Silba foldvarii, Introduction & Fallén & Morge, 2007

Introduction, Iain, Fallén, Lonchaea & Morge, Setisquamalonchaea, 2007, New pecies of Lonchaeidae (Diptera: Schizophora) from Asia, Zootaxa 1631, pp. 1-32 : 21

Silba foldvarii sp. nov.

Description: Holotype male: Head: Eyes bare. Frons at narrowest point one third eye width, dull black and covered in microsculpture, bearing very short setulae. Orbital plate long and narrow, brightly shining black and without setulae. Lunule with brownish ground colour but covered in silver dusting, bearing four setulae. Upper face and parafacials slightly silvered. Anterior genal setulae in a single row of four or five along the mouth margin, none of these exceptionally strong. Antennal flagellomere entirelly black, two and a half times as long as deep. Arista black with long plumosity which at its greatest extent is one and a half times the depth of the flagellomere.

Thorax: disc brightly shining black, covered with short setulae at most one quarter the length of orbital setae, thoracic sclerites rather grey-metallic dusted. Anepisternum with two anterior and three posterior strong setae. Katepisternum with two strong setae, anterior one rather weaker than the posterior, no setulae posterior or ventral to these. One propleural and one stigmatical setae which is as long as the propleural but only half its width. Scutellum with disc dusted grey-metallic, on margin with two setulae on each side between apical and lateral setae, two tiny setulae between apical setae. Squamae and margins pale, with long light-golden fringes. Wings uniformly light fumose. Wing length 3.7mm. Legs, entirely black.

Male terminalia; Figs. 42–44. In lateral view epandrium one and a half times as high as wide, apically with a small semi-circular excavation on the dorsal margin, bearing a row of well spaced moderately long setulae along the posteroventral and ventral margins. Cerci approximately one third the height of the epandrium, bluntly pointed, sclerotised apically and bearing a fringe of setulae. Surstyli visible outside the shell of the epandrium as a rather blunt and rounded posteroventral process. In ventral view surstyli with a row of six small black basally, below cerci on each side with one small fine setulae. Aedeagus J-shaped, a thin a narrow curve but with a characteristic flared section just before the apex.

Differential diagnosis: there are several south-east Asian Silba species with the combination of pale squamal fringes and all black legs. The most obvious feature of this species is the long, thin aedeagus with the widened section just before the apex. This type of slender aedeagus is also found in the widespread S. perplexa (Walker, 1861) but in that species there is no flared area apically, instead the apex is angled to the main shaft.

TYPE MATERIAL: Holotype male. THAILAND: Nan Prov., Mae Charim waterfall, No.25, over and along rivulet 7–8.xi.04. Papp & Földvári.

Paratypes. 1 male with the same data as the holotype. Tham Sakoen N. P., No. 17, 26.ix.2003, 19°23’N 100°36’E, over and along creek in forest, leg. Földvári and Szappanos , 1 male.

Holotype and paratypes in the HNHM .

Etymology. This specific epithet refers to Mihály Földvári who, with László Papp, captured the holotype