Boreantrops peruvianus, 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 : 329-330

Boreantrops peruvianus sp. nov.

( Figs. 6 , 59, 60 , 117 )

Diagnosis. Separable from other members of the avignis subgroup by the following combination of characters: Occiput brown with a yellowish orange semicircle behind gena. Mesoscutum mostly shiny, scutellum shiny laterally with a medial stripe of microtomentum. Katepisternum mostly shiny. Tarsi with distal two tarsomeres brown.

Description. Head yellow to orange, occiput mostly brown with yellowish orange semicircle behind gena ( Fig. 6 ). Microtomentum on frons at anterior corners and around base of postvertical bristles, along ventral margin of gena, thin band on face below lunule and antenna, on prementum, and on occiput. Ocellar bristles just anterior to median ocellus. Subvibrissal bristle and anterior genal bristle about 0.5X length of vibrissa.

Thorax black, mostly shiny with scattered microtomentum on mesoscutum in acrostichal area, on scutellum in a medial stripe and along lateral margins, on anepisternum along posterior third except ventral corner, on katepisternum outlining a shiny patch behind fore coxa and ventrally, on anepimeron and laterotergite, and metapleuron ( Fig. 6 ). Mesoscutum sculptured. Scutellum subtriangular, dorsal surface concave medially. Halter whitish.

Legs black, trochanters yellow, joints paler. Tarsi with 3 basal tarsomeres ivory white, distal 2 brown. Mid tibia with one preapical anterodorsal, 4 subapical bristles. Hind tibia with one ventroapical bristle.

Wing clear, veins yellow to light brown.

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. Pleural setae on small discs, about the diameter of spiracles.

Male postabdomen: Sternite 5 narrow, posterior corners strongly flared, posterior margin notched medially with interrupted row of setae, anterior apodeme about half as long as external portion ( Fig. 60 ). Surstylus long, paddle-shaped. Hypandrial arms with ventral tab-like structures. Pregonite fused with postgonite. Postgonite with lobes not separated, anterior lobe truncate, posterior lobe pointed. Basiphallus with long epiphallus, thin, transparent preepiphallus. Distiphallus with curved spinose dorsal tube, distal tip slightly recurved ( Fig. 59 ).

Female postabdomen: Tergites 6–7 and sternites 6–7 very broad, somewhat narrower anteriorly, moderately sclerotized. Tergites with 3 posterior strips, sternites with 2 posterior strips. Tergite 8 very broad, trapezoidal, shallowly emarginated anteriorly, covered with microtomentum except anterior margin and corners. Epiproct with very short anterior arms, with microtomentum medially, 1 pair of setae. Cerci broad. Sclerites of sternite 8 very broad, somewhat narrower anteriorly, posterior two-thirds covered with microtomentum. Hypoproct broad, notched anteriorly. Spermathecae barrel-shaped, about 1.5X longer than wide, invaginated apically, sclerotized duct short.

Type material. Holotype ♂: PERU: Loreto: Teniente López, FIT, 23 Jul 1993, R. Leschen, debu01039263 ( DEBU). Paratypes: Cusco: Paucartambo, Puente San Pedro, 50 km NW Pilcopata, 1600 m, 3 Sep 1988, A. Friedberg (2 ♀, USNM); Madre de Dios: Manu, Río Manu, Pakitza, 250 m, 9–23 Sep 1988, A. Friedberg (1 ♀, USNM); Manú Natl. Pk., Cocha Cashu Biol. Stn., 380 m, Malaise trap, coarse mesh, 8–12 Oct 1986, K. Petren (1 ♀, ROME); Zona Reserva Manu, Pakitza, 400 m, Malaise trap, 23–28 Feb 1992, B. Brown & D. Feener (1 ♀, DEBU).

Distribution. Eastern Peru ( Fig. 117 ), 250-1600 m.

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

Comments. This is the only species of archiborborine currently known from the Amazonian lowlands. One dissected female paratype contained 3 very large eggs, each about two-thirds the length of the abdomen.

Figures

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

FIGURES 55 – 60. Boreantrops male terminalia. B. masneri: 55) phallus, postgonite, and phallapodeme, lateral view, 56) sternite 5; B. oaxacensis: 57) phallus, postgonite, and phallapodeme, lateral view, 58) sternite 5; B. peruvianus: 59) phallus, postgonite, and phallapodeme, lateral view, 60) sternite 5.

FIGURES 115 – 120. Boreantrops distribution maps. 115) B. masneri (diamonds), B. calceatus (circle); 116) B. oaxacensis; 117) B. peruvianus; 118) B. subfoveolatus; 119) B. suchixtepecensis; 120) B. zacapa. Elevation is indicated by grey shading at 500 m intervals.