Myriophora hebes sp. nov.

(Figs 4.4, 11.4, 17.4)

Diagnosis. Female. Myriophora hebes is differentiated from most Myriophora by the short A1 + CUA2 vein that ends well before the wing margin (Fig. 11.4). One other species, M. alienipennis, has similar wing venation, but M. hebes possesses an oviscape tergite with a blunted apex, nearly rectangular abdominal T6, and lighter abdominal tergites.

Description. Female (Fig. 4.4). Body length 2.38 mm. Head: Frons dusky yellow, with 1 pair of supraantennal setae; supra-antennals originate above lower interfrontal setae. First flagellomere yellow, slightly pointed under arista. Palpus yellow, normal sized. Labrum prominent, enlarged. Labellum normal sized. Thorax: Scutum dusky yellow. Scutellum dusky yellow. Anterior scutellar setae about 3/4 length of the posterior pair. Pleuron yellow; anepisternum with a few setulae. Forefemur yellow. Midfemur yellow. Hind femur yellow. Wing length 1.89 mm (Fig. 11.4); costal vein inflated; costal length 1.16 mm; costal ratio 0.61. Knob of halter light brown. Abdomen: Tergites 1 and 2 contrasting, yellow anteriorly, brown posteriorly; tergite 2 with strong, distinct setae on lateral margin. Tergite 5 contrasting, yellow anteriorly, brown posteriorly; posterior setae on tergite 5 short. Tergite 6 rectangular to slightly narrowing posteriorly; posterodorsal setae on segment 6 shorter than posteroventral setae. Venter of abdomen with dense, short setae. Oviscape (Fig. 17.4) apex yellow with brown margin, weakly laterally compressed; apex of tergite blunt; membrane lightly colored with distinct brown striae.

Distribution. Known from a single site in Colombia.

Host. Unknown.

Etymology. An adjective from Latin for "blunt" referring to the blunt apex of the oviscape tergite.

Holotype. ♀, COLOMBIA: Vichada: PNN El Tuparro, Centro Ad., 5.35°N, 67.86°W, 140m, 29.vi– 15.vii.2000, W. Villalba, CAP-269, Malaise trap [LACM ENT 180356] (IAVH).

Paratypes. 1♀, COLOMBIA: Vichada: PNN El Tuparro, Centro Ad., 5.35°N, 67.86°W, 140m, 19– 29.vi.2000, W. Villalba, CAP-268, Malaise trap #17 [LACM ENT 129163].