Citrogramma arisanicum

Mengual, Ximo, 2012, The flower fly genus Citrogramma Vockeroth (Diptera: Syrphidae): illustrated revision with descriptions of new species, Zoological Journal of the Linnean Society 164 (1), pp. 99-172 : 128

CITROGRAMMA ARISANICUM ( SHIRAKI, 1930) COMB. NOV.

Xanthogramma arisanicum Shiraki, 1930: 405 . Lectotype: ♂, NIAS, here designated. Type locality: Taiwan: Arisan, here restricted by lectotype designation. Shiraki,1930: 405, fig. 93a, b.

Xanthogramma arisanica of Knutson et al., 1975: 320.

Geographical distribution: Taiwan, Hainan.

Differential diagnosis: Very distinct species with a medial black facial vitta, scutellum without defined black triangle ( Figs 20, 21 ), metafemur mainly yellow and small male genitalia. Species with a medial black facial vitta less evident than in other species, e.g. C. circumdatum . Male has anepimeron black and a broad yellow fascia on abdominal terga 3, 4, and 5 ( Fig. 20 ). Female has anepimeron yellow, a broad yellow fascia on abdominal terga 3, 4, and 5 and tergum 2 with two yellow maculae slightly joined medially ( Fig. 21 ). The paralectotype shows the dorsomedial area of the scutum covered with grey pollinosity and a bluish metallic iridescence divided by two black vittae. In the male lectotype, this character cannot be seen.

Remarks: Species originally described as Xanthogramma arisanicum Shiraki 1930 . Only a male and a female of the type series were available for study, and both specimens belong to Citrogramma .

Shiraki based his species on a series of three females and two males from different localities in Taiwan, such as Arisan, Shishito, Kosempo, and Fuhosho, but he did not designate a holotype in his work. Amongst the syntypes, deposited at the Natural Resources Inventory Center (National Institute for Agro-environmental Sciences, Ibaraki, Tsukuba, Japan), there is a pinned male labelled ‘Formosa./ Arisan, 1918/X 2–23. /J. Sonana,/M. Yoshino’, ‘ Xanthogramma / arisanicum /Det. T. Shiraki’ [handwritten except third line], ‘ Type ’ [round, handwritten in red] ‘ LECTOTYPE / Citrogramma / arisanicum /det. X. Mengual 20 09 ’ [red, second and third lines handwritten]. This specimen is here designated as the lectotype to fix and ensure the universal and consistent interpretation of the name. The other female syntype has been labelled as a paralectotype.

Type locality: Taiwan: Nantou County, Mount Arisan , 23°34′N, 120°49′E .

Material examined. Type material. Lectotype, as above. Paralectotype. TAIWAN: Formosa [= Taiwan], Arisan, 2–23.x.1918, J. Sonana & M. Yoshino [1♀, NIAS] .

Nontype material. CHINA: Hainan, Wuzhishan City, Shuiman Town , 23–25.v.2007, Ba Yi-Bi & Lang Jun- Tong [1♂ 1♀, SBSC] (Huo, unpubl. data) .

Figures

Figures 15–26. Dorsal view of abdomen. 15–16, Citrogramma bicornutum: 15, female; 16, male. 17, Citrogramma asombrosum, male. 18–19, Citrogramma quadratum: 18, male; 19, female. 20–21, Citrogramma arisanicum: 20, male; 21, female. 22, Citrogramma australe, male. 23–24, Citrogramma notiale: 22, female; 24, male. 25–26, Citrogramma robertsi: 25, female; 26, male.