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

Empis (Enoplempis) oregonensis sp. nov.

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( Figs 331 View FIGURES 331–335 , 338, 339 View FIGURES 338–341 , 353 View FIGURES 353–354 )

Type material. HOLOTYPE ♂ ( Fig. 331 View FIGURES 331–335 ), labelled: “USA: OR: Curry Co. Rouge R.,/ Siskiyou NF, Rd 1909 mi. 15.1@/ unmarked trailhead, 42.196197 / -123.992731, dry burned-over/ woods, 25.v.2014, S. Fitzgerald ”; “ CNC/ 1078377 View Materials ”; “ HOLOTYPE / Empis (Enoplempis) / oregonensis Sinclair ,/ Brooks & Cumming [red label]” ( CNC) GoogleMaps . PARATYPES: USA. Oregon: Benton County: Rock Ck at end of Woods Ck Rd , 44°31′51.9″N 123°32′39.5″W, 546 m, 6.vii.2014, SJF (2♂, 1♀, CNC) GoogleMaps . Curry County: Same data as holotype (2♂, 1♀, CNC) GoogleMaps . Tillamook County: Boyer [45.0713°N 123.7277°W], 21.vi.1934 (2♀, AMNH) GoogleMaps ; same data except, 21.vii.1935 (2♂, 1♀, AMNH) GoogleMaps ; same data except, 28.vii.1935 (1♂, AMNH) GoogleMaps ; same data except, 1.viii.1935 (1♂, AMNH) GoogleMaps ; same data except, 2.vii.1937 (2♀, AMNH) GoogleMaps ; same data except, 13.vii.1937 (1♀, AMNH) GoogleMaps ; same data except, 24.vi.1938 (1♀, AMNH) GoogleMaps .

Diagnosis. This species is distinguished from other species of the subgenus by the grey body ( Fig. 331 View FIGURES 331–335 ) and males are holoptic, with unmodified hindleg, swollen hind tarsomere 1, hind tibia with long, dorsal setae, cercus with straight dorsal margin, tapered on posterior third and phallus with preapical dorsal expansion and roughened apex ( Fig. 339 View FIGURES 338–341 ).

Description. Wing length 5.1–6.0 mm. Male. Similar to E. (En.) californica sp. nov., except as follows: head holoptic, eyes meeting on frons. Postpedicel long and tapered, 4× longer than basal width.

Thorax with antepronotum with 2–4 pairs of dark setae. Scutum with 2 posterior npl, with 1–2 short anterior npl setulae.

Legs short, slender, orange brown, apical half of tibiae and tarsi darker brown; coxae without dense greyish pruinescence ( Fig.331 View FIGURES 331–335 ).Mid and hind femora with white ventral pile.Fore femur with anteroventral and posteroventral row of setae, shorter than half width of femur. Fore tibia with 2–4 erect anterodorsal and posterodorsal setae, longer than width of tibia; anterior face with short appressed setae. Fore tarsomere 1 swollen with several long dorsal setae, length longer than width of tarsomere, with fine dense ventral setae; tarsomeres 2–5 with biserial row of spine-like ventral setae; tarsomeres 1–4 with apicolateral pair of spine-like setae, longer than width of segment. Mid femur similar to fore femur. Mid tibia with 3–5 long posterodorsal setae; 3–4 long, strong anteroventral and posteroventral setae about as long as width of tibia. Mid 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. Hind femur slender without modified setae and processes; rows of fine ventral setae, shorter than width of femur; strong anteroventral seta on apical fifth ( Fig. 331 View FIGURES 331–335 ). Hind tibia without processes or modified setae; long dorsal setae, length nearly twice width of tibia; without long anterior or ventral setae ( Fig. 331 View FIGURES 331–335 ). Hind tarsus swollen with several long dorsal setae, similar to tibia; otherwise tarsomeres 1–5 similar to mid tarsus.

Wing with CuA+CuP weakened and fading out before wing margin; remaining veins complete (except Sc). Halter pale, yellowish white to orange brown ( Fig. 331 View FIGURES 331–335 ).

Abdomen with dense whitish pruinescence when viewed from different angles; sclerites of segment 8 fused anterolaterally. Terminalia ( Figs 338, 339 View FIGURES 338–341 ): epandrium and cerci dark brown, with phallus orange brown and shiny. Cercus with straight dorsal margin, with tapered posterior third; setae nearly as long as width of cercus. Subepandrial process extending on either side of phallus. Epandrial lamella elongate and narrow, longer than height; posterior margin upcurved, rounded, bearing long setae ventrally, length nearly as long as width of epandrium. Hypandrium narrow, strap-like; without setae. Phallus ( Fig. 339 View FIGURES 338–341 ) with basal third expanded, tapered apically, gradually curved, apex emerging beyond cerci; apex with subapical dorsal expansion, with roughened apical surface; ejaculatory apodeme more than half-length of epandrium, Y-shaped, with lateral apodemes positioned near ventral margin with short medial apodeme.

Female. Similar to male, except as follows: frons broader, wider than anterior ocellus; legs stockier, without modified setae and processes; coxae often with bluish pruinescence.Abdominal pleural membrane without darkened, expanded region; tergite 8 and syntergite 9+10 with pruinescence.

Geographical distribution and seasonal occurrence ( Fig. 353 View FIGURES 353–354 ). Empis (En.) oregonensis sp. nov. is known from the Coast Range in Oregon. Adults have been collected from May to August.

Etymology. This species is named after Oregon, the state in which all the type specimens were collected.

Nuptial gift presentation. Form unknown.