Antrops chaetosus (Richards) 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 : 25

publication ID 10.11646/zootaxa.3704.1.1

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Antrops chaetosus (Richards)

comb. nov.

Antrops chaetosus (Richards) , comb. nov.

( Figs. 31, 32, 35 View FIGURES 31–37 , 200 View FIGURES 195–203 )

Archiborborus (Procopromyza) chaetosus Richards 1961: 60 View in CoL

Description. Occiput reddish brown, face and gena yellow, frons intermediately coloured. Clypeus, prementum, and maxillary palp yellow, antenna yellowish brown. Covered with microtomentum except shiny spots lateral to ocellar triangle. Distance from ocellar bristles to medial ocellus equal to distance between ocelli, ocellar bristles reclinate-divergent. Anterior genal bristle about 0.6X length of vibrissae.

Thorax orange to reddish brown, entirely covered with microtomentum. Halter absent.

Legs yellow, tibia 1, medial part of tibia 2, basal three-quarters of tibia 3, and basal two-thirds of femora 2 and 3 brown. Tibia 2 with row of anterodorsal, 1 anteroventral, 1 posteroventral, about 3 subapical bristles.

Wing reduced, straplike. Only veins R 1 and R 2+3 apparently remaining. Membrane and veins brown.

Abdomen with tergites and sternites dark brown and heavily sclerotized in both sexes, covered with microtomentum. Tergites 2–4 with a row of greatly enlarged subapical bristles.

Male postabdomen: Sternite 5 broad, posterior margin shallowly emarginated, anterior apodeme about as long, two-thirds width of external portion ( Fig. 35 View FIGURES 31–37 ). Surstylus with distal portion narrow, pointed ( Fig. 32 View FIGURES 31–37 ). Pregonite distinct, relatively large. Postgonite strongly curved, lobes well separated, anterior lobe broad, with truncate tip covered with microtrichiae, posterior lobe short, truncate. Basiphallus with short epiphallus, preepiphallus strongly curved, broad apically. Distiphallus with short, smooth dorsal tube, ventrally with a dorsally curved distal sclerite ( Fig. 31 View FIGURES 31–37 ).

Female postabdomen: Tergites 6–7 and sternites 6–7 broad, moderately sclerotized, posterior half covered with microtomentum. Tergites with 3 posterior strips, sternites with 2 posterior strips. Tergite 8 trapezoidal, anterior margin emarginated, posterior half covered with microtomentum. Epiproct with short anterior arms, shiny, with 1 pair of setae. Cerci broad. Sclerites of sternite 8 broad, subrectangular, distal third covered with microtomentum. Hypoproct subrectangular, with a heavily sclerotized inverted triangle medially covered with microtomentum. Spermathecae (1+3) sausage-shaped, about 3X longer than wide, annulated, with a shallow apical invagination, sclerotized duct short. Dissected female with 7 eggs.

Type material. Holotype ♂: CHILE: [Los Lagos:] Chiloe I., 42° S, Chepu, 2 Oct 1958, G. Kuschel ( MNNC; not examined) . Paratypes: same data as holotype (1 ♀, BMNH) ; same data as holotype but dates 3–13 Oct 1958 (3 ♀, BMNH) .

Other material examined. CHILE: Araucanía: Chacamo, NW Nueva Imperial, 600–700 m, 17–23 Feb 1981, L. Peña (1 ♂, USNM) ; P.N. Ñielol, Temuco , 38°43'S 72°35'W, 250 m, native forest remnants with Nothofagus, FMHD #82–824, dung trap (human), 14–30 Dec 1982, Newton & Thayer (1 ♀, FMNH) GoogleMaps ; Purén, Contulmo Nat. Mon. , 350 m, evergreen forest, rotten mushroom, 11 Nov 1984, S. & J. Peck (1 ♂, DEBU) ; as above but mixed forest litter, FMHD#85–1001, Berlese , 13 Feb 1985 (1 ♀, FMNH) ; Los Lagos: 3 km S Maicolpue, Bahía Mansa, 200m, mixed forest, FMHD#85–933, Berlese , litter, 21 Dec 1984, S. & J. Peck (1 ♀, FMNH) ; Los Ríos: Valdivia, 30 km W La Unión, Las Trancas , 500 m, Nothofagus , 7–11 Feb 1988, L. Masner (1 ♂, 1 ♀, CNCI) .

Comments. Richards reported that the holotype of this species was deposited in the University of Chile collection. Subsequent efforts to locate Richards' types in that collection were unsuccessful ( Pitkin 1989, Kits and Marshall 2011) and the specimens were considered lost. However, after the publication of our paper on Frutillaria ( Kits and Marshall 2011) , Mario Elgueta informed us (pers. comm.) that the holotypes of F. stenoptera Richards , F. calceata Richards , F. edenensis Richards , and A. chaetosus are all present in the MNNC collection, although unfortunately in poor condition.

This species is readily separated from its congeners by the wing shape and bristles on the abdomen. Although we were unable to examine the holotype, Richards' description is complete and the species is distinctive.


Museo Nacional de Historia Natural, Santiago


Smithsonian Institution, National Museum of Natural History


Field Museum of Natural History


Ontario Insect Collection, University of Guelph


Canadian National Collection Insects














Antrops chaetosus (Richards)


Archiborborus (Procopromyza) chaetosus

Richards, O. W. 1961: 60
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