Boreantrops, KITS & MARSHALL, 2013

KITS, JOEL H. & MARSHALL, STEPHEN A., 2013, <p class = " HeadingRunIn " align = " left "> <strong> Generic classification of the Archiborborinae (Diptera: Sphaeroceridae), with a revision of <em> Antrops </ em> Enderlein, <em> Coloantrops </ em> gen. nov., <em> Maculantrops </ em> gen. nov., <em> Photoantrops </ em> gen. nov., and <em> Poecilantrops </ em> gen. nov. </ strong> </ p>, Zootaxa 3704 (1), pp. 1-113 : 86-87

Boreantrops gen. nov.

( Figs. 4 , 20 )

Type species: Archiborborus mexicanus Steyskal , by present designation

Description. Head orange to black, microtomentum variable. Face evenly sclerotized, ventral margin straight, lunule small. Occiput narrow below occipital foramen. Clypeus narrow, slightly produced. Palpus with dark setae concentrated along lateral margin. Prementum well-developed, circular, about 0.5X height of head. Labellum with 12 pseudotrachea. Scape very short, with 1–2 dorsomedial setulae; pedicel subtriangular, medial bristles slightly longer than outer; first flagellomere round, slightly pointed dorsoapically; arista dorsolateral, preapical, 2- segmented, about as long as head width, short-plumose. Chaetotaxy: orbital bristles in two lateroclinate pairs; irregular orbital setulae along orbital plate; interfrontal setae in 4–6 medioclinate pairs; ocellar bristles lateroproclinate; irregular, very short ocellar setulae; inner vertical bristles inclinate; outer vertical bristles lateroreclinate; postocellar bristles as long or longer than ocellar bristles, slightly proclinate; postvertical bristles small, cruciate; setae on median occipital sclerite short, medioclinate; postocular setae in a complete row with an incomplete row of occipital setae behind; vibrissa strong, as long as head; 1 subvibrissal bristle; 1 upturned anterior genal bristle; genal setae in 2–3 rows.

Thorax mostly black, microtomentum variable between species. Chaetotaxy: postpronotum with a single bristle; notopleuron with two bristles, posterior slightly shorter than anterior; one presutural and one postsutural intra-alar bristle; one long postalar bristle at posterior corner of scutum and a shorter postalar between this and scutellum; three dorsocentral bristles (one presutural and two postsutural); acrostichal setae in about 6 irregular rows; scutellum with 2 pairs of scutellar bristles; proepisternum with several small setulae; katepisternum with a single large dorsal bristle and irregular setae ventrally.

Wing clear to pale brown, sometimes with pale spots. Vein M reaching wing margin, CuA 1 extending somewhat past crossvein dm-cu, not reaching wing margin, A 1 +CuA 2 nearly parallel with CuA 1, distal part not vascularised, not reaching wing margin. Calypter with a dense marginal patch of flattened setae.

Fore femur with dorsal and ventral rows of long, thin erect setae. Fore tibia with a preapical dorsal bristle. Mid femur with a row of anterior bristles. Mid tibia with chaetotaxy variable between species. Hind femur with several dorsal and ventral bristles near apex. Hind tibia with a long preapical dorsal bristle and 1–2 ventroapical bristles.

Abdominal tergites, or at least tergite 5, with reduced sclerotization ( Fig. 20 ). Sternites weakly sclerotized in female, weakly to heavily sclerotized in male. Pleural membrane with setae on segments 3–5, occasionally a few on segment 2.

Male postabdomen: Sternite 5 variable between species. Synsternite 6+7 asymmetrical, complex, a portion often detached and forming an accessory sclerite flanking distiphallus in genital pouch; dorsal corner fused to sternite 8. Sternite 8 broadly fused to epandrium along right side. Epandrium more or less symmetrical, with a cleft above anterior edge of surstylus. Cerci small and medially fused. Subepandrial sclerite X- or Y-shaped, articulated with cerci and surstyli. Surstylus usually paddle-shaped. Hypandrial arms weakly fused with ventral edge of epandrium; hypandrial apodeme well-developed, somewhat flattened, weakly fused with arms. Phallapodeme welldeveloped, curved and broadest distally. Postgonites long and bilobed apically, articulated with phallapodeme, hypandrium, and basiphallus. Pregonites tiny, more or less fused with postgonites. Ejaculatory apodeme small, often lost in dissections. Basiphallus usually with both epiphallus and preepiphallus. Distiphallus complex, structure variable between species.

Female postabdomen: Abdomen telescoping, usually retracted in preserved specimens. Tergites and sternites 6–7 usually weakly sclerotized, narrow. Tergite 8 heavily sclerotized, sternite 8 divided medially, heavily sclerotized. Epiproct and hypoproct moderately sclerotized. Cerci simple, not fused with epiproct or each other. Three spermathecae, one pair sharing a duct and the other on a separate duct.

Comments. In addition to the type species B. mexicanus , this genus also includes Boreantrops calceatus (Duda) , comb. nov., and a number of undescribed species, including all archiborborine species occurring in Central America. The genus can be distinguished from other Archiborborinae by the reduced sclerotization of tergite 5 in all species and further reduced sclerotization of the other tergites in most species ( Fig. 20 ). A revision of this genus is currently in preparation.

The genus name is derived from the Greek boreas (north) combined with the genus name Antrops , and refers to the more northern distribution of this genus relative to the rest of the subfamily. It is masculine in accordance with ICZN 30.1.4.3.

Figures

FIGURES 1–6. Archiborborine adults, live habitus photos: (1) Maculantrops hirtipes, Olmue, Chile; (2) Antrops femoralis, Olmue, Chile; (3) A. annulatus, Olmue, Chile; (4) Boreantrops undescribed species, Savegre Lodge, Costa Rica; (5) Antrops inca, Wayqecha, Peru; (6) Frutillaria abdita Kits & Marshall, Putú, Chile. Photos by SAM.

FIGURES 19–20. Archiborborine abdomens: (19) Poecilantrops dominicus; (20) Boreantrops undescribed species. mr, medial ridge on syntergite 1+2; t, tergite.