Citrogramma matsumurai, 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 : 151-152

CITROGRAMMA MATSUMURAI MENGUAL SP. NOV.

Xanthogramma fumipenne of Shiraki, 1930 (in part).

Description

Male: Head. Face with facial tubercle, gradually sloping dorsally, more abrupt ventrally, entirely yellow, yellow pilose; gena yellow, yellow pilose; lunule yellow; holoptic; frontal triangle yellow, black pilose; angle between eyes approximately 115° ( Fig. 70 ); vertical triangle black, black pilose; ocelli reddish; antenna brown, black pilose on scape and pedicel; basoflagellomere brownish, dark dorsally; arista brown; occiput black, yellowish pilose with dark hairs on dorsal third.

Thorax. Scutum black, with lateral yellow vitta, mainly yellow pilose; postpronotum yellow; notopleuron yellow continuing until scutellum, yellow pilose; postalar callus yellow, black and yellow pilose; scutellum yellow, black pilose, subscutellar fringe of black hairs. Pleuron mostly yellow, except katepisternum black with large dorsal yellow macula, meron black, katatergum black posteriorly, entirely yellow pilose; metasternum pilose; calypter yellow; plumula yellow; halter yellow; spiracular fringes yellow.

Wing: Wing membrane hyaline, entirely microtrichose. Alula microtrichose, broad, broader than cell BM.

Legs: Coxa and trochanter yellow brownish; pro- and mesofemur yellow; pro- and mesotibia yellow; metafemur yellow on basal half to three fifths, black on distal half to two fifths; metatibia black; tarsi black.

Abdomen: Figure 72 . Parallel-sided, terga 3–5 margined. Dorsum mainly black, black pilose dorsally and laterally except tergum 1 yellow pilose laterally and tergum 2 yellow pilose laterally on anterobasal half; tergum 1 black; tergum 2 black with two mesolateral round yellow maculae, laterally extended forwards to anterolateral tergum margin, yellow lateral margin on anterior half; tergum 3 black with broad (about half tergum length) straight yellow fascia with margins parallel to edge of tergum; tergum 4 similar, black with broad (about half tergum length) yellow fascia broadened laterally with anterior margin parallel to tergal edge and posterior margin slightly curved; tergum 5 black with two broad yellow maculae with lateral margin almost entirely yellow; sterna yellow, yellow pilose; male genitalia small, as in Figure 145 .

Female: Head: Face with facial tubercle, gradually sloping dorsally, more abrupt ventrally, entirely yellow, yellow pilose, dark brown pilose dorsolaterally; gena yellow, yellow pilose with brown hairs on genal suture; lunule yellow; frons yellow with narrow black area posteriorly making larger black area of ocellar triangle, black pilose ( Fig. 71 ); ocellar triangle black, black pilose; ocelli reddish; antenna yellowish, black pilose on scape and pedicel; basoflagellomere dark dorsal; arista dark; occiput black, silver pollinose, yellow pilose.

Thorax: Scutum blackish, with lateral broad yellow vitta, yellow pilose with black hairs scarcely on dorsal section and on postalar callus; postpronotum yellow; notopleuron yellow continuing until scutellum, with postalar callus entirely yellow; scutellum yellow, black pilose, with complete subscutellar fringe of black hairs. Pleuron mostly yellow, except katepisternum black ventrally and meron black, entirely yellow pilose; metasternum pilose; calypter yellow, with long yellow and short dark hairs on margin; plumula yellow; halter yellow; spiracular fringes yellow.

Wing: Wing membrane light brown, entirely microtrichose. Alula microtrichose, broad, broader than cell BM.

Legs: Coxa and trochanter yellow; pro- and mesofemur yellow; pro- and mesotibia yellow; pro- and mesotarsus dark brown; metafemur yellow on basal two thirds to three quarters, brown/dark on distal quarter to third; metatibia dark brown with medial yellow ring; metatarsus dark brown, black pilose.

