The small Notoschoenomyza sulfuriceps Malloch, 1934 (Diptera: Muscidae) from the Pampean province in South America

The genus Notoschoenomyza Malloch is a small group of predaceous muscids endemic to South America. Currently, the genus includes eight species, of which only N. immaculate (Walker) and N. costata Snyder are listed for Argentina. This study presents a redescription of N. sulfuriceps Malloch based on male and female specimens, with detailed images of the terminalia, and includes notes on its habitat, new distributional records, and a key to the species recorded from Argentina.

which only N. immaculate and N. costata are recorded from Argentina (Patitucci et al., 2020). The immature instars remain unknown.
Since, N. sulfuriceps was described only with male specimens collected in Montevideo, Uruguay (Malloch, 1934), the aim of this contribution is to present the redescription of N. sulfuriceps based on male and female specimens, with detailed images of the terminalia. This contribution includes notes on its habitat, new distributional records, and a key to the Notoschoenomyza species of Argentina.

MATERIALS AND METHODS
Specimens were identified using the original descriptions (Malloch, 1934) and photographs of type specimens. To study the morphology of terminalia, the abdomen of selected specimens was detached and transferred to 90% lactic acid at room temperature for two weeks. After clearing, the genital structures were removed and temporarily mounted on concave glass slides in glycerin. After the study, the dissected parts were placed in a plastic microvial with glycerin and pinned with the respective specimen. The terminology used for the external morphology follows Cumming & Wood (2017).
The labels of the type specimens examined are cited verbatim, lines separated by a slash, different labels by semicolon, and comments are given in brackets. Digital photographs were taken using an Olympus DP 25 digital camera mounted on an Olympus SZX 16 stereomicroscope, and a Brunel digital camera mounted on a Motic optical microscope. Images were processed with the Olympus cellSens Standard software and Combine ZM. Measurements were digitally obtained with the Leica Application Suite EZ software Version 2.1.0. Maps were created with the QGIS software 2.18.3 (http://www.qgis.org/ pl/site/) and edited with Adobe Illustrator CS6. The shapefile used is available at http://www.ign. gob.ar.
Type material. Notoschoenomyza sulfuriceps: holotype male, pinned, in good condition (BMNH). https://data.nhm.ac.uk/dataset/56e711e6-c847-4-f99-915a-6894bb5c5dea/resource/05ff2255-c38a-40c9-b657-4ccb55ab2feb/record/8675380 Material examined. ARGENTINA. Buenos Aires: Campana, R.N.E. Otamendi, -34.235, -58.891, 22.VII.2015, Patitucci leg Remarks. Notoschoenomyza sulfuriceps is distinguished from its congeners by the black colour of palpi and legs (with reddish only at apex of fore femur); and wings with white spots. Females of this species present a face with silver pruinosity, while males have golden pruinosity on face. Male 5 sternite with a pointed process in the middle line in the apical margin, and several spines on inner surface, cercal plate longer than wide and with a long basal incision on basal margin; surstylus with a curved preapical tip; and phallus with a strongly sclerotized plate surrounding the acrophallus.
Note. Specimens were captured with hand net over vegetation close to different aquatic water environments (rivers, streams, flood areas), alongside specimens of Spathipheromyia.

ACKNOWLEDGMENTS
I thank the National Parks administration, and all the staff of the PN Ciervo de los Pantanos, and PP Ernesto Tornquist for their collaboration, with a special thanks to Liliana Ciotek and Luis Paupy. I am grateful to Pablo Mulieri for his help me with some pictures. Also I wish to thank Alicia Schaller, Victoria Eusevi and Diana Torres. A special thanks to Sofia Olea for the help in the field. I am indebted to Carolina Berta, Emilia Perez, and Dino Rojas for access the IFML collection. I especially thank Nigel Wyatt (BMNH) for providing images of the specimens. I thank to Lucas R. P. Gomes and an anonymous reviewer for their helpful critical comments. Financial support for this study was partially provided by CONICET (Taxonomía y biodiversidad de Calyptratae (Diptera) de Argentina. PIP 2015-2017), and FONCyT (Grant PICT 2012N° 0231, PICT 2015N° 2523, and PICT 2016.