Wilcoxia, in Hull, 1962

Pollock, Darren A. & Reichert, Lisa A., 2019, Review of the Nearctic genus Wilcoxia James (Diptera: Asilidae: Stenopogoninae) with descriptions of three new species, Zootaxa 4695 (5), pp. 401-437 : 405-406

Key to species of Wilcoxia

1 Anterior dorsocentral setae of scutum long and erect (≥ length of scape + pedicel) ( Figs 9–16 ); scutellum with 6–14 long, marginal setae, longer than antenna; mystax composed of long hairs of fairly uniform length and stoutness from oral margin to base of antennae ( Figs 21–25 ); abdominal tergites (except male of W. forbesi , with uniformly pollinose tergites) with alternating pollinose and bare areas, vaguely in “checkerboard” pattern ( Figs 30–33, 35–37 ); legs piceous to black with no contrasting, yellowish areas ( Figs 9–16 )............................................................ martinorum group…2

- Anterior dorsocentral setae of scutum short and appressed (about length of scape) ( Figs 1–8 ); scutellum with 2–6 marginal setae, shorter than antenna; mystax with long hairs or setae confined to lower half or less of face ( Figs 17–20 ); abdominal tergites with pollinose areas covering virtually entire tergite ( W. pollinosa only, Fig. 29 ), or present as bands along lateral and/or anterior and/or posterior margins only, not in a “checkerboard” pattern ( Figs 26–28 ); legs with at least tibiae largely yellow ( Figs 1–8 ).............................................................................. cinerea group…5

2 Sexes similar: abdomen grey pollinose; dorsum of tergite 1 with medial bare patch, and tergites 2–6 with bare patches on medial posterior margin, and anterior lateral bare patches ( Figs 30–33, 36–37 )........................................... 3

- Sexes different: male with abdominal tergite 1 bare medially, remainder densely grey pollinose ( Fig. 34 ); mystax of very dense, long white hairs ( Fig. 23 ); female with abdominal tergites 1–5 with lateral pollinosity, expanded toward midline posteriorly; tergites 2–5 with narrow anterior band of pollinosity ( Fig. 35 )................................ W. forbesi , new species

3 Outer lateral surface of all femora not pollinose (in some specimens, extreme distal end only pollinose); usually 2 postalar setae present; in most specimens, pair of short, linear non-pollinose patches present on scutum, between central stripe of scutum and postalar callosities ( Fig. 41 ); knob of halter distinctly pinkish, contrasting yellow stem............ W. apache , new species

- Outer lateral surface of fore femur (in most specimens mid and hind femora also) pollinose; usually 1 postalar seta present; scutum without distinct, non-pollinose areas, or if slightly suggested, then not posterior of scutum midlength; knob of halter yellow, in some specimens with very slight pink tinge, not contrasting yellow stem................................. 4

4 Outer lateral surface of all femora largely pollinose; first abdominal tergite non-pollinose medially, with anterior edge of bare area wider than posterior margin; second abdominal tergite with medial bare area in most specimens isolated from lateral nonpollinose bare areas ( Figs 36–37 ); wings hyaline, without yellow cast........................... W. martinorum Wilcox

- Pollinosity of mid and hind femora confined to distal 1/4 or less (fore femur with more extensive coverage in some specimens); first abdominal tergite as above, but with posterior edge of bare patch wider than anterior edge; second abdominal tergite medial bare area (usually) contiguous with lateral bare areas ( Figs 32–33 ); wings hyaline, with slightly yellow cast........................................................................................... .. W. flavipennis , new species

5 Scutellum uniformly pollinose (e.g., Fig. 41 ); scutum with 2–3 pairs of small, semicircular non-pollinose patches or contrasting pollinose patches; scutellum with 2–3 posterior marginal setae................................................. 6

- Posterior margin of scutellum non-pollinose (e.g., Fig. 42 ); scutum uniformly pollinose, without 2–3 pairs of small, semicircular non-pollinose or contrasting pollinose patches; scutellum with 4–6 posterior marginal setae........................ 7

