Drymeia acrostichalis, Sorokina, Vera S. & Pont, Adrian C., 2015

Sorokina, Vera S. & Pont, Adrian C., 2015, A review of the genus Drymeia Meigen, 1826 (Diptera: Muscidae) in Russia, Zootaxa 4000 (2), pp. 151-206 : 157-160

Drymeia acrostichalis sp. nov.

Figs. 1 A–H

Diagnosis. The species is very similar to D. vicana ( Harris, 1780) . Males of the new species can be distinguished as follows: prealar absent; anepimeron and katepimeron bare; proboscis thickened, short; eye bare; scutum with two pairs of long strong presutural acrostichal setae; mid femur straight, with rows of fine dense anteroventral and posteroventral setae; hind femur with dense, long, weak posteroventrals on basal ¾; hind tibia with a short apical posteroventral seta.

Etymology. The species name refers to the strong and long presutural acrostichal setae on the scutum.

Type material examined. Holotype male, RUSSIA: Altai Republic, Kosh-Agachskii raion, Ukok plateau, environs of Muzdy-Bulak lake, 2400 m, 49.28ºN 87.65ºЕ, 2.vii.2005, V. Sorokina ( SZMN).

Paratypes: 12 males, same data as holotype (1 male each in ZMUM, ZIN, OUMNH, BMNH, BUIC rest in SZMN); Altai Republic, Kosh-Agachskii raion: Ukok plateau: 1 male, environs of Muzdy-Bulak lake, 2400–2600 m, 49.28ºN 87.65ºЕ, 26.vi.2005, A. Barkalov ( SZMN); 1 male and 2 females, 8 km NE Maitobe mountain, 2420 m, 49°34'N 87°43'E, 6.vii.2006, T. Novgorodova ( SZMN); 15 females, valley of Ak-Allacha River, 2160 m, 49°25'N 87°37'E, 12–14.vii.2006, V. Sorokina & T. Novgorodova; 30 females, 10–18 km SE Dzhazator, 1790– 2115 m, 49°39'N 87°39'E, 5.vii.2006, V. Sorokina (2 females each in ZMUM, ZIN, OUMNH, BMNH, BUIC rest in SZMN); 5 females, upper part of Zhumaly River, Rodonovyi spring, 2410 m, 49°27'N 88°03'E, 23.vii.2006, T. Novgorodova; 4 females, south slope of Yuzhno-Chuyskii range, valley of Tara River, 2200 м, 49°39'N 88°13'E, 11.vii.2009, V. Sorokina; 3 females, 7 km NW Kuray, 2251–2588 m, 50º18'N 87º51'E, 17.vii.2013, V. Sorokina & T. Novgorodova; 2 females, 1 km NW Kuray, 1546 m, 50º15'N 87º53'E, 20.vii.2013, T. Novgorodova; 7 females, north slope of Severo-Chuyskii range, valley of Akturu River, 1865–2064 m, 50º08'N 87º48'E, 21.vii.2013, V. Sorokina; Altai Republic, Ulaganskii raion: 8 females, 3 km S Aktash, 1360 m, 50°28'N 88°67'E, 21.vi.2005, V. Sorokina; 1 female, environs of Dzhulukul’ lake, 2200 m, 50.47ºN 89.77ºЕ, 21.vii.2007, V. Sorokina; Altai Republic, Ust’-Koksinskii raion: 2 females, environs of Mul’ta, 915 m, 50º09'N 86º00'E, 11.vii.2013, V. Sorokina; 1 female, 15 km S Mul’ta, 1557 m, 50º03'N 86º51'E, 12.vii.2013, T. Novgorodova. Khakasiya: 1 female, Shirinskii raion, environs Shira salt lake, 350–355 m, 54.48ºN 90.17ºE, 21–24.vi.2011, K. Tomkovich ( ZMUM); 3 females, Shirinskii raion, Shira-Itkul’ lake env., 54.45ºN 90.18ºE, tophill Betuletum, 25–28.vi.2011, K. Tomkovich ( ZMUM). Tyva Republic: Morgun-Tayginskii kozhuun, 4 males, 2 females, environs of Mugur-Aksy, 2000–2100 m, ~ 50º22'N 90º25'E, 22.vii.1993, A. Barkalov; Ovyurskii kozhuun, 6 females, 14 km N Khandagaity, 1600 m, ~ 50º43'N 92º04'E, 25.vii.1993, A. Barkalov; Tes-Khemskii kozhuun, 1 male, 2 females, 1.5 km, W Samagaltay, ~ 50º36'N 95º00'E, 13–14.vii.1993, A. Barkalov ( SZMN). Republic of Buryatia: Selenginskii raion, 1 female, Taezhny village, Temnik River, 51°12'N 103°43'E, 4.vii.1984, B. Zakharov; Kyakhtinskii raion, 1 female, Chikoy River, Dureny village, 10.vii.1986, B. Zakharov. Zabaykalsky Krai: 4 females, Nature Reserve “Sokhondinskii”, Verkhnii Bukukun cordon, ~ 49º36'N 111º06'E, 1540 m, 20.vi.1991, B. Zakharov, 4 female, 16 km NW Bukukun village, confluence of the Ernistyi [=Ernichnyi] Klyuch stream and Bukukun River, 1200–1300 m, ~ 49º34'N 111º00'E, 22.vi., 10.vii.1991, B. Zakharov ( SZMN). Sakha Republic: Tomponskii ulus, 1 female, 232 km NE from Khandyga, ~ 63º20'N 140º00'E, 10.vii.1985, A. Barkalov.

Description. MALE. Length of body, 4.5–6.5 mm. Length of wing, 4.0– 5.2 mm.

