Campeprosopa borneensis Lindner, 1937

Mason, Franco & Nÿ, Rudolf Rozko Š, 2008, A review of the Oriental Campeprosopa species (Diptera: Stratiomyidae), Zootaxa 1794, pp. 49-64 : 51-52

Campeprosopa borneensis Lindner, 1937

( Figs 1–8 )

Campeprosopa borneensis Lindner, 1937: 350

Type material: The male holotype is housed in BMNH and labelled: Campeprosopa borneensis ɗ BMNH Holotypus, Type Campeprosopa borneensis Lindner [handwriting by E. Lindner in red], Pres. by Imp. Inst. Ent. B. M. 1937-553, Manong, W. Borneo, F. Muir, HOLOTYPE Campeprosopa borneensis Lindner , det. J. E. Chainey 1982, HOLOTYPUS Campeprosopa borneensis Lindner, F. Mason & R. Rozkošný des. 2007. Condition of the holotype: right antenna missing, wings glued; male terminalia in a microvial on the same pin.

Diagnosis: A black and yellow species with the dichoptic head in both sexes. The scutellum is black including posterior margin, each of the scutellar spines is twice as long as scutellum. The hind tibia is black but its basal 1/3–1/2 is bright yellow.

Description: Male. Body length: 8.0– 10.4 mm; wing length: 8.2–10.2 mm. Head ( Figs 1–3 ) black, eyes dichoptic, frontal index 2.7, frons about as wide as anterior ocellus, subshining black, with a bluish shade, very slightly dusted, narrow and deeply black midline usually distinct. Postocular area virtually not distinct. Antennae ( Fig. 5 ) placed on a subantennal protuberance being barely as long as one third of scape. Scape twice as long as pedicel, antennal index 1.7, scape usually black, pedicel and at least basal part of flagellum paler, brown. First to fourth flagellomeres cylindrical, with distinct pale antennal pits (with sensillae). Flagellomeres 5–8 subquadrate, usually without sensory pits, last flagellomere barely longer than broad at base, subconical, conspicuously depressed laterally. Face black, margin of mouth opening paler but epistoma dark, labellum of proboscis bright yellow. Palpus also yellow, barely as long as half length of labellum, two segmented, both segments subequal, first slender and cylindrical, second slightly dilated, lanceolate. Head pile generally inconspicuous, brown, short and appressed on occiput, short and black beyond ocellar triangle, sparse, very short and brown on frons but reduced in front of antennae. Hairs on face longer, semi-appressed and almost white, continuing on a rim along eyes to lower postocular area.

Thorax ( Fig. 4 ) predominantly black with metallic blue reflections, finely punctate. Pronotum deeply brown to black, with an anterior, bright yellow midspot, outer angle of postpronotal callus rounded in dorsal view, yellow to brown. Narrow upper margin of anepisternum usually brown. Scutellar spines strong, often more yellow distally, about twice longer than scutellum in midline. Short, mostly appressed thoracic pile reddish brown with a coppery hue on scutum and scutellum, silvery pale but only locally more dense on pleura though mid-upper part of anepisternum glabrous. Dense and longer pale hairs especially on propleura, laterotergites and upper posterior corner of katepisternum.

Wing ( Fig. 4 ) with blackish microtrichia in distal third, along posterior margin, central area around discal cell and basal third of wing mostly bare and transparent. Pterostigma brown. Costal section between ends of R4 and R5 slightly shorter than that between R2+3 and R4, discal cell relatively narrow, arising of vein M3 closer to M2 than to cubital vein. Calypter only narrow, brownish, halter yellow.

Legs ( Fig. 6 ) mainly orange yellow with all coxae dark brown to black. All femora yellow with apical third (or slightly more) pale brown to dark brown. All tibiae brown with basal third to half yellow, darker on hind tibia. Fore and midtarsi yellow but darkened from beginning of distal third of basitarsi. Hind tarsus bright yellow, last tarsomere black.

Abdomen ( Fig. 4 ) elongated, parallel-sided, tergite 1 black, tergites 2 and 3 yellow, with two subovate to subquadrate pairs of dorsolateral, shining black patches, tergites 4 and 5 black, except for the small yellow corners at lateral margin of abdomen. First sternite black, only with narrow yellow posterior margin, second and third sternites completely yellow, sternite 4 and 5 black. Abdominal pile inconspicuous, black, very short and appressed dorsally and predominantly yellow along lateral margin, in anterior corners and ventrally. Male terminalia similar to those of C. flavipes but medial process of genital capsule ( Fig. 7 ) more slender and pointed, gonostylus likewise dilated in distal half, with a distinct rounded inner lobe and long setae along inner margin. Phallic complex ( Fig. 8 ) virtually of the same shape as in C. flavipes .

Female. Unknown.

Variation. Certain variability was noticed especially in the intensity of leg darkening, the extent of the yellow part on the hind tibia, in the point where vein M3 arising and in the form of abdominal spots on tergites 2 and 3.

Remarks. Campeprosopa borneensis is undoubtedly closely related to C. flavipes . The colouring of the hind tibia seems to be very stable and also the completely yellow hind basitarsus was found only exclusively in a few females of C. flavipes from Sumatra. However, differences found in the shape of the male terminalia appear to be not too significant. Unfortunately, the female of C. borneensis is unknown.

Additional material examined:

E Malaysia: Sabah, Tenompok, 30 miles of Jesselton, 1460 m, 17–21. x.1958 1 ɗ; Bundu Tukan, 18. ii.1959 1 ɗ; both T. C. Maa, in BPBM; 1 km S of Kundasang, 1530 m, 22. viii.1983 3 ɗ, G. F. Hevel & W. E. Steiner, in USNM.

Geographical distribution ( Fig. 44 ): E Malaysia: Sabah (material examined), Sarawak (holotype). The locality of the holotype was interpreted by Lindner as “Manorg“ followed by “W. Borneo“ on the original label and located in Kalimantan by Woodley (2001). Neal L. Evenhuis kindly interpreted this locality as Manong, a stream in Sarawak (3° 46'N, 113°46'E).

Figures

FIGURE 44. Distributional map of the Campeprosopa species: C. borneensis, C. flavipes (some markings in the areas with accumulated collecting sites may represent 3 – 5 closely placed localities), C. longispina.

FIGURES 1 – 8. Campeprosopa borneensis, male. 1. Head in lateral view. 2. Head in frontal view. 3. Left half of head in dorsal view. 4. Body and wing in dorsal view. 5. Antenna. 6. Left hind leg. 7. Genital capsule, 8. Phallic complex. Scales: 1.0 mm (Figs 1 – 6), 0.1 mm (Figs 7 – 8).