Apiochaeta costalis ( 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 : 15

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

Fig. 9

Alloclusia costalis Malloch, 1933: 239 .

Description ( Fig. 9 )

Male. Body length 4.3mm. Arista pubescent. Three fronto-orbital bristles with posterior bristle slightly inset. Acrostichal bristle absent. Two pairs of small lateral scutellar bristles. Scutum yellow with one pair of faded brown postsutural stripes that do not reach posterior margin. Scutellum yellow. Laterotergites brown lateral to scutellum. Pleuron and legs yellow with anepimeron and dorsal suture of anepisternum brown. Head yellow with; face and parafacial light yellow, gena and occiput white, ocellar tubercle brown and parafacial and dorsal half of gena silvery tomentose. Abdomen brown with terminalia yellow. Wing dark in subcostal cell and lightly clouded around apices of R 2+3 and R 4+5.

Female. As described for male except anepimeron yellow.

Male terminalia. Not dissected. Surstylus most similar to that of A. furcillata , but posterior process reduced to posterobasal lobe.

Holotype: ARGENTINA. Río Negro: Bariloche , Agr., xi.1926, R.&E.S. Shannon (♂, USNM).

Additional material examined: CHILE. Arauco: Peilles-Pilli., Cord. Nahuelbuta, 19.i.1954, 6– 800m, L. Peña (♀, CNC), R.I.X, PN Nahuelbuta, 8–24.ii. 2005, 1168m, 37°49’30”S, 72°58’24”W, Malaise trap in meadow and Nothofagus, UCR AtoL (♀, CNC) .

Comments: The wing of Apiochaeta costalis is unique in that it is almost entirely unpigmented in all areas except the subcostal cell, which is very dark.

Figures

FIGURES 3–9. Wings; 3: Apiochaeta philippii (Rondani); 4: A. pictipennis (Wulp); 5: A. chiloensis (Malloch); 6: A. vitticollis (Blanchard); 7: A. lenticula sp. n.; 8: A. varia (Malloch); 9: A. costalis (Malloch).