Citrogramma henryi Ghorpade, 1994:9

Endemic species to the island of Sri Lanka, and the single species found in the island so far. This species is characterized by face entirely yellow with a black macula on genal groove, scutellum yellow with a brownish macula, metafemur black and pro- and mesofemur dark basally. Species very similar to Citrogramma flavigenum, which has gena entirely yellow, scutellar brown macula smaller and less evident and facial tubercle slightly brown. Another diagnostic character is the lateral pilosity of the scutum: C. henryi has notopleuron and supra-alar area black pilose and C. flavigenum has notopleuron and supra-alar area yellow pilose, with little black pile on the posteroventral section of notopleuron.

Citrogramma henryi Ghorpadé, 1994.

Ghorpadé, K. (1994) Diagnostic keys to new and known genera and species of Indian subcontinent Syrphini (Diptera: Syrphidae). Colemania Insect Biosystematics 3, 15 pp.

From Mengual (2011).

MALE.

Head. Face with facial tubercle, gradually sloping dorsally, more abrupt ventrally, entirely yellow, black pilose dorsally and medially, yellow pilose on ventral section, white pollinose laterally; gena yellow with black macula on genal groove, dark and yellow pilose, white pollinose posteriorly (fig. 98); lunule orangish with a dark line delimiting it; holoptic; frontal triangle yellow, black pilose; vertical triangle black, shorter than eye contiguity, black pilose, golden pollinose; ocelli reddish; antenna dark, scape brownish, pedicel black, scape and pedicel black pilose; basoflagellomere orangish, dark dorsally; arista black; occiput black, silver pollinose, pale pilose on ventral 1/2, black pilose on dorsal 1/2 and yellow pilose medially.

Thorax. Scutum black with dorsomedial area almost uniformly grey pollinose with metallic iridescence, entirely black pilose dorsally, with lateral yellow vitta; postpronotum yellow; notopleuron yellow, mainly black pilose, yellow pilose anteriorly; yellow vitta continuing until scutellum, supra–alar area orangish yellow and black pilose; postalar callus entirely yellow, mainly black pilose; scutellum yellow with a dorsomedial broad defined brown macula, black pilose, with a complete (small bare area in middle) subscutellar fringe with black pile. Pleuron entirely yellow pilose, mostly black except: anterior anepisternum yellow, black on posterodorsal part; dorsomedial anepimeron yellow; posterior anepisternum black with yellow macula on posterior 1/2–2/3; katepisternum black with dorsal yellow macula; katepimeron yellow; katatergum mostly yellow, black on posterior margin. Metasternum pilose; calypter yellow with yellow and black pile 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 dark, brownish, coxa yellow pilose, metacoxa with 4–6 long black pile anterolaterally, trochanter black pilose; pro- and mesofemur black on basal 1/3, yellow distally with brownish areas, black pilose; pro- and meso tibiae yellow, black pilose with some yellow pile; metaleg entirely black, black pilose; tarsi black, black pilose dorsolaterally and golden pilose ventrolaterally.

Abdomen. Parallel-sided, 3th, 4th and 5th abdominal terga margined. Dorsum mainly black, black pilose dorsally and laterally except 1st tergum yellow pilose laterally and 2nd tergum yellow pilose laterally on anterobasal 1/4–1/3 and on dorsal yellow maculae; 1st tergum black; 2nd tergum black with 2 mesolateral broad yellow maculae narrowed laterally and extending forward to anterolateral tergal margin, yellow lateral margin on anterior 1/3; 3rd tergum with broad sinuate yellow fascia markedly emarginate posteriorly and narrowed to lateral margins, with broad black fascia on anterior margin; 4th and 5th terga black with similar fascia as the one on 3rd tergum but narrower and posterior emargination less marked; lateral margins of 3rd, 4th and 5th terga partially yellow, about 1/3; sterna yellow, yellow pilose on 1st and 2nd sterna, black pilose on the rest; genital segments yellowish.

FEMALE.

Similar to male except for normal sexual dimorphism and as follows: face yellow, usually with brown area on facial tubercle; lunule dark; frons yellow with anteromedial triangular black or dark area extending posteromedially reaching ocellar triangle, lateral yellow areas not converging posteriorly; dorsal occiput and ocellar triangle golden pollinose; scutum with the dorsomedial grey pollinose area broader, with the lateral black area between lateral yellow vitta and dorsomedial grey pollinose area very narrow or difficult to distinguish; pro- and mesofemur yellow, black on basal 1/4; abdomen more oval, 2nd tergum with maculae narrower, 3rd, 4th and 5th terga with yellow fascia narrower, sinuate but less emarginate.

Variation. Some female specimens have little black pile on posterior margin of anepisternum. The medial brown facial macula or vitta varies in size among studied specimens, but some females have an entirely yellow face.

C. citrinum was cited from Sri Lanka by Vockeroth (1969) and Knutson et al. (1975). These citations are in all probability C. henryi, the only known species from that island.

Among the material in BMNH, there are three specimens with an identification label “Xantho: yerburyi Brun. Det. Brnn. 1921–22”, and two of them have in addition “Type ♂” and “Type ♀” labels for a male and a female respectively. It seems that Brunetti had selected these specimens for his new species dedicated to its first collector, Yerbury, but he never got to publish the name Xanthogramma yerburyi. All of these three specimens correspond to C. henryi.

Synonyms:

Xanthogramma citrinum of Keiser, 1958: 193 (cit., studied material)

Citrogramma citrinum of Vockeroth, 1969: 95, fig. 57 (male genitalia); Knutson et al., 1975 (in part).

Citrogramma sp. C of Wyatt, 1991: 158 (ident. key), 167 (cit. with info.).

Length (5): body, 10.0–11.5 (10.5) mm; wing, 8.8–10.0 (9.4) mm.

Species only known from Sri Lanka.