Tylodinus mutabilis Luna-Cozar & Anderson & Jones & León-Cortés 2014

Tylodinus mutabilis species group (2)

Tylodinus mutabilis new species; México (Chiapas: La Concordia, Villacorzo)

Tylodinus parvus new species; México (Chiapas: Trinitaria)

Tylodinus nodulosus species group (3)

Tylodinus andersoni new species; México (Chiapas: Ángel Albino Corzo)

Tylodinus nodulosus (Boheman) 1837; México

Tylodinus zilchi Kuschel 1956; El Salvador, Honduras

Tylodinus pusillus species group (2)

Tylodinus porvenirensis new species; México (Chiapas: El Porvenir)

Tylodinus pusillus new species; México (Chiapas: Ángel Albino Corzo, La Concordia, Unión Juárez) Tylodinus spiniventris species group (2)

Tylodinus lum new species; México (Chiapas: Coapilla, San Cristóbal de las Casas)

Tylodinus spiniventris new species; México (Chiapas: Huixtán, San Cristóbal de las Casas, Pueblo Nuevo Solistahuacán).

Incertae sedis (13)

Tylodinus complicatus new species; México (Chiapas: Bochil, Coapilla, El Bosque, Rayón, Tapalapa) Tylodinus dominicus new species; México (Chiapas: Villacorzo)

Tylodinus noctis new species; México (Chiapas: Coapilla, Rayón)

Tylodinus rufus new species; México (Chiapas: Chalchihuitán, Coapilla, Huixtán, San Cristóbal de las Casa, San Juan Chamula, Tapalapa)

Tylodinus branstetteri new species; México (Chiapas: La Concordia)

Tylodinus kuscheli new species; México (Chiapas: Villacorzo)

Tylodinus pappi new species; México (Chiapas: Unión Juárez)

Tylodinus gibbosus new species; México (Chiapas: Pueblo Nuevo Solistahuacán)

Tylodinus immundus new species; México (Chiapas: San Cristóbal de las Casas)

Tylodinus intzin new species; México (Chiapas: Bochil, Chalchihuitán, El Bosque, Pueblo Nuevo Solistahuacán, Rayón, Tenejapa, Trinitaria)

Tylodinus elongatus new species; México (Chiapas: Angel Albino Corzo)

Tylodinus kissingeri new species; México (Chiapas: Chalchihuitán, Tapalapa)

Tylodinus pinguis new species; México (Chiapas: Ángel Albino Corzo, La Concordia)

Key to species and species groups of Tylodinus Champion from Chiapas

1 Elytral declivity with laminate or elongate tubercles (Figures 29, 31, 33, 96–97).................................... 2

- Elytral declivity with rounded tubercles (Figures 34–95).......................................................3

2(1) Pronotal disc at most slightly longitudinally impressed; elytra disc with rounded tubercles (Figures. 96–97).................................................................................................. T. pinguis Luna-Cozar

- Pronotal disc deeply excavate medially; elytra disc with laminate tubercles (especially that at base of I2, Figures 28–33).................................................................................... T. nodulosus species group

3(1) Pronotal disc without impressions; base of elytra declivity with a transverse fringe of white scales (Figures 40–51)........................................................................................ T. buchanani species group

- Pronotal disc with a longitudinal impression; elytra declivity without white scales (Figures 34–39, 52–95)............... 4

4(3) Elytra black with dark red coloration at base, along interval 2 and on elytral declivity from interval 1 to 5 (Figures 64–67, 74–79).............................................................................................. 5

- Elytra black (Figures 52–63, 68–73, 80–95)................................................................. 8

5(4) Hind tibiae with an external tooth (Figure 26)............................................................... 6

- Hind tibiae without an external tooth...................................................................... 7

6(5) Metasternal tooth absent; premucro present; with a patch of yellow scales between eyes.......... T. dominicus Luna-Cozar

- Metasternal tooth present (Figure 19); premucro absent; scales between eyes similar to scales on head and rostrum......................................................................................... T. mutabilis species group