Abdomen: Figure 73 . Parallel-sided, slightly oval; terga 3, 4, and 5 margined. Dorsum mainly black, black pilose dorsally and laterally except tergum 1 yellow pilose laterally and tergum 2 yellow pilose laterally on anterobasal third and dorsally on yellow maculae; tergum 1 black, yellow laterally; tergum 2 black with two mesolateral round yellow maculae, laterally extending forward to anterolateral tergal margin (like ‘golf club’-shaped spots), yellow lateral margin on anterior fifth; terga 3 and 4 black with broad yellow fascia, about third of tergum length; tergum 5 black with very broad yellow fascia with posterior margin curved, widened laterally; sterna mainly yellow, yellow, and black pilose.

Length (N = 3): Body, 13.0–13.2 (13.1) mm; wing, 10.3–10.9 (10.6) mm.

Geographical distribution: Taiwan, New Guinea.

Etymology: The specific epithet refers to Shonen Matsumura (1872–1960), a pre-eminent Japanese entomologist who worked mainly on the fauna of Japan and Taiwan, and named more than 1200 new species of insects. Species epithet to be treated as a noun in apposition.

Differential diagnosis: Species with entire yellow face, wing entirely microtrichose, anepisternum yellow and anepimeron yellow. Citrogramma matsumurai is similar to C. amarilla , from which differs by the angle between eyes (approximately 100° or under in C. amarilla ), fifth tergum with a yellow fascia ( Fig. 67 ), and frons and abdominal pattern in females: C. amarilla has frons completely yellow with posterior black margin sinuate following ocellar triangle ( Fig. 66 ) and second abdominal tergum with yellow fascia ( Fig. 68 ).

Remarks: Matsumura described X. fumipenne based on a single male from Horisha, Taiwan (Formosa) ( Matsumura & Adachi, 1916). Later, Shiraki (1930) redescribed X. fumipenne and included a description of the female. As mentioned above, there were three different taxa within X. fumipenne of Shiraki (see remarks under C. fumipenne ). The female studied by Shiraki (1930) is here transferred to a new species, C. matsumurai Mengual sp. nov.

A full description of the male and female of C. matsumurai is provided to clarify the morphology of this species. The female from PNG keys out to C. matsumurai , but I doubt her identity because scutellum may have an unclear dark macula, indistinct because of specimen condition. Hence, this female is not included in the type material.

Holotype male deposited in the Museum of Comparative Zoology, Harvard University (Cambridge, USA) and labelled: ‘Hori/Formosa/VI–6–34’ ‘L. Gressitt/Collector’ ‘MCZ’ ‘ Citrogramma /citrinum/ (Brunetti)/K. Ghorpadé det. 2009’ ‘ HOLOTYPE / Citrogramma / matsumurai /det. X. Mengual 20 10 ’ [red, second and third lines handwritten].

Type locality: Taiwan: Taiwan (Central Formosa), Nantou Hsien (= Nantou County), Puli (= Hori –sha), 23°59′N, 120°57′E .

Material examined: Type material. Holotype, as above. Paratypes. TAIWAN: Taikan , 18.ix.1924, T . Shiraki & J. Sonan. ‘ Xanth. fumipenne Mats. Det. T. Shiraki’ ‘ Type’ [1♀, NIAS] .

Nontype material. PAPUA NEW GUINEA: SE, Mt Giluwe, 2500 m, 1.v.1963, J. Sedlacek [1♀, BPBM] .

Figures

Figures 63–75. 63, Citrogramma pintada, dorsal view of male head. 64–65, Citrogramma sp. 2: 64, lateral view of pleuron and dorsal view of female head; 65, dorsal view of female abdomen. 66–69, Citrogramma amarilla: 66, dorsal view of female head; 67, dorsal view of male abdomen; 68, dorsal view of female abdomen; 69, lateral view of female pleuron and head. 70–73, Citrogramma matsumurai: 70, dorsal view of male head; 71, dorsal view of female head; 72, dorsal view of male abdomen; 73, dorsal view of female abdomen. 74–75, Citrogramma clarum: 74, dorsal view of male head; 75, dorsal view of female head.

Figures 145–150. Male genitalia. 145, Citrogramma matsumurai, left lateral view. 146, Citrogramma wyatti, left lateral view. 147–148, Citrogramma pennardsi: 147, left lateral view; 148, tergum 9 and surstyli, dorsal view. 149, Citrogramma robertsi, left lateral view. 150, Citrogramma quadratum, left lateral view.