Chrysomelidae, , Takizawa, 2003

Clark, Shawn M., Lillrose, Tiffany & Belo Neto, Luiz A., 2013, Leaf Beetles of the Cayman Islands (Coleoptera: Chrysomelidae), Insecta Mundi 2013 (279), pp. 1-41 : 3-4

Key to Cayman Islands Chrysomelidae

1.

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Terminal abdominal tergite forming easily visible pygidium, not covered by elytra; hind femora much broader than those of front and middle legs; eyes of most species deeply emarginate; pronotum and elytra of most species densely pubescent ................................................................ ...................................................... Bruchinae (this subfamily not included in this study)

If pygidium exposed and hind femora much enlarged, then elytra glabrous and eye not deeply emarginate ........................................................................................................................................ 2

2(1).

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Lateral bead of prothorax absent; prothorax broadest at base and apex, strongly constricted near mid-length; each leg with tarsal claws connate (contiguous in basal half); elytra bicolored, black and yellow ( Fig. 1, 2); length 5.5-6.5 mm .......................... Lema trabeata Lacordaire

Lateral bead of prothorax well developed; prothorax not distinctly constricted near mid-length; tarsal claws divergent from base to apex ...................................................................................... 3

3(2).

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Head opisthognathous, with front or vertex projecting strongly forward; tarsal formula 4-4-4; abdominal ventrites 1 and 2 connate, although suture between them indicated by groove ... 4

Head usually normal, prognathous or hypognathous, with front or vertex not projecting strongly forward; tarsal formula 5-5-5, pseudotetramerous, with penultimate tarsomere minute and usually hidden between lobes of tarsomere 3; abdominal ventrites 1 and 2 usually free ........ 7

4(3).

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Body narrow, more than twice as long as broad ( Fig. 3); margins of pronotum and elytra not explanate; antennae porrect, not retractable; elytra strongly carinate and rather coarsely punctate; head, ventral surfaces, antennae, legs, and at least distal area of elytra black; prothorax and at least basal area of elytra red or orange; length 5.8-7.3 mm .............................................. ......................................................................................... Chalepus sanguinicollis (Linnaeus)

Body in dorsal view round or oval, less than twice as long as broad ( Fig. 4, 5); margins of pronotum and elytra explanate; antennae capable of retraction; elytra not strongly carinate or coarsely punctate; coloration not as above .................................................................................. 5

5(4).

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Clypeus (area between antennae and labrum) forming transverse ridge; all tarsal claws simple, clearly without basal appendages; elytral punctures denser ( Fig. 4); length 9.5-10.5 mm ....... ............................................................................................ Physonota jamaicensis (Linnaeus)

Clypeus longer, flat, somewhat semicircular; either some tarsal claws (at least those of front legs) appendiculate, or tarsal claws simple but appearing appendiculate due to projecting flanks of terminal tarsomere; elytral punctures sparser ( Fig. 5); size smaller, 4.0-5.5 long .............. 6

6(5).

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Base of elytra behind pronotum finely crenulate; prothorax next to head with short groove bordered laterally by short carina; tarsal claws simple, although appearing appendiculate due to projecting flanks of terminal tarsomere; color extremely variable, but usually with anterolateral corners of elytra dark ( Fig. 5); length 5.5 mm ........................................... Deloyala guttata (Olivier)

Base of elytra smooth; prothorax without groove next to head; tarsal claws (at least those of front legs) appendiculate; anterolateral corners of elytra pale; length 4.0- 4.8 mm .................... ............................................................................................. Charidotella jamaicensis (Blake)

7(3).

Abdomen with ventrites 2 to 4 usually strongly shortened mesally; body subcylindrical, compact ( Fig. 25-32); head deeply inserted into prothorax, vertically flattened; pygidium exposed; antennal —

insertions separated from each other by distance much greater than length of basal antennomere ........................................................................................................................................................... 8

Abdomen with intermediate ventrites not abnormally shortened; body not subcylindrical; head less deeply inserted into prothorax; exposed pygidium absent, except in some species with antennae separated by distance not greater than length of basal antennomere .................... 14

8(7).

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Base of pronotum crenulate, without elevated margin (this character sometimes hidden by base of elytra); front femora similar in size to those of middle legs ................................................... 9

Base of pronotum margined by easily visible elevated ridge; front femora much thicker than those of middle legs........................................................................................................................ 13

9(8).

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