Erebomyia ramseyensis Hurley & Runyon

Hurley, Richard L. & Runyon, Justin B., 2009, A review of Erebomyia (Diptera: Dolichopodidae), with descriptions of three new species, Zootaxa 2054, pp. 38-48 : 44-46

Erebomyia ramseyensis Hurley & Runyon , n. sp.

( Figs. 5 , 8 )

Description. Male: Body length: 3.0– 3.5 mm; Wing 2.5–3.0 mm x 1.25–1.50 mm. Head: Face dense dark gray pollinose; obliterated broadly near midpoint by encroaching eyes; narrow, recessed on lower one-fifth. Vertex blue-green, with moderately dense gray pollen. Ocellar setae long, subequal in size to dc setae. Outer verticals one-half to two-thirds length of ocellar setae. Palpus small, yellow-brown, triangular, with dark hairs. Scape cylindrical, long (length equal to length of first flagellomere), yellow to yellow-brown. Pedicel yellow to yellow-brown. First flagellomere elongate triangular (length 2 times width), with apex rather rounded. Thorax: Mesonotum dark brown, with blue and/or green reflections; with sparse rusty-gray pollen. Pleura blue-green with moderately dense gray pollen. Dorsal metepisternum often brown; metepimeron blue-green dorsally. Postpronotal hairs relatively short. Proepisternum with 2–3 short, pale, hairs on upper half, 2 similarsized hairs on lower half. Thorax with 6–10 slender ac, about one-half length of dc setae. Legs: Coxa I anteriorly with sparse, very short yellow hairs. Tibia II with long ad setae at 1/3 and 2/3; with long pd seta near 1/3. Tibia III with all setae short (less than or equal to width of tibia III); with 0–2 ad setae; row of 4–6 dorsal setae; with 4–6 very short ventral setae. Tarsomere I(2–4) slightly flattened ventrally. Ratios of tibia:tarsomeres for leg I: 16-12-5-3 -3-2; for leg II: 20-14-6-4 -3-2; for leg III: 27-6-10-5-3 -2. Wing ( Fig. 5 ): veins R2+3 and R4+5 slightly divergent, crowded anteriorly and ending well before wing tip; M1undulating beyond posterior crossvein, with sharp anterior bend near apex. Costa irregularly thickened beyond R4+5; with short, erect hairs and long, hooked cilia between tips of R4+5 and M1 (longest equal to length of posterior crossvein); these cilia more or less fused apically into various hooked clumps, most notably at two places: just beyond R4+5 with resulting compound, hooked “seta” projecting dorsally, and just before M1 which projects anteriorly. Abdomen: dark brown with extensive paler areas on T2, T3, sometimes T4. T2 laterally with long, slender yellow to brown setae. Hypopygium ( Fig. 8 ); cerci very slightly narrowed apically, with 1 long seta at apex and 1–2 long setae just before apex.

Female: Body length: 3.25–3.5 mm; wing: 3.5–3.75 mm x 1.50–1.75 mm. Can be distinguished from all other species by the short preapical anterior seta on femur III which is less than width of femur at insertion.

Etymology: Erebomyia ramseyensis is named for Ramsey Canyon in southeastern Arizona, the type locality. The Nature Conservancy graciously permitted us to collect in their Ramsey Canyon preserve, and the majority of specimens were taken there.

Holotype: 3: ARIZONA: Cochise Co., Ramsey Canyon, Huachuca Mtns., 5500 feet, 16-IV-2003, J. Runyon & R. Hurley. Deposited: CAS.

Paratypes: 32 3, 9 Ƥ, same data as holotype; 12 3, 4 Ƥ, same data as holotype except 23-IV-2002; ARIZONA: Cochise Co.: 18 3, 5 Ƥ, South Fork Cave Creek, Chiricahua Mtns., 17-IV-2003, 5235 feet, J. Runyon & R. Hurley; Santa Cruz Co.: 14 3, 9 Ƥ, Madera Canyon, 5100 feet, 14-IV-2003, J. Runyon & R. Hurley; 1 3, same except 25-IV-2001; 3 3, Madera Canyon, 14-IV-1962, Paul A. Rude; 1 3, Santa Rita Mtns., Coronado Nat. Forest, Madera Canyon, 3-VI-1991, ex. bog spring, 6000 feet, B.J. Sinclair; Cochise Co.: 1 3, Cave Creek, 5785 feet, 7 mi. SW Portal, Chiricahua Mtns., 24-IV-2002, R. Hurley & J. Runyon; 1 3, 2 Ƥ, Miller Canyon, Huachuca Mtns., 5700 feet, 16-IV-2003, J. Runyon & R. Hurley; Pima Co.: 1 3, 4 Ƥ, Bear Creek, 5200 feet, 14 mi. NE Tucson, 26-IV-2001, R. Hurley & J. Runyon; Graham Co.: 7 3, 13 Ƥ, Wet Canyon, Jacobson Creek, 5900 feet, Pinaleno Mtns., 25-IV-2002, R. Hurley & J. Runyon; 1 3, 1 Ƥ, same except 26-IV-2001.

Paratypes (3 and Ƥ) to be deposited: CAS, CNC, FSCA, EMEC, USNM; remainder in MTEC.

Remarks: Erebomyia ramseyensis is locally abundant and widely distributed in the ‘sky island’ mountains of southeastern Arizona (Chiricahua, Huachuca, Pinaleno, Santa Catalina, and Santa Rita mountains).

Figures

FIGURES 3 – 5. Erebomyia, male wings. 3. E. akidoptera; 4. E. aetheoptera; 5. E. ramseyensis. Note: in wing of E. aetheoptera, the anterodistal and posterobasal margins are slightly bent forward (toward reader).

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.