Citrogramma schlingeri, THOMPSON, 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 : 162-163

CITROGRAMMA SCHLINGERI SPECIES GROUP

Females of C. schlingeri , C. distinctum , and C. triton .

Description

Female: Head: Face with a low facial tubercle, gradually sloping dorsally, more abrupt ventrally, with oral apex slightly more prominent than antennal basis, entirely yellow, black pilose; gena yellow, dark pilose; lunule orange; frons yellow with medial triangular brown pointed dorsoposteriorly not reaching ocellar triangle, with posterior black vitta on eye margin from ocellar triangle until antennal base, leaving inverted V-shaped yellow area, black pilose; vertical triangle black, black pilose; ocelli reddish; antenna orangish brown, black pilose on scape and pedicel; basoflagellomere darker dorsally; arista dark brown; occiput black, silver pollinose, pale pilose on ventral half, yellow pilose medially and dark pilose on dorsal third.

Thorax: Scutum black with a dorsomedial area almost uniformly grey pollinose without brightness, with a lateral yellow vitta, mainly yellow pilose with some black hairs except notopleuron yellow pilose on anteromedial half, densely black pilose on lateral notopleuron, on supra-alar area and on postalar callus; postpronotum yellow; notopleuron yellow continuing until scutellum, with postalar callus entirely yellow; scutellum yellow with dorsomedial broad brown macula, black pilose, with sparse incomplete subscutellar fringe with black hairs. Pleuron mostly yellow, except katepisternum black with a dorsal yellow macula, meron black, katatergum black posteriorly, mainly yellow pilose except anterior anepimeron with little black hairs, anepisternum black pilose on posterodorsal quadrant; some specimens with some black hairs on anepimeron; metasternum pilose; calypter yellow, blackened distally and basally with long black hairs on margin; plumula yellow; halter yellow; spiracular fringes yellow.

Wing: Wing membrane brown, costal cell darker like stigma, entirely microtrichose. Alula microtrichose, broad, slightly broader than cell BM.

Legs: Coxa and trochanter orangish yellow, pro- and mesocoxa partly black in some specimens, black and yellow pilose; pro- and mesofemur yellowish distally, and pro- and mesotibia yellowish basally; black pilose; tibia orange-yellow pollinose.

Abdomen: Figure 52 . Parallel-sided, slightly narrowed posteriorly. Dorsum mainly black, black pilose dorsally and laterally except tergum 1 yellow pilose laterally and tergum 2 yellow pilose laterally on anterobasal quarter; tergum 1 black, yellow laterally; tergum 2 black with two mesolateral yellow maculae joined medially forming narrow fascia, extended forwards laterally to anterolateral tergal margin, yellow lateral margin on anterior quarter; terga 3 and 4 black with anterior straight yellow fascia, with margins parallel to anterior margin of tergum, not reaching lateral margin; tergum 5 black with narrow yellow fascia reaching lateral margin; sterna yellow, mainly yellow pilose, black pilose posteriorly.

Variation: Female collected by Samuelson from Mt Missim has tergum 2 with two yellow maculae (like ‘golf club’-shaped spots) separated medially.

Geographical distribution: New Guinea.

Remarks: After reviewing all the available Citrogramma material, there is no doubt about the validity of this taxon but it was not easy to refer these females to any of the three different taxa related to the C. schlingeri species group, i.e. C. schlingeri , C. distinctum , and C. triton . Females of C. pintada , C. pinyton , C. luteifrons , and C. luteopleurum are very close to the females of the C. schlingeri species group. The dark coloration of the costal cell is different and it is very characteristic in C. schlingeri group females.

Material examined: Nontype material. PAPUA NEW GUINEA: Wau, Mt Kaindi , 8000 ft, 10.vi.1968 , J.W. Boyes [1♀, CNC]; (NE) 6 km W of Wau, Nami Creek , 1700 m, 10.vi.1962 , Malaise trap, J. Sedlacek [1♀, BPBM]; NE Morobe Province, Mt Missim , 1900 m, 10–15.v.1967 , G.A. Samuelson [1♀, BPBM]; NE Mt Hagen , 5°48′S, 143°57′E. 3400 m, 6.vi.1966 , J.L. Gressitt [1♀, BPBM]; NE Mt Missim , 2800 m ,

23.iv.1968, J. Sedlacek [1♀, BPBM]; Mt Wilhelm , 9200 ft , v.1963, W.W. Brandt [1♀, ANIC] .

Figures

Figures 51–62. 51–52, Citrogramma schlingeri: 51, dorsal view of male abdomen; 52, dorsal view of female abdomen. 53, Citrogramma flavigenum, dorsal view of male abdomen. 54–55, Citrogramma sp. 1: 54, dorsal view of female abdomen; 55, wing. 56, C. flavigenum, dorsal view of male head. 57–60, Citrogramma luteopleurum: 57, dorsal view of female head; 58, dorsal view of male head and lateral view of scutum; 59, dorsal view of male abdomen; 60, dorsal view of female abdomen. 61–62, Citrogramma pintada: 61, dorsal view of male abdomen; 62, dorsal view of female abdomen.