Quite by accident, I prepared the male genitalia of several specimens of the "most common oriental species", P. All important features, including the armature of the mid-tibia (DEEMING1969: .. fig. 5) and male postabdomen and genitalia, viz. The five species can be distinguished mainly by the male genitalia, but two subgroups of P.
There are minor variations in the fine details of the surstylus between specimens from different localities (Fig. 4 vs. Fig. 5), but I think this is normal. According to DEMEIJERE, both should differ in the degree of dark discoloration of the wing membrane. Of course, the safe distinction is based on the characteristics of the male postabdomen and genitalia.
I have prepared two figures of the male genitalia to facilitate further findings of this. One of the intact males in the Royal Ontario Museum may be designated as the neotype, if the original type specimen is not found in the future (see PAPP. I have further added to the original description, including with five figures of the male postabdomen and genitalia (PAPP1991a: figs 21–25).
I would like to draw attention to the peculiar sclerotization of the phallus, which is also partially depicted in its original description (a thick black line behind the surstylus in fig.
It belongs to a difficult group of species, and since I have not seen specimens from Burma, I think that its occurrence only in Indonesia (Java, Sumatra) and Taiwan is justified. This species appears to be widespread, considering all previous distribution data (HACKMAN1977, PAPP1991a,b). PAPP (1991b) recorded it as new to Sri Lanka, but it is reliably known from Singapore (type locality), India, Indonesia (W. Flores), cf.
DESCRIPTIONS OF THE NEW SPECIES Poecilosomella borborus sp. n
Apical part of surstylus (Fig. 7) caudally with 4 thick black teeth, the size and position of which differ from that of P. Subepandrial sclerite (Fig. 18) peculiar to a pair of sclerotized and black melanized inner processes and with a pair rather long, knotted, rounded, hairy, ventral (outer) processes. Surstylus (Fig. 21) with only 1 large thick black tooth, but no process behind it as inP.
Hypoproct (Fig. 30) divided; segments broadly rounded apically, with short hairs and with 2 pairs of medium-long hair-like setae. Male subepandrial sclerite (Fig. 32) with a pair of acutely pointed straight processes which bear 2 long setae. Distiphallus rather compact, apical thread-like process (Fig. 31) at least three times longer than distiphallus.
Male sternite 6 (Fig. 36) complex in shape with a dark digitiform process medially on the left side. Male surstylus (Fig. 35) with two long, deeply separated lobes, medial lobe long, finger-shaped but blunt. Subepandrian sclerite (Fig. 39) without large ventral projection but with 3 pairs of setae, sclerotization characteristic of the species.
Postgonite (Fig. 40) relatively short, broad, curved along a broad arc, apical part with apically directed small spines. The medial part of the subepandrial sclerite (Fig. 42) is separated, with short black pins but with a limited number of longer hairs. Surstylus (Fig. 43) bilobed, anterior lobe broad with long hairs, posterior lobe narrower but apically rounded, there with a thick black tooth.
Distyphalus narrowing, apical part slightly curved, apical process threadlike about twice as long as phallus (Fig. 46). Male surstylus (Fig. 52) distinct, apical lobes extremely short, me-dial with a relatively short tooth; anterior lobe with many very long setae; basal (caudal) part of surstylus with thick spine-like setae. Postgonite (Fig. 55) relatively short, strongly curved, moderately wide, apical half has dense short hairs.
Fore tibia and basitarsus of male without long hairs, but fore tibia with row of thick medium long black spines ventrally (Fig. 58). Postgonite (Fig. 63) medium wide, with only a few fine hairs (those mostly on medial surface), its apical 1/5 curved, apex obtuse. Male abdominal sternite 5 (Fig. 65) asymmetrical, medial part broadly notched, area between sternite 5 and 6 with long fine hairs arranged in 2 rows.
Subepandrial sclerite (Fig. 66), quite simple with a sagittal groove, partly covered with black spines and with some medium-long bristles, not only marginal.
A KEY TO THE ORIENTAL SPECIES OF POECILOSOMELLA (based on P APP 1991a)
- furcata (D UDA , 1925) 4 (3) Mid tibia with a distinct ventro-apical seta
- annulitibia (D EEMING , 1969) 13 (12) Anterior bristle of mid tibia much nearer to proximal anterodorsal than to
- paraciculata sp. n
- borboroides (W ALKER , 1860) 33 (32) Male surstylus with 4 thick black teeth, ventral process of the subepandrial
- affinis H AYASHI , 2002 63 (60) Male mid tibia with thinner but longer hairs, numerous hairs longer than
- laterally with an extremely long curved, posteriorly directed spine
- rectinervis (D UDA , 1925) 71 (70) Male mid basitarsus with dense black setulae on its whole ventral surface
- peniculifera sp. n
- nigra sp. n
No ventro-apical on the mid-tibia or ventro-apical seta that is much shorter than the sub-apical tibial diameter. Male mid tibia ventrally with a short ventro-apical but with only short bristles (shorter than the tibial diameter). Male mid-tibia and basitarsus ventrally without long hairs, or tibia with a limited number of long hairs.
42 (39) Mid tibia with or without long ventro-apical spur; if present, much shorter than half of the midbasitarsus. Anterior lobe of the surstylus with very long hairs (fig. 49), posterior lobe larger than in P. 51 (52) Middle of the tibia of the male, apically inwardly curved and dorsoventrally flattened, ventrally with medium-long hairs.
Posterior lobe (ventromedial process) of male surstylus (Fig. 67) with an extremely long, strap-like black spine. 57 (66) Male mid tibia ventrally with long hairs, no distinct, strong ventroapical seta but ventroapically at most with a transverse row of more or less curved, longer hairs instead. 66 (57) Male mid tibia ventrally without long hairs, ventroapical seta more or less strong or mid basitarsus modified.
Female mid tibia with two short ventroapicals that are subapically much shorter than tibial diameter.
