Tephritidae: Diptera)
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Vol. 25, March 1,1985 59 The Schistopterinae of Indonesia and New Guinea (Tephritidae: Diptera) D. ELMO HARDY12 ABSTRACT The subfamily Schistopterinae is revised for Indonesia including all of Borneo and for New Guinea and adjacent islands of the Bismarcks and Solomons. Three genera and 10 species are treated, Pararhab- dochaeta is described as a new genus and P. albolineata as a new species. Pararhabdochacla comvrgens (Hardy) is a new combination. Subfamily Schistopterinae This subfamily is characterized by the distinctive wing features: having a deep cleft in costa at end of vein Sc, and with a prominent lobe bearing the 2 costal bristles at end of 2nd costal section; the wing markings consisting of radiating dark lines extending to costa along anterior and usually apical margins (Fig. 6b); center of wing brown with reddish bullae (shining areas) in cells R5 & M2; cell Sc very short, usually higher than long with vein Ri ending before level with r-m crossvein; no distinct lobe at apex of cell Cu; head with pale yellow-white, flattened, scalelike ocellar, postocellar and outer vertical bristles and (except in Schistopterum Becker and Pararhabdochaeta n. genus) with flattened interfrontal bristles and with some flattened, modified, inferior fronto-orbital bristles. Parallel evolution of the distinctive schistopterine wing markings has occurred in the Tephritinae genera Acrotaeniacantha Hering; Neorhabdochaeta Malloch; Para- cantha Coquillett and Noeeta Robineau-Desvoidy in the new world and Palaearctic regions and a new genus of Trypetinae from New Britain (Hardy, in press). The subfamily is of African origin, with 10 genera occurring in the Ethiopian region. One of these, Rhabdochaeta de Meijere is widespread over the tropics of the world except for the Neotropical region, 1 species of Schistopterum is now known from New Guinea (Hardy 1982) and 1 new genus, Pararhabdochaeta is herein described. Three genera and 10 species are presently known from Indonesia-New Guinea. Apparently all breed in the flowerheads of Compositae. KEY TO GENERA AND SPECIES OF SCHISTOPTERINAE KNOWN FROM INDONESIA AND NEW GUINEA 1. Veins R4»s and Mw only slightly diverging or nearly parallel at apices; vein R2+3 ending near apical W of wing; cell Sc longer than high; with brown rays through apex of wing (Fig. 7b); ocellar bristles situated outside ocellar triangle, slightly anterior to median ocellus 2 R-es and Mm widely diverging at apices; R20 ending at middle of wing; cell Sc extremely narrow; no brown rays in apex of wing (Fig. 1); Ocellar bristles situated in the margins of the triangle posterior to median ocellus Schistopterum ismayi ■Journal Series No. 2848 of the Hawaii Institute of Tropical Agriculture and Human Resources. 'Senior Professor of Entomology, Emeritus, Univeisity of Hawaii, Honolulu, Hawaii, 96822. go Proceedings, Hawaiian Entomological Society 2(1). Third antennal segment slender, 3 or more times longer than wide and drawn out into a slender point at apex; front femur not with a row of posteroventral spines; interfrontal bristles present; upper inferior fronto-orbital bristles usually flattened, often lan ceolate. Rhabdochaeta 3 Third antennal short, not much longer than wide and with an acute point at upper apex (Fig. 3b); front femur with a row of 6-11 short black posteroventral spines before apex; wings with 4 black marks through cell Ri in addition to the marks at base and apex of cell and with seven pale, subhyaline lines extending longitudinally across wing at level with cell Sc (Fig. 2b); no flat tened bristles on front. Pararhabdochaela n. genus 8 3(2). The radiating rays along anterior margin of wing are broad, consist ing of a white streak through middle bordered by brown on each side (Fig. 7b) 4 The dark rays to wing margin consist of narrow brown to black streaks 5 4. With 2 complete brown rays through 2nd costal cell, no bulla in cell 2nd M2 and vein Mm only slightly convex beyond m crossvein (Fig. 8); apical Vi of 5th tergum of $ polished black. Timor ; • tribulosa With only 1 ray through 2nd costal; with a large reddish bulla in upper basal portion of cell 2nd M2 and with vein Mm sharply curved upward above the bulla (Fig. 7b); abdomen entirely opaque brownish yellow. Java. pukhella 5(3). One pair of dorsocentral bristles situated near the suture; only 1 ray through middle of cell Ri; vein Mm strongly upcurved just beyond m crossvein and with a red bulla in basal portion of cell 2nd M2 6 Two pairs of dorsocentrals, 1 presutural and 1 postsutural; 2 rays through Ri; vein Mm only slightly upcruved and no red bulla in 2nd M2 (Fig- 9c). Indonesia, New Guinea, Southeast Asia venusta 6(5). Brown ray in apex of cell Rs incomplete, isolated (Fig. 4b); only 1 pair of interfrontal bristles • 1 With a long, complete ray through middle of Rs (Fig. 5b); 