Boreantrops subemarginatus, Kits, Joel H. & Marshall, Stephen A., 2015

Kits, Joel H. & Marshall, Stephen A., 2015, A revision of Boreantrops Kits & Marshall (Diptera: Sphaeroceridae: Archiborborinae), Zootaxa 3915 (3), pp. 301-355 : 343-345

Boreantrops subemarginatus sp. nov.

( Figs. 8 , 13 , 93, 94, 95 , 128)

Diagnosis. Separable from other members of the emarginatus group by the following characters: Occiput black, prementum reddish brown. Frons shiny medially. Anterior margin of anepisternum shiny below spiracle. Fore leg with distal two or three tarsomeres brown; posterior face of fore femur shiny. Mid tibia with row of anterodorsal bristles. Hind tibia without anteroventral bristle, with two ventroapical bristles. Wing without white spots. Postgonite with hook-shaped projection on posterior margin.

Description. Occiput black ( Fig. 13 ), frons, gena, lateral corners of face, and prementum reddish brown, median part of face and antenna orange, maxillary palp yellow. Mostly covered with microtomentum, frons shiny medially, microtomentum on orbital plates reaching bases of interfrontal setae, face with microtomentum below lunule and in dense crescent below antenna. Ocellar bristles just anterior to median ocellus. Subvibrissal and anterior genal bristle about 0.5X length of vibrissa.

Thorax black, mostly covered with microtomentum. Proepisternum shiny, anepisternum mostly shiny with microtomentum covering dorsal margin and posterior quarter, katepisternum with a shiny spot behind fore coxa, meron shiny, metapleuron with a shiny spot in posteroventral corner ( Fig. 8 ). Halter white, brownish below knob.

Legs black, joints, trochanters, and tarsi yellow, distal 2 or 3 tarsomeres of fore and hind tarsi brown. Posterior face of fore femur shiny. Fore basotarsomere with a small spur in male. Mid tibia with row of anterodorsals, 1 anteroventral, 1 posteroventral, 5 subapical bristles. Hind tibia with 2 ventroapical bristles.

Wing brown, veins dark brown, crossveins r-m and dm-cu paler.

Abdomen with tergites and sternites weakly sclerotized. Syntergite 1+2 with posterolateral corners and a thin band between them strongly sclerotized, tergites 3–4 with a thin posterior band moderately sclerotized.

Male postabdomen: Sternite 5 longer than wide, sides parallel, with a shallow V-shaped notch apically, anterior apodeme about as long as external portion, tapered, with slightly raised dorsal keel ( Fig. 94 ). Epandrium extending medially above cerci but not fused in middle, anal opening keyhole shaped. Surstylus with distal portion about as broad as long, lateral margins rounded ( Fig. 95 ). Pregonite fused with postgonite. Postgonite with a hook-shaped posterior extension, lobes long, overlapping, both truncate. Basiphallus subtriangular, no distinct epiphallus, prepiphallus short, narrow. Distiphallus with a weakly curved, spinose dorsal tube, flanked by a single spike-like sclerite ( Fig. 93 ).

Female postabdomen: Tergites 6–7 and sternites 6–7 wider than long, sclerotized. Tergites with 3 posterior strips, sternites with 2 posterior strips. Tergite 8 nearly square, slightly narrower posteriorly, emarginated anteriorly, covered with microtomentum except anterior margin. Epiproct parallel-sided, with wide anterior arms, 2 pairs of setae, with microtomentum medially. Cerci long, narrow. Sclerites of sternite 8 subrectangular, reaching anterior corners of sternite 8 laterally, posterior two-thirds covered with microtomentum. Hypoproct with an anterior notch, posterior margin and medial band moderately sclerotized. Spermathecae sausage-shaped, about 6X longer than wide, with shallow apical invagination, sclerotized duct about two-thirds as long as bulb.

Type material. Holotype ♂: VENEZUELA: Mérida: Tabay, La Mucuy, Truchicola trail, 2300 m, cloud forest, FIT, 17 Jun–3 Jul 1989, S. & J. Peck, debu00152803 ( MIZA). Paratypes: same data as holotype (2 ♂, 1 ♀, DEBU); Los Chorros, 1–5 May 1987, S.A. Marshall (1 ♂, 6 ♀, DEBU, MIZA); as above but FIT, 23–30 Apr 1988 (2 ♂, DEBU, MIZA); Mucui, 10 km E Tabay, 2000 m, 28 Apr 1981, H. Townes (1 ♀, DEBU); Merida, Santa Rosa Trail, dung traps, 23–30 Apr 1988, S.A. Marshall (1 ♂, 2 ♀, DEBU). ECUADOR: Napo: Baeza, 5 Mar 1979, S.A. Marshall (2 ♀, DEBU, QCAZ); Baeza, 15 km NW, 2200 m, dung trap, 2–6 Mar 1976, S. Peck (1 ♂, 2 ♀, DEBU); Cosanga, 4.2 km S, pipeline trail, 2200 m, 7 Nov 1999, S.A. Marshall (1 ♂, DEBU); El Chaco, 4.8 km W, 1750 m, 7 Nov 1999, S.A. Marshall (2 ♂, DEBU, QCAZ); El Chaco, 5 km N, Malaise trap/wet net, 15 Feb 1983, M.J. Sharkey (1 ♂, DEBU); SierrAzul Lodge, 14 km W Cosanga, 2200 m, forest, sweeping, 5 Nov 1999, S.A. Marshall (1 ♂, DEBU); as above but no collection method, 8–11 May 2002 (1 ♀, DEBU).

Distribution. Western Venezuela to northern Ecuador (Fig. 128). Elevations from 1750–2300 m.

Etymology. The species name refers to the weakly notched male sternite 5; it is a declinable adjective.

Figures

FIGURES 5 – 8. Boreantrops specimens, head and thorax, lateral. 5) B. costaricensis; 6) B. peruvianus; 7) B. emarginatus; 8) B. subemarginatus.

FIGURES 9 – 14. Boreantrops specimens, head and thorax, dorsal. 9) B. albipes; 10) B. avignis; 11) B. hispidus; 12) B. inbio; 13) B. subemarginatus; 14) B. zacapa. ads: additional setulae.

FIGURES 93 – 97. Boreantrops male terminalia. B. subemarginatus: 93) phallus, postgonite, and phallapodeme, lateral view, 94) sternite 5, 95) right surstylus, interior view; B. talamanca: 96) phallus, postgonite, and phallapodeme, lateral view, 97) sternite 5.