7(5) Pronotum red (Figures 76–77)............................................................ T. rufus Luna-Cozar

- Pronotum black (Figures 74–75)..................................................... T. complicatus Luna-Cozar

8(4) Front and middle tibiae (less so in female) very deeply preapically excavate (Fig. 27); pronotum and rostrum rugose (Figures 34–39)........................................................................... T. cavicrus species group

- Front and middle tibiae not deeply excavate, generally straight or slightly curved to sinuate; pronotum and rostrum not rugos. .................................................................................................... 9

9(8) Hind tibiae with an external tooth (Figure 26)........................................ T. canaliculatus species group

- Hind tibiae without an external tooth..................................................................... 10

10(9) Body very elongate, 2.7 x as long as wide; abdomen longer, as long as the distance from the apex of head to the posterior edge of metasternum (Figures 72–73)....................................................... T. elongatus Luna-Cozar

- Body not so elongate; abdomen shorter than the length from head to posterior edge of metasternum................... 11

11(10) Body length longer than 3.5 mm .........................................................................12

- Body length 3.5 mm or less............................................................................. 14

12 (11) Median section of ventrite 2 glabrous; tubercles on base of elytral declivity similar in size (Figures 60–63).............................................................................................. T. spiniventris species group

- Median section of ventrite 2 with a transverse line of scales along midline, occasionally interrupted medially (Figures 23–24); base of elytral declivity with tubercle on interval 4 longer than tubercle on interval 2............................... 13

13(12) Pronotum in dorsal view with very dense whitish scales on lateral sides; ventrite 1 with scales only on anterior margin, median section glabrous (Figures 94–95)...................................................... T. kissingeri Luna-Cozar

- Pronotum in dorsal view with very dense yellow to light brown scales on lateral sides; ventrite 1 squamous (Figures 82–83).................................................................................... T. kuscheli Luna-Cozar

14(11) Elytra strongly convex in lateral view; body completely clothed with gray and whitish scales (Figures 92–93)............................................................................................... T. gibbosus Luna-Cozar

- Elytra not strongly convex (Figures 87, 89, 91); body clothed with dark brown scales, yellow or light brown, if whitish scales are present, then is in patches or scattered and intermixed..................................................... 15

15(14) Body clothed with dark brown or black scales with whitish scales denser along lateral margins of pronotal disc and tubercles in front of elytral declivity (Figures 52–55)............................................. T. coapillensis species group

- Body without whitish scales............................................................................ 16

16(15) Base of elytral declivity without tubercles on interval 2 (Figures 90–91).......................... T. intzin Luna-Cozar

- Base of elytral declivity with a tubercle on interval 2 (Figures 68–71, 85, 87)..................................... 17

17(16) Ventrite 2 squamous................................................................ T. immundus Luna-Cozar

- Ventrite 2 glabrous in median section or with a transverse line of scales along midline.............................. 18

18(17) Ventrite 1 squamous................................................................... T. pappi Luna-Cozar

- Ventrite 1 with scales only on anterior margin, median section glabrous (Figures 20, 25)............................ 19

19(18) Punctures on pronotal disc uniformly dense at the base, progressively more widely spaced, becoming smaller and shallower at apex (Figures 14); base of elytral declivity with tubercle on interval 2 as long as tubercle on interval 4; dermis shiny, metasternum concave..................................................................... .. T. pusillus species group

- Punctures on pronotal disc dense to contiguous on sides, progressively more widely spaced and less conspicuous in the median, anterior and posterior sections (Figure 15); base of elytral declivity with tubercle on interval 2 longer or smaller than tubercle on interval 4.................................................................................. 20

20(19) Base of elytral declivity with tubercle on interval 2 longer than tubercle on interval 4; coloration of body scales predominantly light brown (Figures 86–87)........................................................ T. branstetteri Luna-Cozar

- Base of elytral declivity with tubercle on interval 2 smaller than tubercle on interval 4; coloration of body scales predominantly dark brown (Figures 80–81)............................................................. T. noctis Luna-Cozar