Apiochaeta tincticornis ( Malloch, 1933 ) Lonsdale & Marshall, 2008

Lonsdale, Owen & Marshall, Stephen A., 2008, Revision of the temperate South American genus Apiochaeta Czerny, 1903, with synonymy of Alloclusia Hendel, 1917 (Diptera: Clusiidae), Zootaxa 1944 (1), pp. 1-33 : 23

Apiochaeta tincticornis ( Malloch, 1933) , comb. n.

Figs 15, 16 , 36

Alloclusia tincticornis Malloch, 1933: 238 .

Description

Male. Body length 3.0–5.3mm. Arista pubescent. Three fronto-orbital bristles. Two pairs of lateral scutellar bristles. Scutum yellow with one pair of thin brown stripes continuing onto lateral margins of scutellum. Laterotergites yellow with katatergite brown (at least in part). Pleuron yellow with brown subnotal stripe. Legs yellow. Head yellow with ocellar tubercle wide and circular, first flagellomere with dark stripe along dorsal margin, back of head with one pair of stripes radiating from foramen, frons sometimes with thin anterior stripe and face sometimes brown (paratype male). Abdomen brown with tergite 1 yellow. Wing clear.

Female. As described for male except pleural stripe sometimes absent and terminalia yellow.

Male terminalia ( Figs 15, 16 & 36 )

Annulus well developed with tergite 7 small and not strongly separated from sternite 8. Length of epandrium 7/10 height; width subequal to height. Surstylus without internal elaboration and deeply bifid; posterior process long, thin and weakly lobate posterobasally; anterior lobe short, wide and rounded; outer face bristled on posterior half. Hypandrium with ventral lobe thin and emarginate apically with one minute and two long distal bristles. Phallapodeme with head minute and anterior face doubly sinuate. Pregonite rectangular with four central bristles. Postgonite elongate and lobate with three distal bristles and numerous distal setulae. Distiphallus thin and unsclerotized medially, distal forks of equal length, basal half with minute spinulose patches, and lateral spinulose projection unbranched and without median lateral swelling.

Holotype: CHILE. Chiloé : Puntra [date unknown] (♂, BMNH) [not examined].

Allotype: CHILE. Llanquihue : Casa Pangue [date unknown] (♀, BMNH) [not examined].

Paratypes: CHILE. Chiloé: S Chile, Chiloé I., F.&M. Edwards, Puntra , 19.xii.1926 (♂, BMNH), S Chile , Llanquihue: F.&M. Edwards, Casa Pangue , 9–10.xii.1926 (♀, BMNH) .

Additional material examined: ARGENTINA. Neuquén: Lago Lacar Pucará , 650m, 26–27.xii.1981, Nielsen & Karsholy (♀, ZMUC) , Río Negro: S.C. de Bariloche Colonia Suiza, 8000m, 2.xii.1981, Neilsen & Karsholt (♀, ZMUC) . CHILE. Cautín: Carahue-Cautín, Monte Verde , 600m, 29.i–2.ii.1993, ex. yellow pan traps, L. Peña (♂, CNC) , Chiloé: Isla Chiloé, Ahoni Alto , ix.1998, L.E. Peña (10♂ 5♀, CMNH; 5♂ 2♀, DEBU) , Malleco: PN Nahuelbuta, 8–24.ii. 2005, 1168m, 37°49’30”S, 72°58’24”W, Malaise trap in meadow and Nothofagus, UCR AtoL (♀, CNC) , Ñuble: Chillan area, ‘ Shangri La’, Las Trancas, E. Recinto , 19– 22.i.1979, A. Kovacs (♂, AMNH) , Osorno: 10km E Puyehue , 26.i.1951, Ross & Michelbacher (♀, CASC) ,

Valdivia: 20km S Valdivia Rincon de la Piedra , 15.xi 1981, 180m, Nielsen & Karsholt (2♂, ZMUC) .

Comments: Apiochaeta tincticornis , the most phylogenetically basal of those Apiochaeta without a widened head, is characterized by a strong stripe on the first flagellomere, a large spot surrounding the ocellar tubercle and sometimes a thin stripe on the anterior margin of the frons.

Figures

FIGURES 13–18. External male terminalia; Figs. 13–14: Apiochaeta furcillata sp. n.; 13: left lateral; 14: posterior; Figs. 15–16: A. tincticornis (Malloch); 15: left lateral; 16: posterior; Figs. 17&18: A. varia (Malloch); 17: left lateral; 18: posterior. Abbreviation: S, sternite.

FIGURES 35–38. Internal male genitalia; 35: Apiochaeta furcillata sp. n., left lateral; 36: A. tincticornis (Malloch), left lateral; 37: A. varia (Malloch), left lateral; 38: A. excepta (Malloch) detail of “basal joint” of basiphallus, anterior view.