Revision of the western Nearctic species of Empis subgenus Enoplempis (Diptera: Empididae) Sinclair, Bradley J. Brooks, Scott E. Cumming, Jeffrey M. Zootaxa 2025 2025-03-31 5615 1 1 200 Sinclair & Brooks & Cumming 2025 [151,517,1776,1803] Insecta Empididae Empis Animalia Diptera 192 193 Arthropoda species deceptiva sp. nov. Enoplempis  ( Figs 355–357, 359–361, 367, 368, 370)   Type material.   HOLOTYPE ♂( Fig. 355), labelled: “CAN: QC: Terrasse Vaudreuil/ Molson Nature Reserve[ 45°23′41′′N 73°58′32′′W]/ Malaise,  16–25.vi.1999, S.E. Brooks”; “ CNC1078534”; “E. ( Enoplempis)/ tridentata Coquillett/ det. Sinclair et al.2013”; “ HOLOTYPE/  Empis( Enoplempis)/  deceptivaSinclair,/ Brooks & Cumming [red label]” ( CNC).   PARATYPES: CANADA. Ontario: Nepean, 24 Gervin St, 45.317°N 75.720°W,  2.vii.2020,  90 m, MT, J.E. O’Hara( 1♂, CNC).   Quebec: Cté Vaudreuil, summit Mt. Rigaud[ 45.466°N 74.326°W],  16.vii.1993, D.M. Wood( 1♀, CNC).   USA. Massachusetts:  Middlesex County: Melrose Highlands[ 42°28′07″N 71°04′11″W],  1.vii.1911, J.D. Tothill( 1♂, CNC).   New Hampshire:  Strafford County: Durham[ 43°08′N 70°55′W],  1.vii.1981, K. Tacewski( 1♀, CNC).   Hillsborough County: Nashua, Long Hill,  20 m, N 42°42′59″ W71°27′04″,  27.vi–5.vii.2004, MT, S.D. & A. V.  Gaimari( 7♂, 6♀, CNC).   Diagnosis.This species is included in the  E.( En.) tridentataspecies group on the basis of three distinct scutal vittae, wings with clouding at base of R 4and apex of the discal cell and robust ventral setae on the hind femur. Males of this new species are distinguished from  E.( En.) tridentataby the more widely separated eyes ( Fig. 357vs Fig. 358), less tapered cercus and evenly arched phallus. Females are distinguished by the absence of short pennate scales on the mid and hind femora ( Figs 359, 360vs Figs 362, 363) and absence of a stub vein near the base of R 4( Fig. 361vs Fig. 364).   Description.Wing length 5.1–6.0 mm. Male.Similar to  E.( En.) tridentataexcept as follows: head with eyes separated on frons by width of anterior ocellus ( Fig. 357). Terminalia ( Figs 367, 368): cercus yellow, epandrium darker. Cercus short, broad, separate from anterior margin of epandrium, broader at anterior end; posterior end slightly narrower than anterior end, apex tapered; clothed in setae, longer apically. Subepandrial process slender, straight, extending to either side of phallus. Epandrial lamella subquadrate, posterior margin somewhat truncate, bearing short apical setae. Hypandrium very reduced, with truncate apical margin, about 0.5× as long as epandrium; lacking setae. Phallus with broad base, tapered, apically smoothly curved, not sinuous; apex emerging beyond cercus; ejaculatory apodeme shorter than epandrium; inverted Y-shaped, with short median keel.  Female.Similar to male, except as follows: frons broader, about twice width of anterior ocellus; spine-like setae of mid femur less numerous and slightly less stout; pennate scales on mid and hind femora absent ( Figs 359, 360); base of R 4without short stub vein ( Fig. 361); cercus long and slender, slightly shorter than tergite 8.  Geographical distribution and seasonal occurrence( Fig. 370).  Empis( En.) deceptiva  sp. nov.is known from Ontario and Quebec and the New Englandstates of New Hampshireand Massachusetts. Adults have been collected in June and July.   Etymology.The species name is from the Latin decipio, in reference to this species being overlooked among the specimens of  E. ( En.) tridentata.  Nuptial gift presentation.Form unknown.   Remarks.This species was found hidden among identified specimens of  E. ( En.) tridentata. While re-examining the legs of  E. ( En.) tridentata, it was discovered that northern specimens lacked rows of small pennate scales on the female mid and hind femora ( Figs 359, 360), base of R 4without short stub vein ( Fig. 361) and the male eyes were significantly more widely separated ( Fig. 357) compared to the lectotypeof  E. ( En.) tridentata( Pennsylvania) and more southern specimens ( Fig. 358). In addition, small differences in the male terminalia were discovered which supported the recognition of a new species despite the shared distinctive body colour pattern and wing clouding. These two species are assigned to the newly recognized  E. ( En.) tridentataspecies group based on the characters listed in the above diagnosis. 1999-06-16 1999-06-25 1999-06-16 QC, CNC S. E. Brooks Malaise Sinclair 193 194 45.394726 Terrasse Vaudreuil 19 -73.975555 Molson Nature Reserve 192 193 CNC1078534 1 1 holotype 2020-07-02 MT Canada 90 45.317 Gervin St 67 -75.72 Nepean 193 194 1 Ontario paratype [273,538,187,213] CNC O'Hara Canada 193 194 1 1 Ontario paratype 1993-07-16 CNC D. M. Wood Canada 45.466 Mt. Rigaud 67 -74.326 Cte Vaudreuil 193 194 1 1 Quebec paratype 1911-07-01 CNC J. D. Tothill United States of America Middlesex County 42.468613 Melrose Highlands 19 -71.06972 193 194 1 1 Massachusetts paratype 1981-07-01 CNC K. Tacewski United States of America Strafford County 43.133335 Durham 1145 -70.916664 193 194 1 1 New Hampshire paratype 2004-06-27 2004-07-05 2004-06-27 MT United States of America Hillsborough County 20 Long Hill -42.71639 Nashua 193 194 1 New Hampshire paratype [347,623,331,357] CNC United States of America Gaimari 193 194 13 6 7 New Hampshire paratype