Key to species of the genus Aulacophora from Taiwan

1. Elytron yellowish brown, some with black spots, or black elytron with yellow apex................................ 2

- Whole elytron black................................................................................... 7

2. Whole elytron yellowish brown.......................................................................... 3

- Elytron yellowish brown with black spots or black elytron with yellow apex...................................... 5

3. First antennomere enlarged and elytra with erect hairs behind elytra humerus in male; cone-like pygidium projecting elytral apex in female; scutellum yellowish bown.................................................................. 4

- Without such sexually secondary characters; scutellum blackish brown.................................... A. tibialis

4. With a pair of tubercles on pronotum in male; pygidium slender and black in female....................... A. kotoensis

- Without tubercles on pronotum in male; pygidium wide and yellowish brown............................. .. A. indica

5. Elytron yellow with two big black square patches, one at humerus and the other at apical 1/3................... A. analis

- Not such patterns...................................................................................... 6

6. Elytron yellow with one black spot on humerus; or two transverse rows of black spots, anterior row composed of two spots, one at humerus, the other near suture, posterior row composed of transverse band (Figs 18, 20); some with posterior rows con- nected with each other (Fig. 21); some with basal 1/4 black and one pair of small yellow spots at base near humerus, and pos- terior rows connected with each other (Fig. 22) or separated bands (Fig. 24); some with anterior row composed of two spots and apical half black (Fig. 23); some with basal 2/3 (Fig. 25) or most of elytra black (Fig. 26) but with one pair of small yellow spots near humerus............................................................................. A. bicolor

- Basal 1/3 (Fig. 125), 2/3 (Fig. 126), or most of elytra (Fig. 123) black without yellow spots at base, meso- and metathoracic and abdominal ventrites black; or black elytron with yellow apical margin extending into middle (Fig. 124), meso- and metathoracic and abdominal ventrites yellow......................................................... A. tibialis

7. Meso- and metathoracic ventrites, and legs black................................................... A. nigripennis

- Whole ventral surface yellow........................................................................... 8

8. Antennomeres III to V filiform in both sexes............................................................... 9

- Antennomeres III to V triangular in male................................................................ 10

9. Elytron opaque (Fig. 80); antenna of male more slender than female; apical margin of abdominal ventrite V truncate in female......................................................................................... A. opacipennis

- Elytron shining (Figs 73, 75); antenna of male wider than female; apical margin of abdominal ventrite V sinuate in female............................................................................................... A. lewisii

10. Antennomere III longer than wide, and vertex with longitudinal groove (Fig. 111) in male; antennomeres VII to X relatively wider than that of A. palliata (2.8–3.2 times longer than wide) in female................................. A. frontalis

- Antennomere III long as wide, and ventex with transverse ridges (Fig. 112) in male; antennomeres VIII to X relatively slender than that of A. frontalis (3.5–3.7 times longer than wide) in female....................................... A. palliata