Triphleba brevicostalis, DISNEY, 2020

DISNEY, R. Henry L., 2020, Scuttle flies (Diptera: Phoridae) from the canopies of ash trees in Norway, with six new species, Fragmenta Faunistica 63 (1), pp. 29-45 : 42-44

Triphleba brevicostalis n. sp.

( Figs 66–76 )

Diagnosis (female). The unforked vein 3 places this in the group of species previously assigned to the separate genus Citrago Sccmitz. Schmitz (1949) . Delage & Lauraire (1970) and Disney (1994) cover the males of the European species. Most are only known from the males. The costal index being clearly less than 0.50 immediately distinguishes this species from the rest of this species group.

Female. Frons as Fig. 66 . Palps and proboscis as Fig. 67 . Postpedicels dark brown and their lengths and breadths subequal (at about 0.11 mm). Side of thorax as Fig. 68 . Scutellum with an anterior pair of minute hairs and a posterior pair of long bristles. Abdominal tergites brown with small hairs ( Fig. 69 ). Venter brown with hairs at rear of segment 6. Sternite 7 is seemingly absent ( Fig. 70 ). Furca as Fig. 71 . Sternum 8 and cerci as Fig. 72 . The legs pale brown to yellowish. Front legs as Fig. 73 , the tibia lacking an anterodorsal bristle. Mid tibia as Fig. 74 , with one anterodorsal and 2 dorsal bristles. Hind femur and tibia as Fig. 75 , the tibia with 1 anterodorsal bristle. The pale wing ( Fig. 76 ) 1.70 mm long and with the costal index 0.44 and vein 3 lacking the anterior fork (vein 2) and costal section 1 is only slightly longer than 2 (1.05: 1). Vein 7 not discernible. Halrtere brown ( Fig. 68 ).

Material. Holotype, female, Norway, Sogn & Fjord: Stryn , 61.8605º N, 6.3404º E, 15 Jul 2018, J. Svetlik & L. Børjia (11, UCMZ, 39–93).

Etymology. Named after the short costal index.

Figures

Figs 66–71. Triphleba brevicostalis female. 66 - frons; 67 - palps and proboscis; 68 - side of thorax; 69, abdominal tergites 5 and 6; 70 – sternum 7; 71 – furca.

Figs 72–76. Triphleba brevicostalis female. 72 – sternum 8 and cerci; 73 – front leg; 74 – mid tibia; 75 – hind femur and tibia; 76 – wing.