Callichrotus, Leschen & Chen & Harmer, 2024

Key to species of flightless New Zealand Picrotini

Remarks. All species covered in this treatment are included below. Callichrotus gen. nov. runs to couplet 2 with Picrotus in the key in GIMMEL & LESCHEN (2022).

1. Body elongate ( Fig. 13A View Fig ), pronotum with narrow lateral bead, antennal club of 3 antennomeres. ............. .......................................... 2 ( Thortus Broun, 1893 )

– Body ovate ( Fig. 1B View Fig ), pronotum with wide lateral bead and a deep sublateral groove, antennal club of 2 antennomeres. ........................................................ 14

2. Abdominal postcoxal lines absent ( Fig. 13B View Fig ), at most a wide bead may be present. .................................... 3

– Abdominal postcoxal lines present ( Fig. 7B View Fig ). ......... 4

3. Eye well developed and multifacetted; body length over 2.0 mm ( Fig. 13A View Fig ); Auckland Islands. ............... ................................................ T. michauxi sp. nov.

– Eye unifacetted ( Fig. 19D View Fig ); body length less than 2.0 mm; Northland. ........................ T. helmorei sp. nov.

4. Eye poorly developed, consisting of 6 or 7 facets or less ( Fig. 19D View Fig ). ........................................................ 5

– Eye well developed, consisting of 10 or more facets ( Fig. 19E View Fig ). ............................................................... 8

5. Body bicoloured, pronotum darker than elytron ( Fig. 8A View Fig ). ........................................... T. crowsoni sp. nov.

– Body unicoloured. ................................................... 6

6. Head and pronotum coarsely punctured ( Fig. 12A View Fig ). .. ...................................................... T. luscus sp. nov.

– Head and pronotum weakly punctured ( Fig. 17A View Fig ). … 7

7. Eye unifacetted ( Fig. 19D View Fig ); sides of pronotum weakly convex, widest at apical 1/3 ( Fig. 17A View Fig ). .................... ................................................... T. simplex sp. nov.

– Eye consisting of 7 facets; sides of pronotum converging anteriorly, widest at basal 1/3 ( Fig. 10A View Fig ). .......... ........................................................ T. latus sp. nov.

8. Pronotum with distinct impression at middle ( Fig.18A View Fig ); Southland. ................ T. sulcatus sp. nov.

– Pronotum lacking impression at middle ( Fig. 19A View Fig ). .. ................................................................................ 9

9. Sides of pronotum distinctly parallel-sided throughout its length ( Fig. 19A View Fig ); elytron with parasutural stria always present, complete or incomplete. ....... 10

– Sides of pronotum weakly convex ( Fig. 6A View Fig ) or parallel-sided only at base ( Fig. 16A View Fig ); elytron with parasutural stria incomplete or absent. ......................... 12

10. Elytron with parasutural stria incomplete ( Fig. 19A View Fig ); posterior pronotal angles acute. ...... T. tioripatea sp. nov.

– Elytron with parasutural stria complete ( Fig. 6A View Fig ); posterior pronotal angles rounded. ............................ 11

11. Width of frons narrower than width of antennomere 1 ( Fig. 6C View Fig ); metaventrite coarsely punctate; tarsomeres 5-5- 4 in male and 5-5- 5 in female. ............................. ....................................... T. amoenus ( Broun, 1912)

– Width of frons about as wide as width of antennomere 1 ( Fig. 11C View Fig ); metaventrite moderately punctate; tarsomeres 4-4- 4 in both sexes. ........... T. lobatus sp. nov.

12. Pronotum widest at middle or at anterior 1/3 ( Fig. 7A View Fig ), anterolateral edge of lateral carina visible in dorsal view; body unicoloured. ............................. 13

– Pronotum widest in posterior 1/3 ( Fig. 14A View Fig ), anterolateral edge of lateral carina hidden in dorsal view; body typically bicoloured. ...... T. ovalis Broun, 1893

13. Pronotum weakly convergent towards base ( Fig. 7A View Fig ), widest at anterior 1/3; scutellar shield strongly transverse, about 2.5 times wider than long; abdominal postcoxal lines weakly divergent. ..................................... .............................................. T. bullerensis sp. nov.

– Pronotum subparallel-sided at base ( Fig. 16A View Fig ), widest at middle; scutellar shield about 2.0 times wider than long; abdominal postcoxal lines parallel. ................... ................................................ T. parallelus sp. nov.

14. Clypeus constricted between antennal insertions ( Fig. 3C View Fig ), eye distant from antennal fossa ( Fig. 3C View Fig ), antennomere 10 transverse, abdominal ventrites free. ... 15

– Clypeus not constricted between antennal insertions ( Fig. 1C View Fig ), eye contacting antennal fossa ( Fig. 1C View Fig ), abdominal ventrites 1 and 2 connate, antennomere 10 not transverse. ..... Callichrotus gimmeli gen. & sp. nov.

15. Pronotal disc with basomedial puncture ( Fig. 3A View Fig ), prosternal process with apex truncate, widely distributed in North and South Island. ................................ ............................. Picrotus thoracicus Sharp, 1886

– Pronotal disc without basomedial puncture ( Fig. 5A View Fig ), prosternal process with apex rounded; restricted to the Wairarapa. ............................... P. wairarapa sp. nov.