Citrogramma marissa, 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 : 149-151

CITROGRAMMA MARISSA MENGUAL SP. NOV.

Description

Male: Head: Face with facial tubercle, gradually sloping dorsally, more abrupt ventrally, yellow with medial dark vitta from oral apex to antennal base, narrower than yellow lateral areas of face, mainly yellow pilose, black pilose laterodorsally, white pollinose laterally; gena yellow with black vitta on genal suture, mainly yellow pilose with black hairs on black vitta; holoptic; lunule dark; frontal triangle yellow with anteromedial diffuse black subtriangular area pointed posteriorly, black pilose; vertical triangle black, black pilose; ocelli brownish; antenna dark brown, black pilose on scape and pedicel; basoflagellomere orangish, dark dorsally; arista black; occiput black, silver pollinose, yellowish pilose on ventral third, golden-yellow pilose on dorsal two thirds.

Thorax: Scutum black with dorsomedial grey pollinose area and three bluish vittae with some metallic iridescence, lateral yellow vitta, yellow pilose with a few black hairs; postpronotum yellow, black anteriorly; notopleuron yellow continuing until scutellum, with ventral black vitta narrowing yellow area until transverse suture; postalar callus entirely yellow, yellow and black pilose; scutellum yellow with dorsomedial triangular black macula reaching anterior margin, black pilose, with complete subscutellar fringe of black hairs. Pleuron mostly black, except proepimeron yellow, posterior anepisternum with yellow vitta on posterior third, katepisternum with dorsal yellow macula, katepimeron and katatergum with large yellow macula, entirely yellow pilose; metasternum pilose; calypter yellow medially and blackened basally and distally with black hairs on margin; plumula yellow; halter yellow; spiracular fringes yellow.

Wing: Wing membrane almost hyaline, partly microtrichose: costal cell bare (with few microtrichia distally), cells R 1, R 2+3, R 4+5, DM, and CuA 1 bare basally, cell CuP bare dorsally, and cells BM and R almost completely bare ( Fig. 132 ). Alula microtrichose, broad, broader than cell BM.

Legs: Coxa and trochanter dark brown or black, yellow pilose; pro- and mesofemur yellow, brownish very distally, profemur yellow pilose with a few black hairs distally, mesofemur yellow pilose on dorsal third and black pilose on ventral two thirds; pro- and meso tibia yellow; pro- and mesotarsus brown except probasitarsomere yellow, black pilose; metaleg dark brown, black pilose except metafemur yellow pilose dorsally.

Abdomen: Figure 119 . Parallel-sided; terga 2, 3, and 4 clearly 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 extending forward to anterolateral tergal margin (like ‘golf club’-shaped spots), separated for about third of tergum width, yellow lateral margin on anterior half; terga 3 and 4 black with concave yellow fascia on anterior half of the tergum, emarginate posteromedially, more strongly on tergum 4; tergum 5 black with two triangular yellow maculae joined medially; sterna 1 and 2 yellow, sterna 3 and 4 yellow on anterior half and black on posterior half, all of them yellow pilose medially and black pilose laterally; sternum 5 yellow, black pilose; genital segments brownish; male genitalia as in Figures 127 and 130 .

Female: Similar to male except for normal sexual dimorphism and as follows: black facial vitta less evident; genal suture with black vitta less evident; frons yellow with medial very diffuse black triangle towards ocellar triangle reaching the posterior black area or not, with black margin on posterior third; occiput yellow pilose. Scutum black with metallic bluish pollinosity that looks as though it is divided into three vittae, but could be uniformly fused; anterior anepisternum yellow, notopleuron without ventral black vitta, posterior anepisternum with broader yellow fascia, about half; scutellum with dorsomedial black macula more diffuse; anepimeron yellowish ventrally; protarsus brown; metafemur yellowish on basal half; wing a little more bare basally; abdominal tergum 2 with narrower and longer yellow fascia narrowly interrupted medially; terga 3 and 4 with fascia without emargination posteriorly, broader laterally ( Fig. 120 ).

