Citrogramma pennardsi Mengual, 2012

Mengual, Ximo, 2013, Notes on Citrogramma Vockeroth and Eosphaerophoria Frey (Diptera: Syrphidae), Zootaxa 3745 (3), pp. 388-396 : 392-393

Citrogramma pennardsi Mengual, 2012

Figures 4–7, 9–10

Citrogramma pennardsi Mengual, 2012 . Zool. J. Linn. Soc. London, 164: 154, descr., figs, key. Holotype: m, Indonesia: West Java, near Tjibodas, Mount Gedeh, Lebak Saät [RMNH, Leiden] by original designation.

Mengual (2012) describes C. pennardsi based on two males from Java. In a recent visit to the RMNH collection, another three specimens of this species (two males and one female) were found. The description of the female specimen of C. pennardsi is given below.

Differential diagnosis (based on Mengual 2012). Species with yellow face, posterior anepisternum partly black, anepimeron partly black, scutellum with a diffuse or sharply defined macula, metafemur black and large male genitalia. Very distinct from Citrogramma schlingeri Thompson in Mengual, 2012 although they key together, with very large male genitalia and pro- and mesofemur yellow, dark on basal 1/3–1/2. It differs from C. variscutatum (Curran, 1928) by having the sterna yellow, very large male genitalia, and the yellow fascia on 3rd tergum not markedly narrowed posteromedially.

Material examined. The label information for the three specimens is: ‘Museum Leiden / J.v.d. Vecht / Lebak / Saät 2400 m. / 29–VI–1937 ’ ‘ Citrogramma / pennardsi / Det.: X. Mengual 2013’ [1 male and 1 female, RMNH; 1 male, ZFMK].

Description of female. Head. (Fig. 10) Face with facial tubercle, gradually sloping dorsally, more abrupt ventrally, entirely yellow, yellow pilose with black pile dorsolaterally; gena yellow, black pilose, yellow pilose posteriorly; dichoptic; lunule dark brown; frontal triangle yellow, with lateral black vitta on posterior 1/2 on eye margin (see Mengual 2012: figs. 75, 106), black pilose; vertical triangle black, black pilose; ocelli brown; antenna black, black pilose on scape and pedicel; occiput black, silver pollinose, pale pilose on ventral 2/3, golden pollinose, black pilose on dorsal 1/3. Thorax. (Figs 6, 7) Scutum black, with lateral yellow vitta, black pilose except notopleuron yellow pilose on anterior 1/2, densely black pilose on lateral notopleuron and supra-alar area; postpronotum yellow; notopleuron yellow continuing until scutellum, with postalar callus entirely yellow; scutellum yellow with dorsomedial triangular black macula, black pilose, with almost complete subscutellar fringe with black pile. Pleuron yellow, except posterior anepisternum black on anterior 1/2, katepisternum black with dorsal yellow macula, posterior anepimeron black, dorsomedial anepimeron yellow, and anterior anepimeron yellow with black borders, and meron black, entirely yellow pilose; metasternum pilose; calypter yellow with yellow pile on margin; plumula yellow; halter yellow; spiracular fringes yellow. Wing. Wing membrane brownish yellow, entirely microtrichose. Alula microtrichose, broad, broader than cell bm. Legs. Coxa yellow, partly black, mesocoxa black, trochanter dark, yellow and black pilose; pro- and mesofemur yellow, black on basal 1/3; pro- and mesotibia yellow, black pilose; pro- and mesotarsus black; metaleg black, black pilose. Abdomen. (Fig. 7) Slightly oval, margin inconspicuous. Dorsum mainly black, black pilose dorsally and laterally except 1st tergum yellow pilose laterally and 2nd tergum yellow pilose laterally on anterobasal 1/2; 1st tergum black; 2nd tergum black with 2 mesolateral rounded-tip yellow maculae, laterally extending forward to anterolateral tergal margin (like “golf club” shaped spots), yellow lateral margin on anterior 1/3; 3rd and 4th terga black with medial sinuate broad yellow fascia (about 1/3 of tergum length), reaching lateral margins, with lateral margin yellow on anterior 1/3; 5th tergum similar to 3rd and 4th terga, but lateral margin yellow on anterior 1/2; sterna yellow, black pilose except 1st, 2nd yellow pilose and 3rd sternum yellow pilose medially.

Length (N = 1). Body, 10.2 mm; wing, 9.7 mm.

Geographical distribution. Java.

Material examined. 1 female, INDONESIA: West Java, Lebak Saat, 2400 m., 29.vi.1937, J.v.d. Vecht [RMNH].

Remarks. All three specimens found at RMNH are much darker than the holotype and paratype (see Figs 4– 7). Based on this new material, it seems possible that Mengual (2012) based his description on two immature adults, with dark body areas not fully developed. Both males have yellow gena with a black macula ventrad to the eye (Fig. 5), but the female does not have this pattern. All three have the scutellum with a sharply defined basal black triangle (Figs 5, 7), which means that they do not key properly in couplet 35 of Mengual (2012). In addition, the pleura of the male specimens are much darker (anterior anepisternum black, anepimeron black except yellow medially, and katatergum black with a broad yellow macula) and the legs are much darker too (coxae black, pro- and mesofemur black, metaleg entirely black) (Figs 4–7). Although the coloration of these specimens is much darker, the genitalia are identical to those of the type material.