Boreantrops cryptopygium, 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 : 354-355

Boreantrops cryptopygium sp. nov.

( Figs. 23 , 100, 101, 102 , 132)

Diagnosis. Separable from other members of the genus by the following characters: Syntergite 1+2 completely strongly sclerotized. Male hypopygium withdrawn into segment 4 at rest.

Description. Head dark brown, face, anterior margin of frons, antenna, and clypeus orange, occiput black, prementum and maxillary palp yellow. Mostly covered with microtomentum, frons shiny except orbital plates and patch from base of postverticals anteriorly through middle of ocellar triangle to around bases of preocellars, face shiny on ventral third. Ocellar bristles just anterior to median ocellus. Anterior genal and one or two subvibrissal bristles enlarged, about 0.3X length of vibrissa.

Thorax black, mostly covered with microtomentum, anepisternum with a ventromedial shiny patch about twothirds height of sclerite, katepisternum with a shiny patch behind fore coxa, metapleuron shiny with a stripe of microtomentum between posterior spiracle and hind coxa. Acrostichal bristles in 4 rows. Halter whitish.

Legs black, joints orange, coxae dark brown, trochanters yellow. Fore tarsus with basal 2 tarsomeres dark brown, distal tarsomere yellow, tarsomeres 3–4 intermediately coloured. Mid and hind tarsi yellow, distal tarsomere palest. Mid tibia 2 with 1 anterodorsal, 1 anteroventral, 1 posteroventral, 5 subapical bristles. Hind tibia with one ventroapical bristle.

Wing light brown, slightly lighter around crossveins r-m and dm-cu, vein R4+5 with 2 white spots distal to crossvein r-m.

Abdomen with tergites 1–4 black, heavily sclerotized, covered with microtomentum. Tergite 5 weakly sclerotized in females, weakly sclerotized medially in males ( Fig. 23 ). Sternites black, heavily sclerotized, covered with microtomentum in males, weakly sclerotized in females.

Male postabdomen: Sternite 5 narrowed before apex, posterior margin straight with complete row of setae, posterolateral corners separated from central portion by unsclerotized articulation, with a very long anterior apodeme reaching level of sternite 2, apodeme without a keel ( Fig. 102 ). The apparent resting state of the genitalia is with the hypopygium withdrawn inside segment 4 while the posterolateral corners of sternite 5 are folded dorsally over the central portion of the sternite. Surstylus subrectangular, scooped, medial margin notched near the apex ( Fig. 101 ). Postgonite with anterior and posterior lobes of similar size, widely separated, anterior lobe round, posterior lobe pointed apically. Basiphallus L-shaped, with several short projections but no distinct epiphallus or preepiphallus. Distiphallus with a short spinose dorsal tube and a patch of hair-like structure on barely sclerotized ventral sclerites ( Fig. 100 ).

Female postabdomen: Tergites 6–7 square, margins weakly sclerotized, center not sclerotized, with 3 weakly sclerotized posterior strips. Tergite 8 square, moderately sclerotized, covered with microtomentum. Epiproct parallel-sided with long diverging anterior arms, pointed apically, with 2 setae, covered with microtomentum except on arms. Cerci long and thin, covered with microtomentum. Sternites 6–7 slightly longer than wide, margins weakly sclerotized, center not sclerotized, with 2 weakly sclerotized posterior strips. Sclerites of sternite 8 weakly sclerotized with posteromedial corners strongly sclerotized, slightly broader apically, covered with microtomentum. Hypoproct trapezoidal, covered with microtomentum. Spermathecae ovoid, about 1.5X longer than wide, annulated, with sclerotized duct about as long as bulb.

Type material. Holotype ♂: BOLIVIA: La Paz: Chulumani, Apa Apa Reserve, 16°21'15"S 67°30'21"W, 2000 m, pan traps, 1–3 Apr 2001, S.A. Marshall, debu00208840 ( UASC). Paratypes: same data as holotype (3 ♂, 3 ♀, DEBU, UASC); as above but hand collected, 1 Apr 2001, S.A. Marshall (1 ♀, DEBU); as above but dung baits (2 ♂, DEBU, UASC); as above but sweeping, 1 Apr 2001, S.A. Marshall (1 ♀, DEBU); Apa Apa, 8 km S Chulumani, 1950–2100 m, Malaise trap, 23 Mar 2001, S.D. Gaimari (1 ♀, USNM); Caranavi, ca. 10 km NW, road to ENTEL tower, 1400 m, dung pans, 13 Apr 2001, S.A. Marshall (2 ♀, DEBU); Coroico, Cerro Uchumachi, 2550 m, elfin forest, dung pans, 5–16 Apr 2001, S.A. Marshall (1 ♂, 1 ♀, DEBU); as above but 5–6 Apr 2001 (1 ♂, DEBU); Cochabamba: Río Vinto, 80 km E Cochabamba, 2300 m, mixed alder litter, 3 Feb 1999, R. Anderson (1 ♂, DEBU); Sehuencas, 16 km N Monte Puncu, 2219 m, chaco, bait trap (squid carrion), 18 Nov 1993, Parrillo & Rojas (4 ♂, 3 ♀, FMNH); Serranía de Siberia, Chua Khocha, 2360 m, cloud forest, window trap, 26 Aug–6 Sep 1990, P. Parrillo (2 ♂, 2 ♀, FMNH); along Hwy. 7, 1651 m, road cut into forest, bait trap (squid carrion), 19 Nov 1993, Parrillo & Rojas (12 ♂, 7 ♀, FMNH); Santa Cruz: Yungas de la Mairana, 2300 m, Yungas, litter, 29 Jan 1999, R. Anderson (1 ♀, DEBU).

Distribution. Across the Bolivian yungas (Fig. 132). Elevations from 1400–2550 m.

Etymology. The species name is from the Greek kryptos (hidden) + pygium (buttocks), referring to the retracted hypopygium of the males.

Figures

FIGURES 21 – 23. Boreantrops specimens, abdomen dorsal. 21) B. inbio; 22) B. emarginatus; 23) B. cryptopygium. t 1 – 5: tergites 1 to 5.

FIGURES 98 – 102. Boreantrops male terminalia. B. wayqecha: 98) phallus, postgonite, and phallapodeme, lateral view; B. zamora: 99) phallus, postgonite, and phallapodeme, lateral view; B. cryptopygium: 100) phallus, postgonite, and phallapodeme, lateral view, 101) right surstylus, interior view, 102) sternite 5.