Pelecocera (Chamaesyrphus) scaevoides (Fallén, 1817)

Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2020, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V, Zoodiversity 54 (3), pp. 237-258 : 247-249

Pelecocera (Chamaesyrphus) scaevoides (Fallén, 1817) ( figs 36–41 )

M a t e r i a l e x a m i n e d. Ukraine. Ivano-Frankivsk Region: Zelena env., 48.413701 N 24.379997 E, alpine meadow, 20.06.2018, 3 {, 5} ( V. Shparyk) .

D i s t r i b u t i o n: Andorra, Austria, Belgium, Bulgaria, Croatia, the Czech Republic, Estonia, Finland, France, Germany, Great Britain ( Scotland), Greece, Hungary, Italy, Latvia, Liechtenstein, Luxembourg, Moldova, Montenegro, the Netherlands, Norway, Poland, Romania, Serbia, the Slovak Republic, Slovenia, Spain, Sweden, Switzerland; Russia (European part, Yakutia, the Far East); Transcaucasia (the Republic of Georgia), Turkey ( Bańkowska, 1963; Peck, 1988; Verlinden, 1991; Maibach et al., 1992; Kuznetzov, 1993; Dirickx, 1994; Belcari et al., 1995; Holinka & Mazánek, 1997; Wolff, 1998; Nielsen, 1999; Carrières, 2001 b; Stubbs & Falk, 2002; Stănescu & Pârvu, 2005; Gammelmo & Nielsen, 2008; Mielczarek, 2009 –2020; Reemer et al., 2009; De Grootet al., 2010; Tóth, 2011, 2014; Williams et al., 2011; Haarto & Kerppola, 2014; Saribiyik, 2014; Ricarte & Marcos-García, 2017; Barkalov & Mutin, 2018; Miličić et al., 2018; Speight et al., 2018; Mengual et al., 2020; Speight, 2020; Wakkie, 2020); Ukraine (first record).

Diagnosis. Both sexes of P. scaevoides are similar to P. caledonica (Collin, 1940) in sharingthe following characters: anterodorsal portion of anepisternum without pile or setae, at most with thick microtrichia; frons, at the level of the antennal sockets, narrower than the width of an eye at the same level ( figs 40, 41 ); propleural and mesopleural sclerites entirely covered in grey microtrichia ( fig. 38 ); lateral arms of the lunule (extending round the dorsal edge of the antennal sockets) entirely shining, or entire lunule shining. From the male P. caledonica the male of P. scaevoides differs by: face entirely covered in microtrichia ( figs 39, 40 ) (in P. caledonica , face with median black vitta shining); the length of postocular orbits is dorsally, at the inner end of the eye, shorter than a posterior ocellus (in P. caledonica , the length of the postocular orbits is dorsally, at the inner end of the eye, longer than a posterior ocellus); wing entirely covered in microtrichia (in P. caledonica , basal medial (bm) and posterior cubital cells (cup) of the wing each with an area bare of microtrichia); tarsomeres 3+4 of fore and mid tarsi entirely pale, as well as the tibiae ( fig. 37 ) (in P. caledonica , tarsomeres 3+4 of fore and mid tarsi brown, darker than the tibiae); lunule with median triangle entirely, or partly, covered in dense, grey microtrichia (in P. caledonica , lunule entirely undusted, brightly shining) ( Speight & Sarthou, 2017).

The female of Pelecocera scaevoides ( fig. 41 ) can be separated from the female of P. caledonica by: at the inner corner of the eye, on the dorsal surface of the head, the distance between the posterior margin of the eye and the posterior margin of the head is slightly greater than the length of a posterior ocellus, but distinctly less than 1.5x as long as a posterior ocellus (in P. caledonica , the distance between the posterior margin of the eye and the posterior margin of the head is slightly greater than 1.5x the length of a posterior ocellus); wing entirely covered in microtrichia (in P. caledonica , basal medial (bm) and posterior cubital cells (cup) of the wing each with an area bare of microtrichia) ( Speight & Sarthou, 2017).

Note. In Great Britain this species is listed under the UK Biodiversity Action Plan and qualified as Nationally Scarce ( Ball & Morris, 2014).

Subfamily Syrphinae

Figures

Figs 36–41. Pelecocera (Chamaesyrphus) scaevoides: 36 — male habitus, dorsal view; 37 — male habitus, lateral view; 38 — male head and thorax, lateral view; 39 — male head, anterolateral view; 40 — male head, frontal view; 41 — female head, frontal view.