Chrysotoxum gracile Becker, 1921

Steenis, Jeroen van, van Zuijen, Menno P., Ricarte, Antonio, Marcos-García, M. Ángeles, Doczkal, Dieter, Ssymank, Axel & Mengual, Ximo, 2020, First records of Chrysotoxum volaticum Séguy, 1961 from Europe and Platycheirus marokkanus Kassebeer, 1998 from Spain (Diptera: Syrphidae) together with additional records of Spanish Chrysotoxum Meigen, 1803, Bonn zoological Bulletin 69 (1), pp. 141-155 : 150-151

Chrysotoxum gracile Becker, 1921

Distribution. Spain and France (Becker, 1921; Speight et al., 2013). In Spain, recorded only from the provinces of Avila, Huesca and Madrid ( Ricarte & Marcos-García, 2017).

Examined material. Spain: 3♂, 1♀ (MZW), Albacete, Sierra de Alcaraz, Puerto de las Crucetillas, 38°32’ N 2°24’ W, 1100 m, 21-VI-2003, M.P. van Zuijen; 1♀ (JSA), Albacete, Sierra de Alcaraz, Puerto de las Crucetillas, 38°31’ N 2°26’ W, 1400 m, 21-VI-2003, J. van Steenis; 3♂ (CPP), Cantabria, Potes, Las Ilces, 43˚06’41”N, 4˚45’27” W, 754 m, 26-VI-2017, CJ Palmer; 1♀ (CEUA), Madrid, Universidad Rey Don Juan Carlos, en Sil. rupestris , 21-VII-2011, Chrysotoxum festivum ? det. MªA. Marcos, Chrysotoxum gracile det. Ricarte and Nedeljković X-2019 (103); 2♂ (CPP), Palencia, Alto de la Varga, 42˚54’32”N, 4˚38’33” W, 1404 m, 24-VI-2017, CJ Palmer.

Remarks. This species ( Fig. 1C) can be identified using the key in Speight et al. (2016). The narrower abdomen and the bicoloured metafemur, although sometimes very vague, are good characters to separate this species from Chrysotoxum festivum in which the abdomen is wider and the metafemur is almost entirely darkish orange-yellow, strongly contrasting with the yellow metatibia. The specimens from Sierra de Alcaraz were found visiting flowers of Thapsia villosa , while that from Madrid was found in flowers of Silene rupestris L. This is the first record for the province of Albacete.