Amblypsilopus pulverulentus ( Parent, 1939 )

Bickel, Daniel J., 2019, The Amblypsilopus amnoni and megastoma groups in New Guinea (Diptera: Dolichopodidae: Sciapodinae), Israel Journal of Entomology (Oxford, England) 49 (2), pp. 195-214 : 207-208

Amblypsilopus pulverulentus ( Parent, 1939)

( Fig. 13)

Chrysosoma pulverulentum Parent, 1939: 162 .

Amblypsilopus pulverulentus (Parent) : Bickel 1994: 288.

Redescription: Male. Length 5.0 mm.

Similar to A. amnoni except as noted:

Head. [Antenna mostly yellow with dark brown arista.]

Legs. CI, all trochanters, femora, tibiae and basal tarsomeres yellow, with distal tarsomeres becoming infuscated, and as noted below; CII and CIII yellow but infuscated laterally; legs with short black vestiture; [TI slightly flattened dorsoventrally and with pale posterior seta before apex; tarsUs very long and narrow, T2 ⅓× as long as TI, and It 1 twice the length of distal tarsus; It 5 slightly flattened and expanded]; II: 6.5, 10.0, 9.0/2.0/1.3/0.7/0.4; FII with short subapical pv seta; TII with short ad setae at ⅒, ¼, ½ and ¾, and with shorter pd at ⅒, ⅓, ½ and ¾, with apical corona of ad, av, pv and dorsal setae at ⅘; III: 7.5, 14.5, 5.8/2.1/1.5/0.8/0.4; TIII with strong ad at ⅛, short av setae, 4 short spaced anterior setae along distal two-thirds, 5 spaced short dorsal seta along length, and with corona of short ad, av and pv setae; IIIt 1 with pair of short ventral setae near base.

Wing. [Hyaline, but with brownish infuscation in distal quarter of wing.]

Abdomen. Tergite 1 metallic blue-green yellowish medially; tergite 2 mostly yellow, but metallic blue-green anteriorly near tergal overlap; tergites 2–6 mostly metallic blue green, but yellow ventrally; preabdomen with short black vestiture and longer setae near posterior tergal margins; tergite 7 and sternite 8 brown; hypopygium ( Fig. 13) almost entirely yellow with basal hypandrium infuscated; epandrium tapering triangular; surstylus elongate, curved and digitiform, longer than epandrium; cercus with basal triangular projection from which elongate arm diverges at right angles, and with fine yellow hairs.

Female. Unknown.

Holotype (examined): ♂ Papua New Guinea: Edie Creek [Morobe Province, approx. 1100 m], F.H. Taylor ( ANIC). The species was described from a single male. The male holotype is badly damaged, missing the wings, head and leg I. However, the hypopygium is present and diagnostic for this species. The redescription above is based on the damaged holotype, with some additional details in brackets, translated from the French description.

Remarks: Amblypsilopus pulverulentus is known only from Edie Creek, Morobe Province, Papua New Guinea, not far from Wau. The cercus ( Fig. 13) is diagnostic with a basal triangular projection, from which an elongate arm diverges at right angles. The male leg I has the tibia slightly flattened dorsoventrally, an elongate tarsus, more than twice the length of the tibia, and tarsomere 5 flattened and expanded. The wing is unusual in having a brownish infuscation in the distal quarter of the wing.