Rhamphomyia albibasis, Frey, 1935: 1

Shamshev, Igor V., 2020, Notes on species of Empididae (Diptera) described by R. Frey from the Swedish Kamchatka Expedition 1920 - 1922, Zootaxa 4758 (3), pp. 532-548 : 543-545

albibasis Frey, 1935: 1 ( Rhamphomyia (Pararhamphomyia ))

Current name. Rhamphomyia (Pararhamphomyia) albibasis Frey, 1935 .

Type locality (by lectotype designation): Russia, Kamchatka.

Notes on the type series. Frey described this species after the female sex only. He noted the following material: “ 4 ♀, Kamtchatka (Malaise). Ausserdem 1 ♀ -Exemplar im Helsingforser Museum vom Jenissei: Kantaika (J. Sahl- berg), schon früher von Becker (Acta Soc. Scient Fenn., XXVI, S. 26, n: o 28, 1900) als Rhamphomyia sp. erwähnt”. Three females were found in NHRS .

Type materials examined. LECTOTYPE (here designated in order to fix identity of the species), ♀ ( Fig. 19 ), labelled ( Fig. 20 ): “ Kamtschatka / Malaise ”; “317”; “Spec. typ.”; “ Rhamphomyia / albibasis n. sp. [hand-written by Frey ]/ R. Frey det.”; “ Rhamphomyia / albibasis Frey [modern Museum label]”; “ Lectotypus ♀ / Rhamphomyia / albibasis Frey, 1935 / design. Shamshev, 2019” ( NHRS). The lectotype is in good condition but right postpedicel + stylus and right hind tarsomeres 2–5 missing.

PARALECTOTYPES: Kamtschatka, Malaise , Rhamphomyia albibasis Frey ; Paralectotypus, Rhamphomyia albibasis Frey, 1935 , design. Shamshev, 2019 (2 ♀, NHRS) .

Additional material examined. RUSSIA, Kamchatskiy Territory: Kamchatka, Elovka, 24.vi.1929, Novograblenov ; Rh. albibasis Frey, Frey det. (1 ♀, ZIN) .

Diagnosis. Small, blackish grey, black setose species with anal vein (CuA+CuP) incomplete and halter yellow; female wing somewhat broadened, bicoloured, legs with simple setae.

Re-description. Female ( Fig. 19 ). Lectotype body length 3.5 mm; wing length 3.6 mm. Head with dense greyish pruinescence on face, frons, ocellar tubercle and occiput. Eyes dichoptic, ommatidia equally small. Frons very broad, slightly widened toward ocellar tubercle; with short marginal setae. Face broad, bare. Ocellar tubercle with 2 stronger (both missing) and several short fine setae. Occiput with numerous black setae shorter and finer near mouth-opening on lower part. Antenna black; scape slightly longer than pedicel, both with short setae; postpedicel 2.5 times longer than basal width; stylus very short, nearly as long as half of postpedicel width. Palpus dark brown, with numerous black setae. Labrum brown, nearly as long as eye height.

Thorax dark, densely light grey pruinescent, with black setation; scutum with 2 indistinct darker vittae along dorsocentrals (dorsal view). Proepisternum with cluster of 6 setae on lower part; several similar setae on upper part of proepisternum in front of anterior spiracle. Prosternum bare. Antepronotum with 4–5 moderately long setae on each side. Postpronotal lobe with 1 long and 6–7 short setae. Mesonotum with well differentiated setae: 1 presutural supra-alar (with 3–4 short setae just behind postpronotal lobe), 1 postsutural supra-alar (with row of 4 short setae anteriorly); 4 notopleurals (and 3–4 short setae anteriorly) and 1 postalar (with 2 short setae), 5 scutellars (apical setae not much longer than laterals; in paralectotypes examined scutellar setae missing) [Frey notes 6 scutellars, 2 long and 4 short]; presutural dorsocentrals irregularly multiserial, short, 1–2 serial and longer along prescutellar depression toward scutellum, 2–3 prescutellars longest; acrostichals arranged in 2 irregular rows, similar to presutural dorsocentrals, lacking on prescutellar depression. Laterotergite with cluster of numerous setae. Anterior and posterior spiracles brown.

Legs dark brown, coxae densely greyish pruinescent, remaining podomeres faintly pruinescent. Coxae and trochanters with numerous black hair-like setae. Femora, tibiae and tarsi covered with black, simple, mostly short setae; hind tibia with some longer setae dorsally, 1 short seta in posteroapical comb.

Wing somewhat broadened, membrane largely faintly brownish infuscate, narrow basal part (nearly level of cell bm) somewhat whitish; pterostigma distinct; 1 basal costal seta present. Anal vein (CuA+CuP) incomplete. Axillary incision right-angled, anal lobe well-developed. Squama yellow, brown fringed. Halter yellow.

Abdomen dark, densely light grey pruinescent, covered with short black setae; cercus concolorous with abdomen, slender, with minute setulae.

Male. Unknown.

Distribution. Palaearctic: Russia (Krasnoyarskiy, Kamchatskiy Territories).

Remarks. Since the male of this species remains unknown it can not be assigned to any of Pararhamphomyia groups currently recognised in the Eastern Palaearctic ( Barták & Kubík 2009). Frey (1955a) placed R. albibasis to his “group II” and keyed accordingly.

Figures

FIGURES 19, 20. Rhamphomyia (Pararhamphomyia) albibasis Frey. 19. female habitus, lectotype, lateral view; 20. lectotype labels.