Pelecinobaccha gracilitas

Miranda, Gil Felipe Gonçalves, Marshall, Stephen A. & Skevington, Jeffrey H., 2014, Revision of the genus Pelecinobaccha Shannon, description of Relictanum gen. nov., and redescription of Atylobaccha flukiella (Curran, 1941) (Diptera: Syrphidae), Zootaxa 3819 (1), pp. 1-154 : 43-44

Pelecinobaccha gracilitas Miranda sp. nov.

Map 5. Figure 5 .

Type locality. Brazil, Amazonas, Manaus, Km. 65, Boa Vista Rd., 3°5.725'S 59°55.376'W. Holotype male CNC.

Male. Head: Black. Face pale with a narrow medial black vitta from tubercle apex to antennal base where it becomes diffuse, entirely white pilose. Lunule mostly dark, very slightly lightened above antennal insertions. Frontal triangle black, pale laterally, with white pollen laterally, connected to pollen from face, black pilose medially, pile white on pale region around frontal prominence. Vertical triangle with a median row of long black pile; ocellar triangle separated by its length from posterior eye margin. Eye contiguity as long as vertical triangle length. Eye with posterior indentation at level of antennal insertion. Antennal insertions confluent. Occiput with sparse white pollen on dorsal ¼ and more concentrated white pollen on ventral ¾; dorsal ¼ of occiput with 1–2 rows of simple black pile, anterior row with very short pile, middle 2⁄4 with 2–3 rows of white scale-like pile, anterior rows shorter; ventral ¼ with 2 regular rows of white, scale-like pile.

Thorax: Scutum black, dull brown-pollinose except for indistinct white-pollinose pair of sub-median vittae and a narrow white-pollinose median vitta on anterior ⅔; most of scutum white pilose, pile slightly longer on notopleuron, with anterior row of shining white pile interrupted in the middle. Scutellum black, pale on basal ⅓, white pilose, subscutellar fringe pile long and white. Pleuron black, white on posterior ½ of posterior anepisternum and dorso-posterior region of katepisternum; pleuron entirely white pilose. Plumula long and white. Calypter white. Halter yellow.

Wing: Hyaline or light brown, with dark anterior margin (dark on cells bc, c, sc and basal ⅓ of r1), entirely microtrichose; alula linear, expanding slightly apically, from ⅔ of the width of c cell basally to 2 times larger apically, hyaline, bare on posterior ½.

Legs: Proleg pale, procoxa, protrochanter, apico-dorsal ½ of profemur, small subapical macula on protibia, basal ½ of probasitarsomeres and 3rd to 5th tarsomeres brown. Mesoleg mostly pale, mesocoxa, mesotrochanter, mesofemur basal and apical ⅓, subapical ventral spot on mesotibia and the 2 apical mesotarsomeres brown; mostly white pilose, black pilose on apical ⅓ of mesofemur, posterior row of mesofemur with white pile basally. Metaleg brown, base and apex of metafemur, basal ⅓ of metatibia and apical ⅓ of metabasitarsomere until 4th metatarsomere pale; pile on metacoxa and metatrochanters mostly white.

