Key to species of Telegeusis

1 Body yellow-amber, elytra short, not extending past first sternite; palpi not longer than antennae..................... 2

- Body black to brownish-red or yellow; elytra long, extending past first two sternites, five times as long as wide; palpi longer than antennae....................................................................................... 10

2 Elytra shorter, not surpassing apex of hind coxae............................................................. 3

- Elytra surpassing apex of hind coxae, nearly four times as long as wide........................................... 9

3 Elytra not reaching hind coxae, almost as long as wide; body yellow; palpi, apex of elytra and pronotal margin whitish........................................................................................... T. schwarzi Barber

- Elytra reaching apex of hind coxae, almost three times as long as wide........................................... 4

4 Body length 3.5 to 4.5, black or brown..................................................................... 5

- Body length 5 to 6.5, amber or yellow..................................................................... 6

5 Body length 4.5, black; occipital region, genae, gula, labrum and pronotum orange........... T. texensis Fleenor and Taber

- Body length 3.5, brown-dark; pronotum yellow, basal part of the legs yellow............ T. panamensis Allen and Huntton

6 Last maxillary and labial palpomeres longer than antennae, body length 3.28 to 8.................................. 7

- Last maxillary and labial palpomeres not longer than antennae, body length 3.28 to nearly 6......................... 8

7 Body yellow, length 7 to 8; last maxillary and labial palpomeres yellow............................. T. nunifer Martin

- Body amber, length 3.28 to 4.6; last maxillary and labial palpomeres black........................... T. austellus sp. n.

8 Maxillary and labial palpi brown, as long as antennae, body length 4.76 to 5.96................... T. sonorensis sp. nov.

- Maxillary and labial palpi black, shorter than antenna, body length 3.88 to 4.52........................ T. boreios sp. n.

9 Eyes small; frons wide; maxillary and labial palpi brown, longer than antennae (Fig. 9)................. T. glessum sp. n.

- Eyes prominent; frons narrow; maxillary and labial palpi black or brown, slightly shorter than antennae (Fig. 1)............................................................................................ T. chamelensis Zaragoza

10 Body yellow; elytra narrowed in apical half; head nearly twice as long as pronotum.................... T. debilis Horn

- Body black to brown dark; elytra subparallel; head as long as pronotum......................................... 11

11 Integument of head chagrined, bright, partially dotted; body black or brown dark, length 4.96 to 6.16....................................................................................................... T. orientalis Zaragoza

- Head flat, rough, coarsely punctuate (Fig. 10); body length 5.78.................................. T. granulatus sp. n.