Erebomyia exalloptera Runyon & Hurley

Hurley, Richard L. & Runyon, Justin B., 2009, A review of Erebomyia (Diptera: Dolichopodidae), with descriptions of three new species, Zootaxa 2054, pp. 38-48 : 44

Erebomyia exalloptera Runyon & Hurley

( Figs. 1–2 , 6–7 )

Description. See Runyon & Hurley (2004) for habitus photo. Male: Body length: 4.0– 4.5 mm; Wing 3.5–4.0 mm x 1.75–2.0 mm. Head: Face dense gray pollinose; narrowed to width of 1 ommatidium or less just above midpoint, wider above and below. Vertex blue-green, to brownish-green, with some magenta reflections; with moderately dense gray pollen. Ocellar setae long, subequal in length to dc setae. Outer vertical setae twothirds length of ocellars. Palpus yellow-brown, somewhat elongate, rounded apically; with long, slender, yellow-brown setae. Scape cylindrical, slightly longer than first flagellomere; mostly yellow, often partly brownish. Pedicel mostly yellow, often slightly brown. First flagellomere ( Fig. 2 ) short triangular, a little longer than wide; somewhat rounded apically. Thorax: Mesonotum dark brown, with green/blue reflections; with moderately dense gray to brownish-gray pollen. Pleura blue-green with sparse gray pollen. Metepisternum and metepimeron largely yellow. Proepisternum with 2–3 short, white hairs on upper half, and 2 long white setae on lower half. Thorax with 8–12 slender ac, length about one-third of dc. Postpronotal hairs well developed, relatively long. Legs: Coxa I with moderately dense, yellow anterior hairs. Coxa II with bluegreen color of pleura continued onto extreme base dorsally, and diffusely along ad edge. Tibia II with ad setae at 1/3, 2/3; with pd seta near 1/3. Tibia III with ad seta near 1/3, sometimes also at 2/3; with row of 5–7 short ventral setae; row of short setae dorsally on apical two-thirds. Ratios of tibia:tarsomeres for leg I: 24-17-8-5 - 4-2; for leg II: 30-21-9-6 -3-2; for leg III: 42-9-14-7 -4-2. Wings ( Fig. 1 ): asymmetrical; both broad with apex mucronate; with branches of R2+3 and R4+5 crowded towards anterior edge; with R4+5 ending well before apex; M1 undulating beyond posterior crossvein. Right wing excavate posterior to apex, left larger and wing smoothly convex; crossvein dm-cu occurring more distal in left wing. Costa with short, stiff spines, especially between R2+3 and M1; with cluster of 3–5 minute hairs at apex. Abdomen: dark brown, with extensive yellow on T2, usually T3, and sometimes on T4. T2 with long, slender setae over entire surface (longest laterally). Hypopygium ( Figs. 6–7 ); cerci broad at base, narrowed on apical two-thirds, with 2–3 long yellow setae at apex.

Female: Body length: 3.75–4.5 mm; wing: 3.5–4.25 mm x 1.5–2.0 mm. The following characters should separate females of this species: femur III with preapical anterior seta greater than or equal to width of femur at insertion; wing rather narrow (length distinctly greater than 2 times width); bend in section of M1 beyond crossvein dm–cu occurring at or just basal to termination of CuA1 at wing margin.

Remarks: E. exalloptera is known from two sites in southeastern Arizona: Madera Canyon in the Santa Rita Mountains and Wet Canyon in the Pinaleno Mountains (see Discussion).

Figures

FIGURE 1. Erebomyia exalloptera, overlay of left (larger wing, on top) and right wings of male.

FIGURE 2. Erebomyia exalloptera, left lateral view. Arrow indicates left postpronotal hairs on anterior slope of scutum.

FIGURES 6 – 8. Erebomyia genitalia. 6. E. exalloptera, ventral view; 7. E. exalloptera, left lateral view; 8. E. ramseyensis, left lateral view. Abbreviations: bac scl—bacilliform sclerite, cerc—cercus, dsur—dorsal lobe of surstylus, ej apod—ejaculatory apodeme, epand — epandrium, hypd—hypandrium, hypd arm—hypandrial arm, pgt—postgonite, ph—phallus, S 8 — sternite 8, vsur—ventral lobe of surstylus.