Abdomen: Black; ~4.5 times as long as thorax. First tergite pale laterally; entirely white pilose, pile longer laterally. Second tergite very long, length ~9.5 times minimum width, with pair of sub-median lateral pale spots; 2nd tergite dull black-pollinose on baso-dorsal ¾ and laterally immediately posterior to pale maculae; 2nd tergite pile mostly short and appressed, long and erect laterally, white laterally and basally, otherwise black. Third tergite trapezoidal and long, length ~8 times minimum width, with sub-basal lateral oval pale maculae; 3rd tergite with narrow central triangular region of dull black pollen, and pile mainly appressed and black, with some longer and erect white pile on baso-lateral corners. Fourth tergite rectangular and long, with sub-basal lateral quadrate pale maculae; 4th tergite with short, appressed, white pile on baso-lateral corners, and remaining characteristics as on 3rd. Fifth tergite rectangular and wide, without pale maculae; with a small triangular region of dull black pollen; pile short, appressed and black. Genitalia: Cercus with 1 regular row of pile on medial margin and 3 regular rows on lateral margin. Surstylus sub-oval, with a short medial curved fold on basal ½, directed ventrally, with sparse setulae ventrally on apex (around 20) and 4 setulae basally, pilose anteriorly on the dorsal surface. Subepandrial sclerite rectangular and wide with short baso-lateral extensions, homogeneously sclerotized. Hypandrium with rounded ventral notch on anterior ⅔. Basiphallus with posterior acute projection short; distiphallus apex straight. Postgonite with ventral and dorsal surfaces mostly straight, apex convex anteriorly, with enlarged acute ventral extremity and very short acute dorsal extremity.

Female. Like male except: Face with only a black spot on apex of tubercle. Lunule pale above antennal insertions, central maculae broadly connected to frons color. Frons black with pale lateral margin on ventral 4/5, with sparse white pollen. Vertex with 1 row of short black pile. Ocellar triangle ~2 times its length from posterior eye margin and ~1 ocellus-width from lateral eye margin. Scutellum with short white pile, subscutellar fringe pile normal and white. Wing hyaline with anterior dark margin (dark on cells bc, c, sc, basal ½ anterior to vein sv on cell r, basal ½ of r1 and infuscated on base of r2+3); alula mostly bare, with a few microtrichia on anterior margin. Probasitarsomere and 3rd protarsomere pale. Mesofemur with apical ⅔ brown. Basal ¼ of metatibia and apical ½ of metabasitarsomere until 4th metatarsomere pale. Second abdominal tergite length 6.8 times minimum width. Third tergite length 4.5 times minimum width. Fifth tergite sub-quadrate. Sixth segment divided into tergite and sternite. Genitalia: 7th tergite with long anterior acute projection, with a pair of lateral, narrow basal extensions into the 6th segment, extensions ⅔ the length of the 6th; 7th segment lateral sclerite oval, acute baso-ventrally. Eighth tergite entirely sclerotized, apex whole, basal crest weak; 8th sternite whole, weakly sclerotized medially. Tenth tergite as a pair of sclerites fused to dorsal surface of the cerci. Cercus with a single row of pile on apical margin.

Length. 11–13.5mm; wing 7.5–10.5mm.

Distribution. Brazil (Amazonas, Santa Catarina), Colombia (Boyaca).

Primary type. Holotype: Pinned male in good condition, with genitalia dissected and placed in a plastic tube pinned with the specimen. Holotype labels: ‘ Brazil, Manaus // Km.65,BoaVistaRd. // 14.III.1973 // B.V.Peterson’ ‘CNC Diptera // # 161193 ’ ‘ Holotype // Pelecinobaccha // gracilitas // Miranda’ [red label].

Paratypes. BRAZIL. Santa Catarina, Nova Teutônia, 300–500m, 27°11'S 52°23'W, Dec 1948, F. Plaumann (1 ♀, CNC Diptera 161191). COLOMBIA. Boyaca, Muzo, 900m, Frank M. Hull Collection C.N.C. 1973, 1936, J. Bequaert (1 ♂, CNC Diptera 161192).

Etymology. The specific epithet refers to the slender aspect of the fly. The name is to be treated as a noun in apposition.

Figures

FIGURE 5. Pelecinobaccha gracilitas sp. nov. a – d. Female genitalia: a. 7 th tergite, dorsal. b. Apex, dorsal. c. 7 th segment, lateral. d. Apex, lateral. e – i. Holotype: e – h. Male genitalia: e. Epandrium, lateral. f. Epandrium, ventral. g. Hypandrium, lateral. h. Hypandrium, ventral. i. Habitus, dorsal. 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.