Variation: Paratype male has no posterior emargination on fascia of terga 3 and 4; fascia appears concave but complete. In some individuals the black vitta on genal suture is less evident.

Females are more variable than males. The dark female specimen collected on 15 December 1981 has postpronotum brown; notopleuron black, yellow only on anterior half; dorsum mainly black pilose; posterior anepisternum with narrow yellow vitta; anepimeron black; pro- and mesofemur brown on basal one eighth to one sixth. The three paratype females have similar frons with medial very diffuse broad black macula that does not reach posterior black area.

Length (N = 5): Body, 8.0–8.6 (8.3) mm; wing, 7.2–8.3 (8.0) mm.

Geographical distribution: India.

Etymology: This new species is named after Marissa Sendra i Peiró in her honour. She is the person who gave me support since I started my career and enjoyed and suffered with me in all my field expeditions, museum visits, and life overseas. Species epithet to be treated as a noun in apposition.

Differential diagnosis: Small species with medial black facial vitta and wing extensively bare basally. Citrogramma marissa has costal cell bare like C. pendleburyi ( Figs 131, 132 ), but it differs in having basal wing cells bare and the angle between eyes slightly narrower. Citrogramma marissa is only found in north-east India, and C. pendleburyi is so far known just from the Malay Peninsula.

Holotype male deposited in the National Museum of Natural History (Washington D.C., USA) and labelled: ‘ INDIA: 2000′/ Arunachal Pradesh /Tirap Dist./Hornbill Camp’ ‘ Dec. 8 .1981 /Mary L. Ripley’ ‘ HOLOTYPE / Citrogramma / marissa /det. X. Mengual 20 09 ’ [red, second and third lines handwritten].

Type locality: India: Arunachal Pradesh, Tirap Dist., Hornbill Camp , 610 m, 27°09′N, 95°47′E .

Material examined: Type material. Holotype, as above. Paratypes. INDIA: Arunachal Pradesh, Tirap Dist., Hornbill Camp, 2000 ft, 9.xii.1981, Mary L. Ripley [1♂ 1♀, USNM] ;..., 8.xii.1981,... [1♀, USNM] ;..., 15.xii.1981,... [1♀, USNM] .

Figures

Figures 131–139. 131–134, microtrichia pattern of wing. 131, Citrogramma pendleburyi. 132, Citrogramma marissa. 133, Citrogramma clarum. 134, Citrogramma sp. B. 135–137, Citrogramma asombrosum, male genitalia: 135, left lateral view; 136, tergum 9 and surstyli, dorsal view; 137, terga 7, 8, and 9, and surstyli, lateroventral view (as in pinned specimen). 138–139, Citrogramma australe: 138, left lateral view; 139, tergum 9 and surstyli, dorsal view.

Figures 112–121. 112–115, Citrogramma difficile: 112, dorsal view of male abdomen; 113, dorsal view of female abdomen; 114, dorsal view of female head and lateral view of pleuron; 115, lateral view of male head and pleuron. 116–118, Citrogramma gedehanum: 116, dorsal view of male abdomen; 117, dorsal view of female abdomen; 118, lateral view of male pleuron. 119–120, Citrogramma marissa: 119, dorsal view of male abdomen; 120, dorsal view of female abdomen. 121, Citrogramma pendleburyi, dorsal view of male abdomen.

Figures 122–130. 122–123, Citrogramma frederici: 122, frontal view of female head; 123, dorsal view of female abdomen. 124–126, Citrogramma notiale species group: 124, lateral view of puparium; 125, dorsal view of puparium; 126, posterior view of posterior breathing tube and spiracular openings (detail). 127, Citrogramma citrinum, left lateral view of male genitalia. 128–129, Citrogramma henryi: 128, left lateral view of male genitalia; 129, tergum 9 and surstyli, dorsal view. 130, C. henryi (from Vockeroth, 1969 as C. citrinum): a, left lateral view; b, superior lobe, lateral, outline only; c, sternum 9, superior lobes and aedeagal base, ventral view.