Lutrochus Erichson

Maier, Crystal A. & Short, Andrew Edward Z., 2014, Review of the Lutrochidae (Coleoptera) of the Guianas and Lesser Antilles, with description of four new species, Zootaxa 3895 (1) : -

Key to Lutrochus Erichson species of northern South America (after Maier & Short 2013, new taxa listed in BOLD)

1 Mesotibia with apical excavation for reception of tarsus ( Fig. 17)................................................ 2

- Mesotibia lacking apical excavation for reception of tarsus (cf. Maier & Short 2013 Fig. 44)......................... 11

2(1) Elytra explanate, epipleuron appearing broad in ventral aspect (cf. Maier & Short 2013 Fig. 9 ); reddish-brown in color; prosternum strongly deflexed ventrally in anterior half (cf. Maier & Short 2013 Fig. 10 ); apical maxillary palpomere strongly triangular (cf. Maier & Short 2013 Fig. 11 )............................................ Lutrochus acuminatus Grouvelle

- Elytra not explanate, epipleuron appearing narrow in ventral aspect ( Fig. 20 ); dark brown to black in color; prosternum very slightly or not deflexed ventrally in anterior half ( Fig. 20 ); apical maxillary palpomere weakly triangular to disc-shaped (cf. Maier & Short 2013 Figs. 30, 37)......................................................................... 3

3(2) Body size small, total length 2.5–4.5 mm ................................................................... 4

- Body size large, total length 4.6–5.5 mm ................................................................... 8

4(3) Pronotum with lateral borders expanded (cf. Maier & Short 2013 Fig. 35); apical maxillary palpomere rounded to disc-shaped (cf. Maier & Short 2013 Fig. 37); apical metatarsomere setose (cf. Maier & Short 2013 Fig. 38); length 2.5–3.2 mm .................................................................................... L. maldonadoi Maier and Short

- Pronotum with lateral borders smooth with outline of body, not expanded; apical maxillary palpomere triangular (cf. Maier & Short 2013 Fig. 30); apical metatarsomere almost entirely glabrous ( Fig. 10 ); length 3.0– 4.5 mm ..................... 5

5(4) Body strongly wedge-shaped............................................................... L. vestitus Sharp

- Body ovate or weakly wedge-shaped..................................................................... 6

6(5) Apical metatarsomere pubescent for at least half of length when viewed dorsally ( Fig. 22 ); parameres of aedaegus with weak crenulations at border ( Fig 23 )................................................................. L. wao n. sp.

- Apical metatarsomere pubescent for significantly less than half of length when viewed dorsally ( Fig. 10 ); parameres of aedaegus smooth, lacking weak crenulations at border ( Fig 11 )..................................................... 7

7(6) Apical protarsomere two-toned, dark brown to nearly apex, testaceous at apex; femora light brown dorsally and dark brown ventrally; tibiae dark brown ( Fig. 5 ); apex of parameres not extended apically ( Fig 6 ).................... L. funkae n.sp.

- Apical protarsomere, femora, and tibae entirely reddish-brown to testaceous ( Fig 8 ); apex of parameres extended apically ( Fig 11 )............................................................................... L. grenadensis n. sp.

8(3) Apical protarsomere entirely glabrous (cf. Maier & Short 2013 Fig. 23 ).................... L. gustafsoni Maier and Short

- Apical protarsomere at least partially pubescent (cf. Maier & Short 2013 Fig. 18 ).................................. 9

9(8) Apex of protibia of male with distinct patch of long golden setae apically ( Fig. 16)................... L. leeanneae n. sp.

- Apex of protibia of male with setae of similar length on entire surface (cf. Maier & Short 2013 Fig. 15 )............... 10

10(9) Apical protarsomere with discrete pubescent patch in basal third, apical two-thirds glabrous (cf. Maier & Short 2013 Fig. 18 ); body without metallic sheen dorsally (cf. Maier & Short 2013 Fig. 14 )..................... L. cauraensis Maier & Short

- Apical protarsomere pubescent, although more sparse in apical half (cf. Maier & Short 2013 Fig. 58); body with bluish-violet metallic sheen dorsally (cf. Maier & Short 2013 Fig. 55)................................. L. violaceous Maier & Short

11(1) Metasternum with medial circular glabrous patch (cf. Maier & Short 2013 Fig. 45); scutellum diamond-shaped (cf. Maier & Short 2013 Fig. 46); elytron with seven rows of shallow punctures (cf. Maier & Short 2013 Fig. 40); apical maxillary palpomere narrow (cf. Maier & Short 2013 Fig. 43)......................................... L. meridaensis Maier & Short

- Metasternum without medial circular glabrous patch (cf. Maier & Short 2013 Fig. 49); scutellum triangular (cf. Maier & Short 2013 Fig. 48); elytral punctation dense, confused, not in rows (cf. Maier & Short 2013 Fig. 52); apical maxillary palpomere wide (cf. Maier & Short 2013 Fig. 53)................................................. L. minutus Maier & Short

Figures

FIGURE 18. Lutrochus grenadensis n. sp. (St. George population): Aedeagus, dorsal and lateral views, showing probable injury (scale bar = 1.0 mm).

FIGURES 7 – 11. Lutrochus grenadensis n. sp.: 7. Habitus, dorsal view; 8. Habitus, ventral view; 9. Habitus, lateral view; 10. Diagrammatic view of the protibia and tarsus, showing areas of dense pubescence (pubescent areas shaded in gray); 11. Aedeagus, dorsal and lateral views (scale bar = 1.0 mm).

FIGURES 19 – 23. Lutrochus wao n. sp.: 19. Habitus, dorsal view; 20. Habitus, ventral view; 21. Habitus, lateral view; 22. Diagrammatic view of the protibia and tarsus, showing areas of dense pubescence (pubescent areas shaded in gray); 23. Aedeagus, dorsal and lateral views (scale bar = 1.0 mm).

FIGURES 3 – 6. Lutrochus funkae n. sp.: 3. Habitus, dorsal view; 4. Habitus, ventral view; 5. Habitus, lateral view; 6. Aedeagus, dorsal and lateral views (scale bar = 1.0 mm).

FIGURES 12 – 15. Lutrochus leeanneae n. sp.: 12. Habitus, dorsal view; 13. Habitus, ventral view; 14. Habitus, lateral view; 15. Aedeagus, dorsal and lateral views (scale bar = 1.0 mm).