| Step | Case | Chain |
|---|---|---|
| 1 | 1st tergite without ringfurrow | 2 |
| 1st tergite with ringfurrow | 26 | |
| 2 | 1st tarsus of terminal legs with 1 spine | S. calcarata |
| 1st tarsus of terminal legs without spines | 3 | |
| 3 | Coxopleural processes with cylindric tip (usually long & slender, but sometimes also short), with 2-15 spines on each process, often with min. one spine on the side except the spine at caudal margin | 3.1 |
| Coxopleural processes slightly conically narrowed, Sometimes spines on the sides | 11 | |
| 3.1 | 2-4 sparsely hirsute antenna segments | 3.1.1 |
| 5 or more sparsely hirsute antenna segments | 4 | |
| 3.1.1 | 20 antenna segments in total and 4 sparsely hirsute. 21st sternite deeply concave at the end. Tergite 21 without median sulcus. Distribution: Congo | S. langi |
| 17 antenna segments in total and 2-2 1/2 sparsely hirsute. 21sternite truncated at the end. Tergite 21 without median sulcus. Distribution: Korea, Manchuria | S. koreana | |
| 4 | 1st legs with 1 tarsal spine each | 5 |
| 1st legs with 2 tarsal spines each | 6 | |
| 5 | More than 17 antenna segments. 19th legpair with 1 tarsal spine each | 5.1 |
| 17 antenna segments, 19th legs without tarsal spines | S. afer | |
| 5.1 | Antenna with 28 segments in total and 7 sparsely hirsute. Prefemur of terminal legs with 32-37 ventral spines. 21st tergite with median sulcus. Distribution: USA (Southern California), Mexico (West Coast) | S. octodentata |
| 19-21 antenna segments | 5.1.2 | |
| 5.1.2 | 21st tergite without median sulcus. Distribution: Madagascar | S. madagascariensis |
| 21st tergite with median sulcus | 5.1.2.2 | |
| 5.1.2.2 | margination only on 21st tergite | S. indiae |
| margination starts before 21st tergite | 5.1.2.2.2 | |
| 5.1.2.2.2 | Head without noticable basal plates and paramedian sulci. Antenna long, reaching back margin of 6th tergite. 5+5 coxosternal teeth | S. attemsi |