Empis (Enoplempis) dolabraria Melander

Empis (Enoplempis) dolabraria Melander View in CoL

( Figs 257, 258 View FIGURES 257–261 , 264 View FIGURES 262–265 , 284 View FIGURES 284–285 )

Empis dolabraria Melander, 1902: 325 View in CoL . Type locality: California ( USA).

E. (Enoplempis) dolabraria View in CoL : Melander, 1928: 142 (assigned to subgenus Enoplempis ).

Empis dolabraria View in CoL : Melander, 1965: 459 (catalogue); Yang et al. (2007): 133 (catalogue).

Type material examined. LECTOTYPE (here designated in order to fix identity of the species) ♂, labelled: “Cal./ Baron [right hindleg glued to label]”; “ W.M. Wheeler / Collection,”; “ TYPE / No. A.M.N.H. [red label]”; “ Am. Mus . Nat. Hist./ Dept. Invert. Zool./ No. 971”; “ Empis / dolabraria”; “ LECTOTYPE / Empis dolabraria Melander / des. Sinclair, Brooks &/ Cumming 2025 [red label]” [dissected] ( AMNH).

Notes on type specimens. This species was described from one male and one female specimen, collected by Baron. The female syntype was not located.

Additional material examined. USA. California: Alameda County: Sunol Reg. Wilderness, along Indian Joe Ck [37°30ʹN 121°49ʹW], 29.iii.1979, DDW (13♂, 33♀, CAS) . Amador County: 4 mi. E Fiddletown [38°30′N 120°45′W], 12.iii.1970, E.E. Grissell, R. F. Denno, (1♀, UCDC) GoogleMaps ; same data except, 13.iii.1970, Ranunculus (8♂, 16♀, UCDC) GoogleMaps ; same data except, 1 mi. E, 23.iii.1965, JAP (1♂, 1♀, EMEC) GoogleMaps ; same data except, R. L. Langston (1♀, EMEC) GoogleMaps . Contra Costa County: 4 mi. N Orinda [37°52′N 122°10′W], Russell Property, 27.iii.1964, H. V. Daly (1♂, 2♀, EMEC) GoogleMaps . El Dorado County: Coloma [38°48′N 120°53′W], 4 mi. W, 21.iii.1962, Salix, JAP (1♂, EMEC) GoogleMaps ; Cool [38°53′N 121°1′W], 23.iii.1965, JAP (1♀, EMEC) GoogleMaps ; Placerville [38°43′N 120°47′W], 3 mi. N, 23.iii.1965, R. L. Langston (1♀, EMEC) GoogleMaps . Mariposa County : Miami Ranger Sta. [37°26′N 119°38′W], 24.v.1942, sweeping (1♀, EMEC) GoogleMaps . Solano County: 8 mi. W Winters [38°30′N 122°5′W], 14.iii.1964, E.J. Montgomery (1♂, UCDC) GoogleMaps . Tulare County: Ash Mtn, Kwh Power Station #3 [36°29′N, 118°50′W], 23.iii.1993, J.F. MacDonald, CNC1732703 View Materials (1♂, CNC) GoogleMaps ; Camp Wishon [36°11′N 118°39′W], 12 mi. NE Springville, 1.v.1979, J. T. Doyen (1♂, EMEC) GoogleMaps . Tuolumne County: 1 mi. NW Soulsbyville [37°59′N 120°15′W], 1.v.1961, JAP (1♀, EMEC) GoogleMaps ; 3 mi. E Hardin Flat [37°48′N 119°56′W], 12.vi.1964, A. Gillogly (1♂, UCRC) GoogleMaps .

Diagnosis. This species is distinguished from other species of the E. (En.) valentis species group by the occiput bearing several irregular rows of strong setae, usually four marginal scutellar setae, halter with dark knob, male hind femur with single inner medial knob, separate from anteroventral process ( Figs 257, 258 View FIGURES 257–261 ), and wing length less than 7 mm.

Redescription. Wing length 5.9–6.8 mm. Male. Similar to E. (En.) aeripes , except as follows: head with occiput bearing several irregular rows of strong setae, similar in size to ocellar setae. Postpedicel long and tapered, 3× longer than basal width; stylus slightly longer than basal width of postpedicel. Palpus orange brown.

Thorax with scutum with two pairs of broad, well-separated brownish vittae. Scutum with 1 long and 1 shorter posterior npl, with 1–3 shorter anterior npl. Scutellum usually with 2 pairs of long sctl, widely separated medially.

Hind femur with anteroventral process digitiform with tuft of black apical setae and numerous setae on stalk, without short basal lobe; single short knob-like lobe medial to digitiform anteroventral process; apex with preapical row of 3–5 flattened, black posterior setae; preapical anterior seta weakly differentiated ( Figs 257, 258 View FIGURES 257–261 ). Hind tibia straight at base, with broad, somewhat flattened anteroventral digitiform process on basal quarter, with appressed black setae on outer margin, reduced to stub-like setae apically; posteroventrally with similar broad, rounded process, not flattened dorsally, with crown of black apical setae, longer than setae on anteroventral process ( Figs 257, 258 View FIGURES 257–261 ).

Wing with R 5 ending anterior to wing tip. Halter with dark knob.

Abdomen without posterior margin of tergites glossy. Terminalia ( Fig. 264 View FIGURES 262–265 ): cercus without knob-like projection in apical cleft. Hypandrium not prolonged laterally.

Female. Similar to male, except as follows: hindleg without modified setae and processes; abdomen with posterior margins of tergite 5 and 6 glossy; tergites 7 and 8 entirely glossy; abdominal pleural membrane with darkened, expanded region.

Geographical distribution and seasonal occurrence ( Fig. 284 View FIGURES 284–285 ). Empis (En.) dolabraria is known only from central California. Adults have been collected from March to June.

Nuptial gift presentation. Form unknown.