Ischiodon astales Mengual, 2018:60

Females and males of this new species do not have a calcar on the metatrochanter and they are easy to distinguish from other species since the two broad, yellow maculae on tergite 2 do not reach the lateral margins (Figs 2A, C, 3A, C). Moreover, males of I. astales sp. n. have symmetrical claws on the fore leg, the same as males of I. scutellaris.

Male: Head (Fig. 2A, B): Face with distinct facial tubercle, entirely yellow, yellow pilose; gena yellow with two small black macula at eye margin; lunule yellow; frons yellow, yellow pilose; vertical triangle black; antenna yellow, black pilose, basoflagellomere orange, darker dorsally; arista orange-yellow, bare; eye bare; occiput black, white pollinose and white pilose on ventral 1/2, yellow pollinose and yellow pilose on dorsal 1/2. Thorax (Fig. 2A, C): Scutum shiny black, with long yellow pile; postpronotum paler, brownish, bare; notopleuron and supra-alar area yellow; postalar callus darker, brownish; scutellum yellow with medial area brownish, yellow pilose, subscutellar fringe yellow. Pleuron black, except posterior anepisternum yellow on posterior 1/2 and katepisternum with a dorsal yellow macula, yellow pilose; katepisternal pile patch- es separated; metaepisternum bare; metasternum bare; postmetacoxal bridge incom- plete; calypter yellow, yellow pilose; plumula long, pale; halter pedicel and capitulum yellow; posterior spiracular fringes yellow. Wing: hyaline, bare on basal 1/2 and with sparse and irregularly scattered microtrichia on apical 1/2; alula mostly bare, with a few microtrichia posteriorly. Legs: fore and mid legs yellow with femora slightly more orange, coxae black and basal 1/2 of trochanters dark, entirely yellow pilose; hind leg with black coxae and basal part of trochanter dark; yellow metafemur with an almost imperceptible brown area on the apical 1/2, and metatibia slightly darker (dark yellow) on apical 1/2, black and yellow pilose. Abdomen (Fig. 2A, C): Parallel-sided, with lateral margin from apical 1/2 of tergite 2 to tergite 5. Tergite 1 black, except yellow on lateral margins, yellow pilose; tergite 2 black, paler medially on posterior margin, with two large, rounded yellow maculae that do not reach lateral margins, yellow pilose, with short black pile on posterior mar- gin; tergite 3 black on basal 1/2 becoming orange or brownish on posterior 1/2, with a medial yellow fascia that does not reach the lateral margins, with scattered, short, black pile; tergite 4 brownish-orange with a medial yellow fascia, black pilose except on the yellow fascia; tergite 5 brownish-orange, black pilose. Sternite 1 yellow; sternite 2 yellow with a medial, round, black macula; sterna 3 and 4 yellow becoming darker (brownish orange) towards genitalia; all sterna with yellow pile. Male genitalia: large, brownish-orange, as in Fig. 2E, F. Female: Similar to male except for normal sexual dimorphism and as follows: frons black on dorsal 1/3, yellow on ventral 2/3 with a variable medial brownish orange vitta. Variation: Due to the small number of specimens, one must expect variability in the coloration of the abdomen, legs and female frons, as in other Ischiodon species. Length (N=4): Body, 10.0 mm (9.0–12.0 mm); wing, 7.7 mm (7.5–8.0 mm).

Bastiaan Wakkie