6 Abdominal segments 1–6 in female, 1–7 in male, with dense yellowish-grey pollinosity; several tergites with thinly pollinose or bare elliptical spots laterally and medially ( Figs 7–8 , 29 ); abdomen long and narrow (especially in male), segment 2 longer than wide; TL 9–11 mm ................................................................. W. pollinosa Wilcox

- Abdominal segments 1–6 in female, 1–7 in male, mostly non-pollinose with narrow lateral margin of grey pollinosity, expanded toward center posteriorly, and grey pollinosity on anterior margins of tergites 2–5 ( Figs 5–6 , 28 ); abdomen relatively shorter and wider, segment 2 wider than long; TL 4–8 mm ............................................. W. painteri Wilcox

7 Ratio of width of face: width of eye ≤ 0.7; femur with extensive piceous area, in females occupying> 1/2 length of femur, in males almost entire femur dark; tibiae with slight distal infuscation in female, in male distal 1/3 to 1/2 of tibiae infuscate, especially so on fore and middle legs ( Figs 1–2 ); wings light brown, almost hyaline in female............... W. cinerea James

- Ratio of width of face: width of eye ≥ 0.8; femur with base and distal ~1/3 yellow-orange, with piceous region between; tibiae entirely yellow-orange, in some specimens slightly infuscated distally, especially on front legs ( Figs 3–4 ); wings medium brown, lighter in female................................................................... W. monae Wilcox

Figures

FIGURES 9–12. Figs 9–10. Male (9) and female (10) paratypes of W. apache, n. sp. Male from Curry Co., NM; female from Chaves Co., NM. Figs. 11–12. Male (11) and female (12) paratypes of W. flavipennis, n. sp. Both specimens from Sonora, Mexico.

FIGURES 13–16. Figs 13–14. Male (13) and female (14) paratypes of W. forbesi, n. sp. Both specimens from Doña Ana Co., NM. Figs 15–16. Male (15) and female (16) paratype of W. martinorum Wilcox. Both specimens from Riverside Co., CA.

FIGURES 17–25. Laterofrontal view of head of Wilcoxia spp. 17. W. cinerea, male. 18. W. monae, male. 19. W. painteri, male. 20. W. pollinosa, male. 21. W. apache, n. sp., male. 22. W. flavipennis, n. sp., male. 23. W. forbesi, n. sp., male. 24. W. forbesi, n. sp., female. 25. W. martinorum, male.

FIGURES 30–37. Abdomens of Wilcoxia spp. (martinorum group), dorsal. 30. W. apache, n. sp., male; 31. W. apache, n. sp., female; 32. W. flavipennis n. sp., male; 33. W. flavipennis, n. sp., female. 34. W. forbesi, n. sp., male. 35. W. forbesi, n. sp., female. 36. W. martinorum, male. 37. W. martinorum, female.

FIGURES 1–4. Figs 1–2. Male (1) and female (2) paratypes of W. cinerea James, nr. Saguache, Saguache Co., CO. Figs 3–4. Male (3) and female (4) paratypes of W. monae Wilcox. Male from Douglas Co., NV; female from type locality, Mono Co., CA.

FIGURES 5–8. Figs 5–6. Male (5) and female (6) paratypes of W. painteri Wilcox. Male from Catron Co., NM; female from Kane Co., UT. Figs 7–8. Male (7) and Allotype female (8) of W. pollinosa Wilcox. Male from Chaves Co., NM; Allotype from Eddy Co., NM.

FIGURES 26–29. Abdomens of Wilcoxia spp. (cinerea group), dorsal. 26. W. cinerea, male; 27. W. monae, male; 28. W. painteri, female; 29. W. pollinosa, male.

FIGURES 41–46. Figs 41–42. Detail of posterior scutum and scutellum. 41. W. apache, n. sp. showing uniformly pollinose scutellum and many marginal setae as well as the linear, non-pollinose patches on scutum. 42. W. monae, showing posteriorly non-pollinose scutellum and relatively few marginal setae. Figs 43–44. Katatergite setation. 43. W. apache, n. sp. male, with “crinkly” setae. 44. W. cinerea, female, with “non-crinkly” setae. Fig. 45–46. Apical tibial spurs. 45. W. painteri, female, sigmoidal apicoventral spur on front tibia. 46. W. apache, n. sp., male, stout spur at apex of middle tibia.