Wilcoxia pollinosa Wilcox,

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: 411-412

publication ID

https://doi.org/10.11646/zootaxa.4695.5.1

publication LSID

lsid:zoobank.org:pub:A6844BF7-1B08-40D8-AB38-37F1E93B434C

persistent identifier

http://treatment.plazi.org/id/03CD87EE-081F-F041-FF48-FAC8FB139376

treatment provided by

Plazi

scientific name

Wilcoxia pollinosa Wilcox
status

 

4. Wilcoxia pollinosa Wilcox 

( Figs 7–8View FIGURES 5–8, 20View FIGURES 17–25, 29View FIGURES 26–29, 39View FIGURES 38–40, 51–52View FIGURES 47–58, 62View FIGURES 61–62, 67View FIGURES 67–70)

Wilcoxia pollinosa Wilcox 1972: 45  . Type locality: “New Mexico, Chaves Co., 6 mi W Roswell”; Poole & Gentili 1996: 64.

Types. Holotype, male ( CAS), labeled: “[scribbly handwriting] Chaves Co. Sept 15, 65 // 6 mis. west Roswell , N M. // Timberlake Coll. // [blue label] HOLOTYPE ♂ Wilcoxia pollinosa J. Wilcox  // California Academy of Sci- ences Type No. 11660 // permanent deposit from University of California, Riverside // ALLOTYPE IS STORED IN THE GENERAL COLLECTION”. The holotype was not examined (images studied at: http://researcharchive. calacademy.org/research/entomology/typesDB/default.asp). The allotype was examined. 

Derivation of specific epithet. Though not specifically explained by Wilcox (1972) in the original description, it is presumed that the name “ pollinosa  ” refers to the extensive pollinosity on the body of individuals of this species.

Diagnosis. This species may be diagnosed from other species in the cinerea  group by the following combination of characters: scutellum uniformly pollinose, without bare posterior margin; scutum with 2–3 pairs of small, semicircular brownish pollinose patches, contrasting surrounding grey pollinosity; abdominal tergites uniformly pollinose, without extensive bare areas; abdomen long (especially so in males), segment 2 longer than wide.

Description. Male ( Fig. 7View FIGURES 5–8). TL 9.3–9.9 mm; wing 6.5–6.8 mm.

Head ( Fig. 20View FIGURES 17–25) black, covered in pale grey tomentum; face (in profile) even with, or slightly extended beyond eye; hairs and setae of head white, stoutest setae with amber cast; lower occipital hairs relatively short, sparse; ocellar tubercle with 2 setae (ca. length of scape + pedicel), white to slightly yellow in color; mystax ( Fig. 20View FIGURES 17–25) sparse, consisting of long setae (ca. length of postpedicel + style) and slightly shorter hairs, confined to lower ¼ of face; setae and hairs white, bases perpendicular to plane of face; hairs above mystax short, inconspicuous (ca. length of pedicel), projecting downward, with bases ca. 45° or less from plane of face; palpi and proboscis black with white hairs; antennomeres brown to black, pollinose, scape pollinose laterally, bare medially; scape and pedicel with several relatively long ventral setae and several short hairs dorsally; ratio of antennomere lengths (scape: pedicel: postpedicel: style+spine) = 8: 8: 27: 11.

Thorax black, covered in light grey tomentum with yellow to light brown tint; scutum with divided median stripe, dark brown pollinose; acrostichal setae present, 5–6 per row; scutum surface with dark brown circle of tomentum inside supraalar setae and inside notopleural setae; scutum with sparse pile of short white hairs (ca. length of scape), primarily presuturally; 2 notopleural setae, 1 supraalar seta, 1 postalar seta; stoutest thoracic setae with amber cast; scutellum uniformly pale grey pollinose, with slight yellow tint; 2–3 light yellow marginal setae, about length of scutellum, elevated slightly about level of scutellum, parallel to slightly converging medially; several marginal hairs present; disc of scutellum without hairs; pleura pale grey pollinose, with slight yellow tint; katatergite with about 10 long white setae, tips not “crinkly” (e.g., Fig. 44View FIGURES 41–46); wings hyaline, costa complete around entire wing margin; microtrichiae dense and conspicuous on distal half of wing ( Fig. 39View FIGURES 38–40); halter with base yellow and brown, stem and knob yellow; legs ( Figs 7–8View FIGURES 5–8) non-pollinose, largely yellow; tibiae black for approximately distal ¼ and tarsi black; all femora yellow basally, contrasting brown/black trochanters; hind and middle femora black for distal 1/6 but with tips yellow; front femur black for ca. distal half, but extreme tip yellow; leg hairs and setae white, stoutest setae with amber cast; femora dorsally with moderately dense, short white appressed hairs (<femur width); ventrally surface mainly bare, with a few scattered short white hairs (<femur width), basally with 1 or 2 long hairs (> femur width); tibiae with sparse, short (<tibia width) appressed yellowish hairs, ventrally with a few longer, more erect hairs; mesotibial spine blackish-brown; protibiae without sigmoidal spine at apex.