2 pairs of interfrontal bristles. Solomon Islands, New Britain, New Guinea cockeri 7(6). Only 1 brown ray through middle of cell Rj (Fig. 4b); with a brown mark on upper parafacial. Widespread over Oriental region, Japan, Ryuku Islands osteria Two rays through cell R3 and face all pale yellow. Thailand, Philippines, Malaysia Barat and Sarawak multiiineata 8(2). Wing lacking longitudinal lines of white through middle: abdomen entirely gray pollinose 9 With longitudinal white lines through basal cell Ri and Rs, basal radial and 1st M2 (Fig. 2b); 5th tergum of <$ and 6th in $ polished black, the latter 2* longer than 5. Irian java albolineata n. sp. Vol. 25, March 1,1985 61 9(8). Cell Ri with 1 narrow and 1 broad brown band; apex of cell Rs hyaline except for brown rays along apices of veins R.4.5 and Mi*2 (Hardy, 1974:213, Fig. 121a). Philippines brachycera Cell Ri with 2 narrow brown rays and with 2 in R3; Rs with a short incomplete brown ray in middle at apex and with converging rays not extending along veins R4.J and Mi*2 (Fig. 3c). Philippines, Sabah, Java convergens Genus Schistopterum Becker Schistopterum Becker, 1903, Mitt. Zool. Mus. Berlin 2:137. Type-species, moebiusi Becker. Differentiated from Rhabdochaela by having veins R4+3 and M|.2 widely diverg ing at apices; vein R20 ending at middle of wing and 4th costal section unusually short, about xh as long as Sth; vein Ri ending just beyond apex of vein Sc, the 2 scarcely separated at apices so cell Sc is extremely narrow, scarcely discernible; only 4 brown rays in wing, and none in apical portion; head with frontal bristles not modified and only ocellar, postocellar and outer vertical bristles flat and white; lacking interfrontal bristles; ocellar bristles small, and arising in triangle slightly posterior to median ocellus; palpi broad, expanded and not fringed with short black setae and prescutellar bristles normal in position, situated opposite postalars. Three known species, 1 widespread over Africa and Israel, 1 from Kenya and 1 from Papua New Guinea. Biology. The larvae infest the flowerheads of Compositae. For a more detailed discussion of the genus and key to known species refer to Hardy (1982). Schistopterum ismayi Hardy Fig. 1 Schistopterum ismayi Hardy, 1982, Proc. Hawaii. Entomol. Soc., 24:88. Type- locality: 27 km SE Port Moresby, Papua New-Guinea. Type $ in BPBM. Differentiated from other known species of the genus by having the clypeus black; the Y-shaped mark in apical portion of wing with a broad stem, extending through upper portion of cell 1st M2; by having only 5-6 small hyaline spots in posterobasal portion of wing (Fig. 1) and spur at apex of mid tibia dark brown to black rather than pale brownish yellow. For more descriptive details and figure of head and $ and $ reproductive structures refer to Hardy (1982). Distribution. Papua New Guinea. Specimens examined. Type-series. Pararhabdochaeta n. genus Differing from Rhabdochaela by having the 3rd antenna! segment short, about as wide as long; arista bare or only microscopically pubescent; no interfrontal bristles; palpi lacking flat black scalelike setae along posterodorsal and posteroven- tral margins; upper inferior fronto-orbital bristles normal in shape, not broad and flattened; front femur with a row of 6-11 short, black, preapical, posteroventral spinules; prescutellar bristles approximately in line with dorsocentrals; apical scutel- lars moderately developed and with a pair of small white dorsal bristles situated near middle of disc; cleft in costa at end of vein Sc less distinct and with less prominent lobe than in Rhabdochaeta; vein Mi.2 only slightly convex beyond m crossvein, and 62 Proceedings, Hawaiian Entomological Society FIGURE 1. Schistopterum ismayi Hardy, wing. FIGURE 2. Pararhabdochaeta albolineata n. sp.: a, head; b, wing. cell Cu terminating in a short acute lobe at lower apex (Fig. 2b). Otherwise fitting characteristics of Rhabdochaeta. Type of genus Rhabdochaeta convergens Hardy. Three known species. The generic epithet is from the Greek para, equals by or near, combined with Rhabdochaeta. Pararhabdochaeta albolineata n. sp. Fig. 2a-b Readily differentiated from other known species by having white longitudinal lines extending through basal cells Ri, R3, basal radial and cell 1st M2; by having a complete brown band through middle of cell Sc and other details of wing markings as in Fig. 2b; by having brown spots at bases of dorsocentral and prescutellar bristles; Sth tergum of 3 and 6th of $ polished black with the latter 2* longer than Sth segment <J. Head- Shaped as in Fig. 2a. With 2 pairs moderately strong, yellow-brown, inferior fronto-orbital bristles and 2 pairs rather small, erect, white bristles situated side by side, arranged transverely in line with upper basal margins of antennae; latter represent lower inferior fronto-orbital with 1st bristle slightly displaced.