Citrogramma pinyton, Mengual, 2012

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 : 157

CITROGRAMMA PINYTON MENGUAL SP. NOV.

Description

See description of C. pintada above. Morphologically, C. pinyton and C. pintada are identical, with the same variation in males and females. The only differences between them are the male genitalia (see Figs 155, 156 ) and that specimens of C. pinyton have more black hairs on anepisternum than those of C. pintada .

Length (N = 5): Body, 9.2–10.1 (9.7) mm; wing, 8.9–9.3 (9.0) mm.

Geographical distribution: New Guinea.

Etymology: The specific epithet is derived from the Greek pinytos meaning discreet, cautious ( Brown, 1956: 457). Species epithet to be treated as neuter adjective.

Differential diagnosis: As mentioned above, C. pinyton and C. pintada belong to the same species group, but they can only be separated by male genitalia. The females of C. pinyton were separated based on the locality and dates because of the lack of morphological differences with females of C. pintada .

The three males of C. pinyton were collected in Bome (Goilala District, Central Province , PNG) during March and April with other three females. The males of C. pintada were collected in Wau and surroundings ( Bulolo District , Morobe Province, PNG) from June to December , mainly in October. The localities of Wau and Bome are located at each side of Owen Stanley Range , which divides the south-eastern part of PNG in two slopes facing Coral Sea south and Solomon Sea north. This central mountain-chain has several high mounts, such as Mount Victoria (4072 m), Mount Chapman (3376 m), and Mount Albert Edward (3990 m). In some way, Owen Stanley Range might have separated these two species in the past so that they share adult morphology but not male genitalia .

Holotype male deposited in the Bernice P. Bishop Museum (Honolulu, Hawaii, USA) and labelled: ‘NEW GUINEA: PAPUA/Owen Stanley Range/ Goilala: Bome, 1950 m / III–16–31–1958 ’ ‘W.W. Brandt/ Collector/BISHOP’ ‘ HOLOTYPE / Citrogramma / pinyton /det. X. Mengual 20 10 ’ [red, second and third lines handwritten].

Type locality: Papua New Guinea: Central Province , Goilala District, Bome, 1950 m, 8°16′S, 147°4′E .

Material examined: Type material. Holotype, as above. Paratypes. Owen Stanley Range, Goilala, Bombe, 1950 m, 16–31.iii.1958, W.W. Brandt [1♂ 2♀, BPBM];..., 16–30.iv.1958,... [1♂ 1♀, BPBM] .

Figures

Figures 154–157. Male genitalia. 154, Citrogramma sedlacekorum (from Vockeroth, 1969): a, left lateral view (sternum 8 included); b, superior lobe, lateral, outline only; c, sternum 9, superior lobes and aedeagal base, ventral view; d, right surstylus, lateral view. 155, Citrogramma pintada, left lateral view. 156, Citrogramma pinyton, left lateral view. 157, Citrogramma notiale: a, left lateral view; b, superior lobe, lateral, outline only; c, sternum 9, superior lobes and aedeagal base, ventral view; d, right surstylus, dorsal view.