Empis (Enoplempis) missoula, Sinclair & Brooks & Cumming, 2025

Empis (Enoplempis) missoula sp. nov.

urn:lsid:zoobank.org:act:3F4926F0-AD4F-4F11-A245-356AE2B266CA

( Figs 321–323 View FIGURES 319–323 , 328 View FIGURES 326–328 , 330 View FIGURES 329–330 )

Type material. HOLOTYPE ♂, labelled: “USA: MT: Missoula Co. / Lolo NF; Gold Ck Rd ; 1680m / 47°03.338′N 113°44.776′W / 27.vi.2017; B.J. Sinclair / ex. roadside flowers”; “ CNC/ 1078383 View Materials ”; “ HOLOTYPE / Empis (Enoplempis) / missoula Sinclair ,/ Brooks & Cumming [red label]” ( CNC) GoogleMaps . PARATYPES: CANADA. British Columbia: Mt Thornhill nr Terrace [54°30′N 128°35′W], 29.vii.1960, 3000–4000 ft, W. R GoogleMaps . Richards (1♂, CNC); same data except, 26.vii.1960, CHM (1♂, CNC) GoogleMaps ; Vancouver Is., 2.3 km from Lk. Cowichan [48°49′N 124°03′W], 19–28.vii.1985, cold spring run beside S Shore Rd, MT, CH4575 GoogleMaps , I.M. Smith (1♂, CNC); Vancouver Is., Brooks Pen., The Throne, Mt. Doom , 50°10′N 127°46′W, 14.viii.1981, BCPM GoogleMaps Brooks Pen. Project, R . A. Cannings, S.G. Cannings (1♂, UBCZ) . USA. Alaska: Juneau Borough: Thane [58°15′N 134°19′W], 12.v.1952 (1♂, WSU) GoogleMaps . Montana: Glacier County: Glacier NP, Swiftcurrent Cpgd [48.7969°N 113.6721°W], J.G. Edwards (1♂, CAS). Missoula County : Same data as holotype (2♂, CNC) GoogleMaps . Oregon: Benton County: McDonald Forest nr Corvallis [44.6439°N 123.3384°W], 22.v.1969, E.M. Fisher (1♂, CSCA) GoogleMaps . Washington: Chelan County: Ida Creek Cpgd, 12 km W Leavenworth [47.6077°N 120.8476°W], 14.vi.2008, C. Borkent, CJB08-3 (1♂, LEM); Scotty Ck, 2520 ft, 47°24′5″N 120°39′20″W, 13.vi.2018, J.M. Cumming (1♂, CNC). Clallam County : Olympic NP, nr Hurricane Rdg. Ldg. [47.9735°N 123.4915°W], 4.viii.1972, Dry Ice MT, WJT GoogleMaps , W.B. Garnett (1♂, WSU); Olympic NP, meadow below Sunrise Ridge, Mt Angeles [47°59′N 123°28′W], 1550 m, 24.vii.1978, DDW (3♂, 3♀, CAS) GoogleMaps . Spokane County: Bald Knob Cpgd, Mt Spokane SP [47.9144°N 117.1111°W], 1500 m, 25.vi.1978, DDW (13♂, 2♀, CAS) GoogleMaps ; same data except, 4800–5200 ft, 9–10.vii.1975, WJT (6♂, 6♀, WSU) GoogleMaps ; same data except, 21–22.vii.1975 (1♂, WSU); same data except, 9–10.vii.1975, MT GoogleMaps with dry ice (43♂, 19♀, WSU); same data except, 21–22.vii.1975 (8♂, 9♀, WSU); same data except, 5200 ft, 6.vii.1976 (15♂, WSU); same data except, 28.vi.1977, MT (30♂, 20♀, WSU) GoogleMaps ; same data except, 4800–5200 ft, 6.vii.1978 (22♂, 11♀, WFBM); same data except, sweeping (7♂, 3♂, WSU); same data except, 6.vii.1978 (1♂, WSU); same data except, 25.vi.1978 (19♂, 6♀, WSU); same data except, 5500 ft, 10.vii.1984, MT (12♂, 3♀, WSU) GoogleMaps ; Mt Spokane, 5500 ft, 10.vii.1984, J. Jenkins (3♂, WSU); Mt Spokane SP, Burbling Ck on Day-Spokane Rd , 3750 ft, 26.vi.1978, sweeping, WJT (9♂, WSU) .

Diagnosis. This species is distinguished from other species of the subgenus by the male with narrowly dichoptic eyes, pair of paint brush-like processes on hind femur and tibia ( Figs 322, 323 View FIGURES 319–323 ), absence of row of strong posterior setae on hind femur ( Fig. 323 View FIGURES 319–323 ), and short, simple phallus ( Fig. 328 View FIGURES 326–328 ).

Description. Wing length 5.8–6.0 mm. Male. Head dark in ground-colour, with greyish pruinescence ( Fig. 321 View FIGURES 319–323 ). Eyes narrowly dichoptic; frons slightly narrower than width of anterior ocellus; often with short setulae along inner margin of eye. Face without setae; short, slightly divergent towards mouthparts, with oral margin dark and shiny. Ocellar triangle elevated, with thin greyish pruinescence, with pair of parallel ocellar setae, shorter than occipital setae and several pairs of short setulae. Occiput bearing single row of setae, slightly stronger than postocular setae; postocular setae shorter than occipital row; postocellar region without setae. Antenna dark brown; scape 2× longer than pedicel, with short, black setae; pedicel with ring of apical setae; postpedicel long, tapered, 5× longer than basal width; stylus 1.5× longer than basal width of postpedicel. Palpus pale orange-yellow, with dark setulae. Proboscis yellowish brown, length less than 2× head height; labellum with short, dark setae.

