Nylanderia, Kallal & Lapolla, 2012

Kallal, Robert J. & Lapolla, John S., 2012, Monograph of Nylanderia (Hymenoptera: Formicidae) of the World, Part II: Nylanderia in the Nearctic 3508, Zootaxa 3508, pp. 1-64 : 8

Key to Nearctic Nylanderia Males

1. Gaster elongate and cylindrical (figs. 95 & 127)............................................................. 2

- Gaster not elongate or cylindrical (fig. 79).................................................................. 3

2. Parameres long and digitiform; digiti without extra structures or projections (figs. 99 & 100)..................... bruesii

- Parameres triangular with tapered apices; digiti with unique dorsal projections at approximately midlength (figs. 131 & 132).............................................................................................. magnella

3. Digiti and cuspides elongate (figs. 83 & 147)................................................................ 4

- Digiti and cuspides not elongate.......................................................................... 5

4. Overall dark brown in color; scapes with no more than 5 macrosetae (typically scapes with 1–2 macrosetae); digiti and cuspides relatively straight; cuspides nearly as long as digiti (fig. 83 & 84)..................................... arenivaga

- Overall light brown in color; scapes completely lacking macrosetae; digiti curved outward from aedeagal valves, cuspides curved inward toward aedeagal valves; cuspides shorter than digiti (figs. 147 & 148)........................ phantasma

5. Parameres subquadrate with a dorsal notch........................................................ bourbonica

- Parameres triangular without a dorsal notch................................................................ 6

6. Scapes with 0–2 macrosetae; if with 2 macrosetae, then scape length less than 0.55 mm .............................. 7

- Scapes with 2 or more macrosetae; if with 2 macrosetae, then scape length greater than 0.55 mm ....................... 9

7. Scapes with 1–2 macrosetae; 9 th sternite 0.15 mm wide or less (fig. 202)..................................... wojciki

- Scapes without macrosetae; 9 th sternite greater that 0.15 mm wide............................................... 8

8. Overall yellow in color; 9 th sternite triangular, broadening proximally, with long ventral apodeme and short, thin lateral apodemes (fig. 199).................................................................................. trageri

- Overall dark brown in color; 9 th sternite not triangular; lateral apodemes short and broad (fig. 196)................ parvula

9. Segment IV of antennae is distinctly bent (fig. 168).......................................................... 10

- Segment IV of antennae in line with remainder of funicular segments........................................... 11

10. Parameres curving strongly inward; digiti and aedeagal valves not tapering then broadening into rounded tips (fig. 179); 9 th sternite broadening proximally with large, digitiform medial apodeme (fig. 201).............................. vividula

- Parameres not strongly curving inward; digiti and aedeagal valves tapering then broadening into rounded tips (fig. 171); 9 th sternite with tapering, nearly digitiform medial apodeme (fig. 200)........................................ terricola

11. More than 12 macrosetae present on each scape......................................................... hystrix

- Fewer than 12 macrosetae present on each scape............................................................ 12

12. Body bicolored or with darker gaster..................................................................... 13

- Body uniform in color................................................................................. 14

13. Body yellow; 9 th sternite rectangular (fig.198).......................................................... querna

- Body brown; 9 th sternite triangular (fig. 193)........................................................ faisonensis

14. Overall body yellow in color.................................................................. guatemalensis

- Overall body brown in color............................................................................ 15

15. Mesocoxae and metacoxae always whitish, strongly contrasting with brown body............................ steinheili

- Mesocoxae and metacoxae not whitish, not strongly contrasting with body....................................... 16

16. 9 th sternite spade-like, broadening proximally, with very short, broad lateral and ventral apodemes (fig. 192); scapes brown in color......................................................................................... concinna

- 9 th sternite not spade-like or triangular; scapes yellowish in color............................................... 17

17. Mesosoma entirely covered in a dense layer of pubescence.................................................... 18

- Mesosoma with a dense layer of pubescence on dorsum; remainder of mesosoma without pubescence.................. 19

18. Paramere apices triangular and weakly sclerotized (yellow to slightly darker coloration); macrosetae originating from the paramere margin scattered and not fan-like (fig. 203)...................................................... fulva

- Paramere apices rounded and well sclerotized (dark brown coloration); macrosetae originating from the paramere margin in a dense, fan-like configuration (fig. 204)................................................................ pubens

19. Overall body dark brown to black with yellow legs...................................................... flavipes

- Overall body medium brown to reddish brown with legs the same color as body.......................... austroccidua