Abdomen ( Figs 7View FIGURES 5–8, 29View FIGURES 26–29) black, pale grey pollinose, with very pale yellow cast, some specimens with pollinosity somewhat lighter on posterior 1/3 of tergites, with sparse short, white hairs; segments relatively narrow, 2–5 longer than wide; tergite 2 largely bare anterad punctillae; tergites 2–5 with narrow bare area along posterodorsal margin, widest medially; pollinosity thin or absent on small elliptical spot medially on tergites 2–5; tergites 3–5 also with small elliptical bare patch laterally; sternites pale grey pollinose with slight yellow cast, with very sparse, short white hairs, not noticeably differing in length from anterior to posterior sternites.

Male genitalia ( Figs 51–52View FIGURES 47–58). Apex of dorsal gonocoxite process entire, not bifid, but with very slight notch subapically; dorsal process extending past apex of ventral gonocoxite process; medial gonocoxite processes relatively thin and acute, but not distinctly curved; gonostylus relatively thin, arcuate, apex not truncate; phallus without subapical denticle on lateral margins; lateral margins evenly narrowed to apex.

Female ( Fig. 8View FIGURES 5–8). TL 10.1–10.6 mm; wing 6.8–7.1 mm. Features similar to male, except for the following: abdomen black with pale yellow-grey pollinosity; the following pattern of bare patches may be distinct or indicated merely by thinned pollinosity, or are largely absent: tergites 2–6 with bare longitudinally oriented ellipses middorsocentral, and also lateral; in some specimens, tergites may have posterior margins narrowly bare of tomentum; tergite 2 may also have 2 additional bare patches anterior of punctillae; tergite 8 bare, non-pollinose.

Natural history. The only information available for W. pollinosa  was obtained from recent collection of several specimens in Chaves Co., New Mexico, just east of Roswell. On 23 and 25 September 2018, individuals were collected by general sweeping of vegetation in an open, semi-desert type habitat ( Fig. 67View FIGURES 67–70). Plant species were not identified, but there was a relatively even mix of grasses, non-grasses, and open sandy substrate. Unfortunately, no specimens were seen in situ, so there was no way of ascertaining which (if any) of the plants were most closely associated with W. pollinosa  . On the days of collection, two other robber fly species were also collected in the same sweep samples: Metapogon punctipennis Coquillett, 1904  and Megaphorus pulcher (Pritchard, 1935)  . Collection date range: 11.viii–25.x.

Distribution ( Fig. 62View FIGURES 61–62). The few specimens examined exhibit a relatively restricted distribution: central to southeastern New Mexico (Chaves, Eddy, Torrance Counties) and into adjacent west Texas (Hudspeth County). The elevations of these localities range from 3272–6507 feet.

Non-type material examined. UNITED STATES OF AMERICA. New Mexico. Chaves Co. 0.5 mi E. off Co. Rd. 1, ca. 3 mi. N. Hwy 70, 33.648925, -104.30499, 23.ix.2018, D. & G. Pollock, swept from vegetation, ( ENMU, 2♂, 1♀); same locality and collectors, 25.ix.2018, ( ENMU, 1♂). Eddy Co. 3.4 mi. NE Sitting Bull Falls [32.267731, -104.66662], Guadalupe Mts. , 3.ix.1986, D. Richman, ( NMSU, 1♂); 0.5 mi. N. State Line, Hwy 180 and 62 [32.001841, -104.524459], 2.x.1962, ( CAS, 1♀)GoogleMaps  . Texas. Hudspeth Co. [31.536671, -105.389663, est.] 30.viii.1940, D.J. & J.N. Knull, ( EMFC, 1♀). Literature records ( Wilcox 1972)GoogleMaps  . New Mexico. Chaves Co. 6 mi. W. Roswell [33.394118, -104.627565], 15.ix.1965 (holotype).GoogleMaps  Eddy Co. 16 mi. S. Artesia [32.608323, -104.401016], 3000–5000 ft., 24.ix.1950.GoogleMaps  Torrance Co. Gran Quivira [34.260603, -106.092376], 11.viii.1931GoogleMaps  .

CAS

California Academy of Sciences

ENMU

Eastern New Mexico University, Natural History Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Asilidae

Genus

Wilcoxia

Loc

Wilcoxia pollinosa Wilcox

Pollock, Darren A. & Reichert, Lisa A. 2019
2019
Loc

Poole, R. W. & Gentili, P. 1996: 64
Wilcox, J. 1972: 45