Melchus Lacordaire

Anderson, Robert S., 2003, Neotropical Dryophthoridae: Redescription of the Genus Melchus Lacordaire with Description of Daisya Anderson, New Genus, and Seven New Species (Coleoptera: Curculionoidea), The Coleopterists Bulletin 57 (4), pp. 413-432 : 416-418

Key to Species of Melchus Lacordaire

1 Rostrum in lateral view distinctly wider at apex than at midlength ( Fig. 15 ); elytra lacking micropilose nodules; peduncle lacking ventrally directed tooth ( Fig. 15 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - M. jolyi Anderson

19 Rostrum in lateral view more or less of equal width throughout length ( Figs. 11– 14 ); elytra with or lacking micropilose nodules; peduncle with ( Figs. 13–14 ) or lacking ( Figs. 11–12 ) ventrally directed tooth - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2

Figs. 1–10 . Continued.

2 Elytra lacking micropilose nodules ( Figs. 3–4 ). Body form broad and very flat, maximum width slightly more than one-half total length; elytra somewhat cordiform, lateral margins distinctly convergent from immediately posterior to humeri to elytral apex ( Fig. 4 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - M. gomezi Anderson

29 Elytra with distinct micropilose nodules ( Figs. 1–2, 5–8 ). Body form less broad or flat, maximum width about one-half total length; elytra more elongate-oval, lateral margins slightly gradually convergent from basal one-quarter to elytral apex ( Figs. 1, 5, 7 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

3 Rostrum in lateral view straight, lacking sinuation at basal one-third; peduncle lacking ventrally directed tooth ( Fig. 11 ). - - - - - - - - - - - - - - - - - - - - - - M. leprosus Lacordaire

39 Rostrum in lateral view with sinuation at basal one-third; peduncle with prominent ventrally directed rounded tooth ( Figs. 13–14 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

4 Rostrum with slight sinuation at basal one-third ( Fig. 14 ); dorsal surface of rostrum near base with small, shallow punctures, median impunctate area broad ( Fig. 17 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - M. perplexus Anderson

49 Rostrum with pronounced sinuation at basal one-third ( Fig. 13 ); dorsal surface of rostrum near base with large, deep punctures, median impunctate area very narrow ( Fig. 16 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - M. onorei Anderson

Figures

Figs. 11–23. Melchus species. 11) M. leprosus, head, lateral view; 12) M. gomezi, head, lateral view; 13) M. onorei, head, lateral view; 14) M. perplexus, head, lateral view; 15) M. jolyi, head, lateral view; 16) M. onorei, rostrum, dorsal view; 17) M. perplexus, rostrum, dorsal view; 18) M. leprosus, antenna, lateral view; 19) M. gomezi, scutellum, dorsal view; 20) M. gomezi, hind tarsus, dorsal view; 21) M. leprosus, tergite 8 and sternite 8, ventral view; 22) M. leprosus, aedeagus, dorsal view; 23) M. leprosus, aedeagus, lateral view. Scale line ¼ 1.0 mm, except tarsus and scutellum, 0.63 mm.

Figs. 1–10. Melchus species. 1) Melchus leprosus, dorsal view; 2) same, lateral view; 3) M. gomezi, dorsal view; 4) same, lateral view; 5) M. onorei, dorsal view; 6) same, lateral view; 7) M. perplexus, dorsal view; 8) Same, lateral view; 9) M. jolyi, dorsal view; 10) Same, lateral view.