkably large setigerous spines → T. tshikapanus
- Femora dark brown basally, apical half yellow with a dorsal dark spot or annulus halfway; tibiae blackish; spines of posterior margin of head and anterior part of pronotum smaller → T. aethiopicus