Key to described species of Cangshanaltica Konstantinov, Chamorro, Prathapan, Ge & Yang

1 Pronotum and elytra differently colored or elytra with a color pattern (Figs 4,6,7).................................. 2

- Pronotum and elytra unicolorous......................................................................... 5

2 Elytra black or dark blackish-brown with yellowish spots in basal and humeral parts and a yellowish brown stripe along epipleura; elytral apices yellowish brown (Median lobe of aedeagus widened towards apex; Fig. 6)... C. marginata sp. nov.

- Elytra with a dark spot or spots.......................................................................... 3

3 Each elytron brownish ochraceous with a dark central spot (Antennomeres VII—XI distinctly elongated; Fig. 4)........................................................................................... C. guanxiensis sp. nov.

- Elytra yellow with multiple dark spots.................................................................... 4

4 Elytra with 6 dark spots.................................................. C. ogatai Takemoto & Suenaga, 2021

- Elytra with 4 dark spots (Fig. 7)......................... A species complex related to C. ogatai distributed in Taiwan.

5 Dorsum without, or with a feeble metallic luster............................................................ 6

- Dorsum with a strong blue or green metallic luster......................................................... 11

6 Length greater than 1.5 mm in males, 1.7 mm in females..................................................... 7

- Body minute, length less than or equal to 1.5 mm in males, 1.7 mm in females.................................... 9

7 Dorsum brown....................................................................................... 8

- Dorsum black with feeble greenish metallic luster (median lobe of aedeagus gradually narrowing towards apex; Fig. 2)...................................................... C. nigra Konstantinov, Chamorro, Prathapan, Ge & Yang, 2013

8 Dorsum chestnut brown; antennae flattened,; median lobe of aedeagus elongate and slender with sharp parallel margins on dorsal side, pointed; antennomere XI distinctly paler than X (Fig. 5)................... Cangshanaltica javana sp. nov.

- Dorsum dark brown; median lobe of aedeagus shorter, parallel-sided without distinct sharp margins, apex blunt; antennomere XI only slightly paler than X, antennae almost unicolorous chestnut brown... C. siamensis Damaška & Konstantinov, 2016 .

9 Body circular; median lobe of aedeagus with blunt apex; spermathecal receptacle short.................................................................................................... C. sprynari Damaška & Aston, 2019

- Body oval; median lobe of aedeagus with apex pointed; spermathecal receptacle oval-elongate...................... 10

10 Median lobe of aedeagus much slenderer in apical third, then gradually narrowing towards apex, basal part wide and bulbose........................................................... C. fuanensis Ruan, Konstantinov & Damaška, 2022

- Median lobe of aedeagus slightly narrowing towards apex, almost parallel-sided, apex arrow-like, basal part not strongly widened (Fig 3)................................................................. C. castanea (Gruev, 1985)

11 Median lobe of aedeagus narrower, narrowing towards apex; spermathecal duct with coils; metallic luster violet-blue; elytra almost impunctate; tibial spur length same or less than length of metatarsomere II.............................................................................................. C. luzonica Damaška, Mohagan & Fikáček, 2020

- Median lobe of aedeagus wider, parallel-sided; spermathecal duct without coils; elytra irregularly but distinctly punctate; metallic luster greenish; tibial spur longer than metatarsomere II... C. mindanaoensis Damaška, Mohagan & Fikáček, 2020