Tropidocephalini, Muir, 1915

Bartlett, Charles R. & Kennedy, Ashley C., 2018, A review of New World Malaxa (Hemiptera: Fulgoroidea: Delphacidae), Zootaxa 4441 (3), pp. 511-528 : 513-514

Key to Genera of New World Tropidocephalini (revised from Bartlett 2009).

1 Body strongly dorsoventrally flattened ( Fig. 34 ); frons rather square, median carinae of frons forked ventrally near lower margin of eyes ( Fig. 35 ).................................................................. Procidelphax Bartlett

- Body not flattened (e.g., Fig. 16 ), frons rectangular, median carinae not forked (e.g., Fig. 17 ), except dorsally near fastigium in some species......................................................................................... 2

2 Vertex much (ca. 1.5x) longer than broad, rounded anteriorly in dorsal view ( Fig. 30 ); median carina of vertex unbranched....................................................................................... Macrocorupha Muir - Vertex shorter ( Figs. 31–32 ), more truncate anteriorly; median carina of vertex variable.............................. 3

3 Antennae very long ( Figs. 10, 12 ), exceeding posterior margin of mesothorax; both segments long (much longer than wide) with segment I nearly ½ length segment II........................................................ Lamaxa n. g.

- Antennae not as long ( Figs 19–20 ), not exceeding mesothorax; generally segment I somewhat longer than wide and 1/3 or less length of II......................................................................................... 4

4 Lateral carinae of pronotum reaching hind margin ( Fig. 31 ); the Y-carina of vertex not distinct, sometimes forming a rounded areolet at apex of the median carina; anal tube with or without processes (a heterogeneous taxon, often strongly marked on body and wings)....................................................................... Columbisoga Muir

- Lateral carinae of pronotum not attaining hind margin ( Fig. 32 ); the Y-carinae of vertex distinct, rounded areolet not present; anal tube without processes............................................................................. 5

5 Wings clear and unmarked (except fuscous at wing base in C. caresi ); head and body uniformly colored ( Fig. 32 ); ventral margin of pygofer with broad forked process (also with a pair of lateral projections in the type species C. lloydi ); aedeagus caudally directed or somewhat twisted, not strongly curved ventrad.................................. Columbiana Muir

- Wings clear, strongly marked with fuscous ( Fig. 21 ); body dark, marked with pale (especially on head; Fig. 23 ); ventral margin of pygofer with broad scoop-like projection (not apically forked; Fig. 27 ) and a pair of lateral teeth; aedeagus strongly downcurved..................................................................................... Xalama n. g.

Figures

FIGURES 30–34. New World Tropidocephalini genera; dorsal view of head and thorax (30–32), frontal view (33), lateral view of head and thorax (34); 30, Macrocorupha sp. (probably new species, Colombia); 31, Columbisoga saracura (holotype); 32, Columbiana sp. (probably new species, Colombia); 33–34 Procidelphax dejecta (paratype).

FIGURES 35–37. Forewing, line art, leading margin ventrad; 35, Malaxa acutipennis; 36, Lamaxa occidentalis; 37, Xalama microstyla.

FIGURES 15–18. Lamaxa gracilis (holotype); 15, habitus, dorsal view; 16, habitus, lateral view; 17 frontal view; 18, labels.

FIGURES 7–14. Lamaxa occidentalis (7–9, 13–14 paratype male, Napo River, Ecuador; 10–12 La Selva Biological Station Costa Rica); 7, habitus dorsal view; 8, habitus lateral view; 9, frontal view; 10 habitus dorsal view; 11, habitus lateral view; 12, frontal view; 13, pygofer, caudal view (embedded in balsam); 14, aedeagus, connectives, gonostyli and anal tube, left lateral view (embedded in balsam).

FIGURES 19–24. Xalama microstyla (19–22 holotype; 23–24 Peru); 19, habitus, dorsal view; 20, frontal view; 21, habitus lateral view; 22, labels; 23, habitus, dorsal view; 24, frontal view.

FIGURES 25–29. Male genitalia of Lamaxa occidentalis (25–26) and Xalama microstyla (27–29); 25, pygofer, semiventral view (note shape of process on ventral margin of pygofer opening); 26, pygofer, left lateral view; 27, pygofer, left lateral view; 28 pygofer, near caudal view; 29, pygofer, ventral view (note shape of process on ventral margin of pygofer opening).