Thorax dark brown in ground-colour, densely grey pruinescent ( Fig. 321 View FIGURES 319–323 ), with 2 pairs of brown vittae; median narrower pair between acr and dc rows, ending at prescutellar depression; faint broader outer vittae extending to postalar ridge; apex of postpronotal lobe, postalar ridge and sometimes lower margin of notopleuron yellowish brown. Proepisternum with several pairs of short pale setae on lower section; upper proepisternum in front of spiracle without setae. Prosternum bare. Antepronotum with row of short setae. Postpronotum with 1 long seta and several short setae. Scutum with sparse uniserial row of acr; dc uniserial, longer and stronger than acr, increasing in size posteriorly; 2 posterior npl, with 1–2 slender anterior npl; 1 presut spal; 1 psut spal; 1 pal. Scutellum with pair of long apical sctl, with 1–2 pairs of outer, shorter marginal setae; disc bare. Laterotergite with linear patch of 5–10 long setae. Anterior and posterior spiracles pale.

Legs slender, yellow, with apex of tibiae and tarsi brown ( Fig. 321 View FIGURES 319–323 ). Coxae with strong dark setae. Hind trochanter with numerous dark setulae. Femora with white ventral pile and anteroventral and posteroventral row of short setulae. Fore tibia with 2–3 outstanding anterodorsal and posterodorsal setae; anterior face with short appressed setae; apex with circlet of preapical setae. Fore tarsomere 1 narrow; tarsomeres 1–5 with biserial row of spine-like ventral setae; tarsomeres 1–4 with apicolateral pair of spine-like setae, longer than width of segment. Mid tibia with 2–3 pairs of erect anterodorsal and posterodorsal setae and several preapical setae; ventral face with dense setulae, with several strong posteroventral setae. Mid tarsus similar to fore tarsus. Hind femur with pair of paint brush-like preapical ventral processes, posteroventral process broader and flatter than anteroventral process; several erect anterodorsal setae on apical fourth; preapex with row of long anteroventral and posteroventral setae; apex with circlet of preapical setae; without row of strong posterior preapical setae ( Figs 322, 323 View FIGURES 319–323 ). Hind tibia with base narrowed and long dorsal setae, length less than twice width of tibia, with shorter erect ventral setae; pair of paint brush-like processes opposite processes of femur, anteroventral process broader than posteroventral process, with medial setae of brushes longer than outer setae; row of strong, dark setae proximal to ventral processes; with seta in posteroapical comb ( Figs 321–323 View FIGURES 319–323 ). Hind tarsus with tarsomere 1 somewhat thickened, with long dorsal setae, similar to tibia; remaining tarsomeres similar to mid tarsus.

Wing infuscate with dark veins; all veins well sclerotized, except CuA+CuP rather weak apically, reaching wing margin as fold; remaining veins complete (except Sc). Basal costal seta absent. R 5 and M 1 divergent near wing margin; R 5 ending at or slightly beyond wing tip; radial fork acute. Halter pale, white to yellowish ( Fig. 321 View FIGURES 319–323 ).

Abdomen paler than thorax, yellowish to nearly white with whitish pruinescence ( Fig. 321 View FIGURES 319–323 ); posterior marginal setae dark and long. Pregenital segments unmodified, except sclerites of segment 8 narrowly fused anterolaterally. Terminalia ( Fig. 328 View FIGURES 326–328 ): darker than abdomen; phallus shiny, orange brown. Cercus long and linear, tapered to narrow apex, shorter than epandrium; setae shorter than width of cercus. Subepandrial process broad basally, abruptly narrowed and straight; extending to either side of phallus. Epandrial lamella linear, tapered to broadly rounded apex; weakly fused with cercus anteriorly; setae mostly short, several longer than width of epandrium. Hypandrium short, apical margin arched; several short setae medially. Phallus very narrow at base, broadly expanded near mid-length;

gradually tapered beyond mid-length; apical section straight, shortened, with apex wide with ring of spicules; apex not emerging beyond epandrium; ejaculatory apodeme half length of epandrium, T-shaped, with lateral apodemes near lower margin.

Female. Similar to male, except as follows: frons broader, wider than anterior ocellus; hindleg without modified setae and processes; abdomen brown; abdominal pleural membrane not visible; tergites 7 and 8 with pruinescence.

Geographical distribution and seasonal occurrence ( Fig. 330 View FIGURES 329–330 ). Empis (En.) missoula sp. nov. is known from southern Alaska, British Columbia, Montana, Washington and Oregon. Adults have been collected from May to August.

Etymology. The species name is in reference to the type locality, Missoula County, Montana and is a noun in apposition.

Nuptial gift presentation. Form unknown.

Remarks. This species is somewhat similar to species of the E. (En.) delumbis group on the basis of paint brush-like lobes on the hindleg but is excluded on the basis of the differences in the phallus.