Head: Ground-colour black. Eye bare. Fronto-orbital plate and parafacial silver pruinose; face grey, gena and lower occiput light grey pruinose. Fronto-orbital plates touching. Frons at narrowest point as broad as diameter of anterior ocellus. Ocellar setae short. 13–15 pairs of frontal setae, including interstitials, reaching almost to anterior ocellus. Antenna black, postpedicel circa 1.3 times as long as wide. Arista swollen in basal sixth, appearing almost bare, the longest hairs shorter than basal diameter of arista. Parafacial at level of insertion of arista slightly narrower than width of postpedicel, hardly narrowing below. Upper part of face without a distinct carina between antennal bases. In lateral view, facial edge not projecting forward beyond the level of profrons, sometimes behind profrons. Gena broad, depth below lowest eye-margin equal to or slightly broader than length of postpedicel, densely setose and with a group of upcurved setae on anterior part of genal dilation. Palpus black. Proboscis thickened, short. Prementum of proboscis dusted, as long as palpus.

Thorax: Ground-colour black. Scutum matt, black with brown dust, viewed from in front without distinct longitudinal vittae, but with narrow undusted lines along the postsutural dorsocentrals and acrostichals and sometimes with two grey presutural vittae; postpronotal lobe, notopleuron and postalar callus brown dusted. Ground-setulae short. Pleura light brownish-grey dusted, with a shining patch anteriorly on katepisternum and medially on meron. Anepimeron and katepimeron bare. Notopleuron densely setulose. Prosternum bare. Acrostichals 2(4)+1, strong, long (but often first two presutural pairs shorter and weak). Dorsocentrals 2+4. Prealar absent. Katepisternal setae 1+1. Scutellum black and light dusted in posterior view.

Legs: Black. Fore tibia with 2–3 posteroventral setae on apical half. Fore tarsomeres 1–4 each with a short fine anteroventral and posteroventral hair at tip, fore tarsomere 1 without posteroventrals at apex. Fore claws as long as length of tarsomere 5, thin and pointed, but often short, blunt and obviously broken, shorter than length of tarsomere 5. Pulvilli as long as tarsomere 5. Mid femur straight, slightly flattened, with rows of fine dense anteroventral and posteroventral setae, the posteroventrals longer than anteroventrals; anterior surface with a row of long strong setae on basal half; 0 anterior and 1–2 posterodorsal to posterior preapical setae. Mid tibia with 1–2 anterodorsal setae and without anteroventrals; 3–4 posterodorsals, 1–2 posteroventrals. Hind femur with long dense setae on anteroventral, posteroventral and ventral surfaces on basal 2/3; with 7–9 strong anteroventral setae on apical half. Hind tibia with 3–4 long posterodorsals at middle and some short setae between them; with a row of 5–7 uneven anterodorsals; 3–4 anteroventrals on middle part; without posterior and posteroventrals; without a ventral apical prong, with a dorsal and an anterodorsal preapical; with an anterior and anteroventral apical seta but without a posteroventral apical. Hind tarsomere 1 with 2 short ventral setae at base.

Wing: Light brownish, darker at base. Basicosta and tegula black. Costa with weak spinules, without costal spine. Cross-vein r-m below the point where subcosta enters costa. Cross-vein dm-cu oblique, sinuous. Calypters and margins yellow. Knob of haltere black.

Abdomen: Conical, ground-colour black. Densely yellow-grey dusted with a black median line that becomes narrower towards the tip of abdomen. Sternite 1 bare. Sternite 5 ( Fig. 1 F).

Terminalia : Figs 1 C–E.

FEMALE: Length of body, 5.0– 6.2 mm. Length of wing, 4.0– 5.2 mm.

Differs from the male as follows:

Head: Dichoptic. Frons at middle 0.42 of head-width at this point, and at this point each fronto-orbital plate 0.3 of frontal vitta. Head grey dusted, frontal vitta brown dusted. Frontal triangle inconspicuous, hardly reaching the crossed setae on frontal vitta. Ocellar setae strong. 5–6 pairs of inclinate frontal setae, including several interstitials; 3 pairs of orbital setae, the upper two pairs reclinate and exclinate, the lower pair proclinate and exclinate. Frontal vitta with a pair of strong crossed setae.

Thorax: Scutum with whitish-grey dust, viewed from in front with brown diffused marks along the postsutural dorsocentrals and between them; postpronotal lobe, notopleuron and postalar lobe grey dusted (sometimes scutum and pleura wholly brown dusted). Acrostichals 2(3)+2, strong, long, often in uneven rows. Prealar absent or very short and weak. Scutellum whitish-grey dust with brown lateral marks.

Legs: Mid femur with 1–2 strong anteroventrals and with 2 long hair-like setae at base. Hind femur with a row of strong anteroventral setae, long on apical half and short on basal half, with weak posteroventrals on basal half. Hind tibia with 2–3 posterodorsals, 2–3 anterodorsals, 3 anteroventrals.

Wing: Yellowish, lighter at base.

Abdomen: Densely yellow-grey dusted with an indistinct dark median line.

Ovipositor: Figs 1 G, H.

Remark. Females are abundant sweat flies.

Distribution. Russia: Altai Mts, Khakasiya, Tyva, Buryatia, Zabaykalsky Krai, Sakha (Yakutia).

Figures

FIGURE 1. Drymeia acrostichalis (paratypes). A. Male habitus, lateral view. B. Male abdomen, dorsal view. C – E. Male terminalia. C. Lateral view. D. Postero-lateral view. E. Posterior view. F. Sternite 5. G, H. Female, apical portion of ovipositor. G. Dorsal view. H. Ventral view.