KEY TO THE SPECIES OF Nigeriella

a

1A

Antennal flagellum with long, flexible sensilla, and a few placoid sensilla; mandible as in fig a, ex F. abutilifolia ................................................................................................ Nigeriella  fusciceps Wiebes

a

1B

Antennal flagellum with placoid sensilla (attached for whole length to antennal segment) (fig. a) .......... 2

a

2A

Mandible with nineteen ventral ridges, the appendage with ca. 26 lamellae that distally become distinctly denticulate (fig a), ex F. pseudomangifera ............................................. Nigeriella letouzeyi Wiebes

a

b

c

2B

Mandible with four to eight ventral ridges, the appendage with two rows of 10 - 20 teeth (figs a, b & c) ............................................................................................................................................. 3

a

b

c

3A

Scape with produced, but bluntly convex ventral edge with small tooth at the base (fig. a) ; mandibular appendage narrow, 6X longer than wide (figs. b); postmarginal vein 1.7X longer than the stigmal vein; pronotum with deep, V-shaped posterior invagination extending to anterior edge (fig. c), host unknown   ................. ........................................................................................ Nigeriella scindura van Noort

a

b

3B

Scape with prominent, sharp ventral projection; mandibular appendage broader, 2.5-3.3X longer than wide (figs a & b); postmarginal vein at most 1.5X length of stigmal vein; pronotum either entire or with weak posterior invagination not extending to anterior edge ........................................................... 4

a

4A

Mandibular appendage 2.5X longer than wide, with eleven teeth on each edge (fig a); postmarginal vein subequal in length to the stigmal vein; pronotum with medial V-shaped posterior invagination extending to anterior margin as suture, ex F. rubra .........................................................   Nigeriella avicola Wiebes

a

4B

Mandibular appendage 3.3X longer than wide, with seventeen teeth on each edge (fig a); postmarginal vein much longer (1.5X) than the stigmal vein; pronotum entire, shallowly concave on posterior margin, ex F. tettensis ...............................................................................................  Nigeriella excavata Compton