Boreantrops boliviensis, 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 : 336-337

Boreantrops boliviensis sp. nov.

( Figs. 27 , 81 , 122)

Diagnosis. Separable from other members of the emarginatus group by the following characters: Occiput black, prementum dark brown. Anterior margin of anepisternum shiny below spiracle. Fore leg with distal three tarsomeres brown. Mid tibia with row of anterodorsal bristles. Hind tibia without anteroventral bristle, with one ventroapical bristle. Wing without white spots. Postgonite with triangular projection on posterior margin.

Description. Occiput black, posterior three-quarters of frons, gena, and prementum dark brown, antenna and anterior quarter of frons orange to dark brown, maxillary palp yellow. Face mostly orange to brown, lateral corners and sometimes middle stripe between lunule and U-shaped mark dark brown to black. Mostly covered with microtomentum, frons shiny medially, microtomentum on orbital plates reaching bases of interfrontal setae ( Fig. 27 ), face with microtomentum below lunule and in dense crescent below antenna. Ocellar bristles just anterior to median ocellus. Subvibrissal and anterior bristles 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. Halter white, brownish below knob.

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

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 with sides straight, slightly wider at apex, posterior margin shallowly notched, anterior apodeme about as long as external portion, not keeled. Epandrium fused between anal opening and cerci. Surstylus with both lateral margins rounded. Pregonite fused with postgonite. Postgonite with a posterior triangular flap, boundary between lobes indistinct, rounded anterior lobe overlapping with posterior, posterior lobe with serrated margin, truncate apically. Basiphallus expanded medially, without distinct epiphallus, preepiphallus short and transparent. Distiphallus with spinose dorsal tube not touching medial sclerite distally, with a single spike-like sclerite laterally, dorsal distal corner produced ( Fig. 81 ).

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, 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, anterior third slightly narrower, pinched, posterior two-thirds covered with microtomentum. Hypoproct with an anterior notch, posterior margin and medial band moderately sclerotized. Spermathecae very long, twisted, not invaginated, sclerotized duct about as long as bulb.

Type material. Holotype ♂: BOLIVIA: La Paz: Cumbre Alto Beni, 28 km E Caranavi, 15°40'31"S 67°29'21"W, ~ 1400 m, dung pans, 14 Apr 2001, S.A. Marshall, debu00189525 ( UASC). Paratypes: same data as holotype (3 ♂, DEBU, UASC); as above but cloud forest (1 ♂, DEBU); Chulumani, Apa Apa Reserve, 2000 m, 1 Apr 2001, S.A. Marshall (1 ♂, DEBU); as above but dung baits (5 ♀, DEBU, UASC); as above but pan traps, 1–3 Apr 2001 (7 ♀, DEBU, UASC); as above but sweeping, 1 Apr 2001 (1 ♀, DEBU); Coroico, 0.5 km SE, dung bait, 15 Apr 2001, S.A. Marshall (1 ♀, DEBU).

Distribution. Western Bolivia (Fig. 122). Elevations from 1400–2000 m.

Etymology. The species name refers to the occurrence of this species in Bolivia.

Figures

FIGURES 26 – 29. Boreantrops heads, dorsal (anterior at top). 26) B. inbio; 27) B. boliviensis; 28) B. challabamba; 29) B. emarginatus. Some setae omitted.

FIGURES 78 – 85. Boreantrops male terminalia. B. auranticeps: 78) phallus, postgonite, and phallapodeme, lateral view, 79) sternite 5, 80) right surstylus, interior view; B. boliviensis: 81) phallus, postgonite, and phallapodeme, lateral view; B. challabamba: 82) phallus, postgonite, and phallapodeme, lateral view, 83) right surstylus, interior view; B. emarginatus: 84) phallus, postgonite, and phallapodeme, lateral view, 85) sternite 5. prj: projection of the postgonite.