Tricella n. gen.

Figs. 13–25

Type species Tricella antonellae n. sp.

Description. Head (Fig. 13) as wide as pronotum. Crown fore margin weakly produced, broadly rounded apically, slightly longer than width between eyes, posterior margin not elevated above pronotum. Coronal suture incomplete, not reaching crown apex.Ocelli absent. Face depressed in profile less than 45° from horizontal. Frontoclypeus flat. Anteclypeus narrow, flat; tapered distally; not sexually dimorphic. Lorum separated from genal margin, relatively broad. Rostrum extended slightly beyond front trochanters.

Thorax. Mesepisternum divided by suture into anepisternum and katepisternum.

Forewing (Fig. 14) apex rounded with three apical cells; veins R, M and Cu fused, forming common stem at base of central apical cell; inner and outer apical cells large and extended to wing apex, central apical cell smaller and semi-ovoid. Hind wing (Fig.15) apex broadly rounded; submarginal vein present, extending around wing apex beyond the apex of vein R+M, CuA and MP (M3+4) confluent for short distance preapically; vannal vein unbranched.

Front femur with AM1 seta enlarged, on ventral margin; AV row with one basal seta distinctly larger than others; PV row without fine basal setae. Hind femur macrosetae 2+1; tibia row AV row with 4 macrosetae.

Abdomen. 2S apodemes (Fig. 16) well developed, not reaching sternite IV; distinctly divergent.

Male genitalia. Pygofer (Fig. 17) with dorsal emargination shallow not extended half way to base of segment; dorsal appendage present. Subgenital plate (Fig. 18) extended beyond apex of pygofer; in ventral view, with angulate basolateral projection; in lateral view, abruptly bent dorsad distally; with oblique row of few macrosetae near middle. Style (Fig. 19) apophysis as long as apodeme; preapical lobe prominent; apex tapered.Aedeagus (Figs. 20–21) without preatrium; dorsal apodeme long, columnar; shaft symmetrical, in lateral view curved dorsad, very short; basal process arising from ventral margin of base of atrial rim; gonopore apical. Aedeagus-connective articulation terminal. Connective (Fig. 22) V shaped.

Female terminalia. Abdominal sternite VII (Fig. 23) with short, acute median posterior lobe and pair of shorter lateral lobes. Pygofer, in lateral view, ovoid with 6 macrosetae in row on caudo-ventral margin. Second valvula (Fig. 24–25) slender, large valve (Fig. 24) with 11–13 strong teeth each with 2 to 4 denticles, apex with small teeth, small valve (Fig. 25) with slightly serrated dorsal margin.

Etymology. The genus name, a feminine noun, was chosen to indicate the three apical cells in forewing.

Notes. This genus closely resembles Donidea Young in the form and chaetotaxy of the pygofer and the shape of the style, but differs in the forewing venation and chaetotaxy of the male subgenital plate: Donidea has veins R, M and Cu separate basad of the apical cells and the subgenital plate has a double row of macrosetae.