Notosacantha

Borowiec, Lech & Tirant, Stephane Le, 2013, A new species of Notosacantha Chevrolat (Coleoptera: Chrysomelidae: Cassidinae: Notosacanthini) from southern India, Zootaxa 3694 (3), pp. 289-395 : 293-294

Key to the species of Notosacantha from southern India and Sri Lanka

1 Elytra with distinct radial costae of principal tubercle but without longitudinal costae................................ 2

- Elytra with both radial costae of principal tubercle and longitudinal costae....................................... 4

2(1) Basal tubercle without humeral branch..................................................................... 3

- Basal tubercle with humeral branch................................................... N. indicola (Spaeth, 1933)

3(2) Apical costa rudimentary, forming only short branch from apical tubercle...................... N. horni (Spaeth, 1914)

- Apical costa complete................................................... N. nathani Borowiec & Takizawa, 1991

4(1) At least part of ventrites, part of legs and antennal scape yellowish to reddish-brown................................ 5

- Ventrites, legs and antennae black............................................ N. maduraensis Świętojańska, 2006 a

5(4) Basal tubercle with humeral branch...................................................................... 6

- Basal tubercle without humeral branch..................................................................... 8

6(5) Anterior and posterior branches of dorsal costa converging at different points...................................... 7

- Anterior and posterior branches of dorsal costa converging at the same point................... N. tenella (Spaeth, 1913)

7(6) Ventrites, legs and antennae yellowish-red. Elytra reddish-brown with darker disc and paler explanate margin. Frontal plate extended laterally........................................................ N. rubromarginata (Boheman, 1856)

- Thorax black, legs partly dark brown, antennal club brown. Elytra dark brown, explanate margin in the middle with broad, pale, fenestrate spot extending to the margin of elytron. Frontal plate subtriangular............. N. corneola (Spaeth, 1913)

8(5) Principal tubercle not swollen, triangular in profile with acute apex, or absent.................................... 9

- Principal tubercle swollen with obtuse apex....................................... N. bifenestrella (Boheman, 1862)

9(8) Apical costa reduced.................................................................................. 10

- Apical costa complete................................................................................. 12

10(9) Sides of pronotum broadly rounded with straight basal angles................................................ 11

- Sides of pronotum narrowly rounded, angulate............................................ N. clura (Spaeth, 1913)

11(10) Large, length above 7 mm. Explanate margin of elytra without fenestrate spot. Elytral disc brown with black spots between humeral and basal tubercle and on principal tubercles..................................... N. templetoni (Baly, 1859)

- Small, length approximately 5 mm. Explanate margin with pale fenestrate spot. Elytral disc dark brown, without black spots................................................................................ N. andrewesi (Weise, 1905)

12(9) Large species, length above 7 mm ....................................................................... 13

- Small species, length below 6.5 mm ..................................................................... 14

13(12) Furca interna low but complete thus principal tubercle with five radial costae. Elytral pattern with black spot below the humerus and a large posterolateral irregular area from just behind the middle to the apex of each elytron.......................................................................................... N. quinquecarinata (Maulik, 1919)

- Furca interna incomplete, not extending to lateral costa thus principal tubercle with four radial costae. Elytral pattern with black spots at principal tubercles and behind apical costae............... N. bertounesquei Borowiec & Le Tirant sp. nov.

14(12) Anterior and posterior branches of dorsal costa converging at the same point. Length 5–6 mm ...................... 15

- Anterior and posterior branches of dorsal costa converging at different points. Length approximately 4.5 mm ............................................................................................... N. vicaria (Spaeth, 1913)

15(14) Principal tubercle high, at least as high as half width at base, triangular in profile, acute at apex. Sides of pronotum narrowly rounded, without basal angles........................................................................... 16

- Principal tubercle very low, only slightly higher than dorsal costa, obtuse at apex. Sides of pronotum broadly rounded but with marked basal angles................................................................. N. lenta (Spaeth, 1913)

16(15) Elytral sides distinctly converging posterad. Postbasal tubercle distinctly smaller than basal. Humeral costa distinct, sharp.................................................................................. N. severini (Spaeth, 1913)

- Elytral sides regularly rounded. Postbasal tubercle not or only slightly smaller than basal. Humeral costa indistinct, obtuse.............................................................................. N. horrifica (Boheman, 1856)