Petrothrincus andring, new species

Figs 25–27, 44–46, 59

This new species is close to P. scottae, but differs in having the superior appendages more slender and oriented upward, the shape of the IXth segment and Xth tergum in both lateral and dorsal views, the gonocoxite with a deeper apical incision, and phallic sclerites absent.

Male head and thorax (Figs 25–27). Antennal scape about 4x as long as wide (Fig. 25). Maxillary palp apparently 6­segmented, segmentation or articulations of 3rd segment not clear (see remarks below). 1st segment shortest, 2nd, 4th and 5th of about equal length, 3rd broadened by 2.5x, bearing a tuft of long modified setae and seems subdivided by false joint centrally on wide part (Figs 26–27). Interantennal setal warts tangential to each other, cephalic setal warts broad reniform, postocular warts small, oval, present dorsally on head. Pronotum with 2 pairs of setal warts, median pair of warts egg­shaped, about 2x longer and wider than lateral setal warts.

Male wings. Forewing length 4.5 mm, hind wing length 3.4 mm. Denuded wing membrane pale with pale flavous veins. Venation typical, except discoidal cell nearly 3x longer than wide. Subcosta and particularly radius on forewing and subcosta on hind wing strongly thickened. Thickening also present on M3+4, Cu1 and A 1 in forewing. Pterostigmal area strongly enlarged and well pigmented.

Male genitalia (Figs 44–46). Anterior margin of segment IX with anterior lobe ellipsoid; posterior margin broadly incised at ventral part, dorsal part produced posterodorsally (Fig. 44), IXth tergum H­shaped in dorsal aspect (Fig. 45). Sternum short and directed posteriorly in lateral aspect (Fig. 44). Superior appendage long finger­like in lateral view (Fig. 44), directed upward, with widely triangular ventral protuberance at 1/3; in dorsal view closely adpressed at base, divergent distally (Fig. 45). Xth tergum lanceolate in lateral view (Fig. 44); in dorsal view (Fig. 45) basally narrow, at midway expanded laterally into pair of triangular processes, apex with short, wide apical lobe armed with 2 small setae. Gonocoxite long, directed posterodorsally, strongly excised into 3 long, slender lobes at distal 3rd; in ventral view (Fig. 45) median margin irregularly serrated, apex curved inward. Phallic guide forms 1 pair of elongate, slender up­curving rods (Fig. 44); in ventral view (Fig. 46) adpressed and parallel between gonocoxites. Phallus basal half about 2x broader than distal half in lateral view (Fig. 44), slightly bent posteriorly at midway, without phallic sclerites.

Etymology. Name derived from the local name for the type locality of this interesting species.

Holotype male: MADAGASCAR: Andringitra, Soanindrano, 2070 m, 15.i 1958 [collector unknown].

Remarks. The maxillary palps appear to comprise 6 segments probably due to subdivision of segment 3 into a broad basal part and a slender distal part.