Chrysopilus asiliformis (Preyssler, 1791)

Grootaert, Patrick, Raemdonck, Hugo & O. D., Alain Drumont, 2020, The Rhagionidae or Snipeflies of the Botanical Garden Jean Massart (Brussels-Capital Region, Belgium) with notes on the identity of the rare European species Archicera avarorum Szilády, 1934 and Ptiolina obscura (Fallén, 1814) (Diptera: Rhagionidae), Belgian Journal of Entomology 104, pp. 1-18 : 1-18

Chrysopilus asiliformis (Preyssler, 1791)

Chrysopilus aureus (Meigen, 1804)

Chrysopilus meridionalis Bezzi, 1898

Musca asiliformis Preyssler, 1791

Rhagio aureus Meigen, 1804

Rhagio aurulans Meigen, 1820

Rhagio luridus Meigen, 1820

MATERIAL EXAMINED: Belgium, Brussels-Capital Region: Auderghem, Jardin botanique Jean Massart, 1 male, 21–28 May 2015, MT2 ; 1 male, 5 females, 28 May–4 June 2015, MT1 ; 2 males, 1 female, 10–17 June 2015, MT1 ; 4 males, 17–26 June 2015, MT1 ; 3 males, 7 females, 17–26 June 2015 MT2 ; 6 males, 2 females, 26 June–1 July 2015, MT1 ; 22 males, 19 females, 26 June–1 July 2015, MT2 ; 1 female, 1–8 July 2015, MT1 ; 59 males, 23 females, 1–8 July

2015, MT1 ; 5 males, 58 females, 1–8 July 2015 , MT2 ; 19 males, 11 females, 8–15 July 2015 , MT1 ; 53 males, 36 females, 8–15 July 2015 , MT2 ; 6 males, 8 females, 15–22 July 2015 , MT1 ; 38 males, 30 females, 15–22 July 2015 , MT2 ; 2 males, 3 females, 22–30 July 2015 , MT1 ; 17 males, 9 females, 22–30 July 2015 , MT2 ; 1 male, 30 July–6 August 2015 , MT1 ; 5 males, 2 females, 30 July–6 August 2015 , MT2 ; 4 males, 1 female, 6–12 August 2015 , MT2 (leg. A. Drumont & H. Raemdonck) .

COMMENTS

A total of 671 individuals were collected with respectively 458 males and 213 females or a sex ratio of 68 % males. The details of the flight activity from May to August 2015 can be seen in Fig. 6.

KRIZELJ (1971) observed a similar sex ratio of 70% males for Belgium. In 2015 the first record is a male from 21–28 May 2015 and the latest record was 4 males and 1 female from 6–12 August 2015. The peak activity is in the first week of July 2015 and coincides with that of C. cristatus that however started earlier ( Fig. 6 ) .

Chrysopilus asiliformis is the most abundant species at the Botanical Garden Jean Massart.

Figures

Fig. 6. Phenology of Chrysopilus asiliformis (red line) and C. cristatus (blue line) the dominant snipeflies at the Botanical Garden Jean Massart during 2015.