Chen Ng(Pg61-69)
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- Bu səhifədəki naviqasiya:
- Measurements.
- Distribution and seasonal occurrence.
330 Shamshev & Grootaert: A review of the genus Stilpon from the Oriental region upper lobe (Fig. 43) undivided, with markedly developed surstylar comb. Right surstylus (Fig. 44) moderately large, sublinear, more or less rounded at apex, lacking spines. Left cercus unbranched, digitiform, fairly long, lacking spines, with 1 strong ventral bristle in middle part and 1 thinner marginal bristle basally. Right cercus consisting of two lobes, lacking spines; left lobe elongate, somewhat broadened toward apex; right lobe short, tapered toward apex. Phallus long, hair-like, curved.
1.2 mm.
Etymology. – “Khorng” (curved) “keun” (upwards) refers to the fact that the vein r4+5 is strongly curved upward. Phylogenetic relationships. – The relationships of this species are unresolved beyond inclusion within the S. divergens group. Presumably the sister species to S. lekkwar based on the presence of apical spines on the middle part of the male left surstylus.
known from one locality in Northeast Thailand in the Loei province. Records are from April till June and one more record in September. Stilpon lek, new species (Figs. 45-49) Material examined. – Holotype - male, THAILAND: Loei province, Na Haeo, near waterfall at FIRS, sample n ° 20013, 23 May.2000, coll. P. Grootaert (SWU). Paratypes – 1 male, same locality as in holotype, sample n ° 98064,
23.V.1998, coll. P. Grootaert; 2 females, same data as in holotype; 2 males, 1 female, Na Haeo, near stream at FIRS, sample n ° 2026,
27 May.2000, coll. P. Grootaert; 1 male, Na Haeo, near stream on mud banks at FIRS, sample n ° 21035, 6 May.2001, coll. P. Grootaert; 1 male, 2 females, Na Haeo, FIRS Malaise trap, 18-25 Dec.2001, coll. P. Grootaert; 1 male, 1 female, same locality as in holotype, sample n ° 21033, 6 May.2001, coll. P. Grootaert. (SWU, RBINS, ZRC) .
Male: mid femur with 1 short black anteroventral spine just beyond middle, abdomen with gland-like structures between tergites 4-3 and 3-2. Halter contrastingly black.
minute anterior ocellars, somewhat longer posterior ocellars and long, cruciate inner verticals. Antenna yellow. Postpedicel nearly 2.0 times longer than wide. Style about 5 times longer than postpedicel. Palpus brownish yellow, small, subtriangular. Figs. 45-49. Stilpon lek, new species, male. 45, mid leg, anterior view, 46, wing, dorsal view, 47, hypopygium, ventral view, 48, left surstylus, dorsal view, 49, right surstylus, dorsal view; v br – ventral bristle. Scale bar: 0.1 mm. 331 THE RAFFLES BULLETIN OF ZOOLOGY 2004 Thorax wholly dark brown. Scutum entirely tomentose. Postpronotal bristle long, black, inclinate. Dorsocentrals in multiple rows, complete posteriorly. Acrostichals 2-serial, complete posteriorly. Legs with colour pattern: hind femur in apical 2/3 yellowish brown to brownish, fore tarsomere 5 dark brown, mid and hind tarsomere 5 pale brown; in darker specimens mid and hind coxae, mid and hind tibiae and mid femur at apex with brownish tinge. Hind trochanter lacking spines. Mid femur (Fig. 45) with 4 yellowish ventral bristles in basal half and 1 short black anteroventral spine just beyond middle. Hind femur (viewed laterally) evenly thickened toward middle; with row of 5 long anteroventral bristles in apical part and some prominent dorsal bristles. Fore tibia lacking prominent bristles. Mid tibia with rows of ventral spinules in apical half and 1 longer subapical spinule. Hind tibia unmodified. Wing (Fig. 46) normally developed, covered with uniform microtrichia; almost uniformly infuscate, somewhat paler along posterior margin. Costal vein with ordinary short setulae on anterior margin. Vein R2+3 about 3 times longer than Rs. Distance between apices of veins R2+3 and R4+5 about 1.3 times longer than distance between apices of veins R1 and R2+3. R4+5 and M divergent and evenly arcuate in apical part. Halter with contrast black, elongate knob and pale yellow stem.
Abdomen largely pale brown, with segments (except segment 8) weakly sclerotized, segment 8 wholly brown. Segments 1-2 unmodified. Narrow gland-like structures present between tergites 4-3 and 3-2 (Fig. 80). Tergites 3 and 4 shortened. Almost all tergites with scattered minute brownish setulae, tergites 7 and 8 with moderately long bristles. Sternites with similar setation but sternites 3 and 4 bearing 1 pair of inclinate bristles. Hypopygium (Fig. 47) dark brown. Hypandrium with 2 strong bristles in apical part. Epandrium completely divided. Left epandrial lamella small, fused to hypandrium, bearing 2 short bristles in apical part. Left surstylus with upper lobe (Fig. 48) undivided, broadened toward apex, with markedly developed surstylar comb. Right surstylus (Fig. 49) rather small, rounded apically, sublinear, lacking spines. Left cercus unbranched, elongate, digitiform, lacking spines, with 1 long ventral bristle in middle part and several shorter marginal bristles basally. Right cercus consisting of two lobes, lacking spines; left lobe elongate, digitiform, somewhat broadened toward apex; right lobe small, rounded, with 2 long apical bristles. Phallus long, hair-like, curved.
5 pale brown, mid and hind tarsomere 5 pale yellow. Mid femur with yellowish ventral bristles only. Mid tibia lacking spinules. Halter with pale brownish knob. Abdomen lacking gland-like structures. Terminalia elongate. Segment 8 stronger sclerotized than preabdomen. Proximal margin of sternite 8 without 2 anteriorly directed rods. Apex of sternite 8 not partially separated from base. Sternite 10 uniformly sclerotized, not fused with ventroapical margin of tergite 8. Cercus elongate oval, brownish yellow, clothed in setulae of different length.
1.2 mm.
Etymology. – “Lek” means small in Thai and it refers to the small size of the species Phylogenetic relationships. – The relationships of this species are unresolved beyond inclusion within the S. divergens group.
from one locality in Northeast Thailand. Records mainly in May, but one record also in December.
(Figs. 50-53) Material examined. – Holotype - male, THAILAND: Loei province, Na Haeo, near waterfall at FIRS, sample n ° 20013, 23 May.2000, coll. P. Grootaert (coll. RBINS). Paratypes – 1 male, 17-24 Jun.2001; 2 males, 17-24.IX.99; 1 female, 29 Apr.2001-6 May.2000; 1 female, 8-15 Apr.2001; 1 male, 30 Apr.-7 May.2000; 1 male, 1 female, 7-14 May.2000, same locality as in holotype, coll. P. Grootaert. 2 males, Khring Nam Tok, sample n ° 23041, 20 May.2003, coll. P. Grootaert; 1 male, Na Haeo FIRS, Malaise trap n ° 2 in bamboo wood, 24 Apr.2003 (leg. P. Grootaert). (SWU, RBINS, ZRC). Diagnosis. – Species with black thorax, very similar to S. lek but somewhat smaller, hind femur entirely yellow, male abdomen with gland-like structures between tergites 5-4, 4- 3 and 3-2. Halter pale brown. Description. – Male. Head black in ground-colour, with minute anterior ocellars, somewhat longer posterior ocellars and long, cruciate inner verticals. Antenna yellow. Postpedicel nearly 2.0 times longer than wide. Style about 5 times longer than postpedicel. Palpus brownish yellow. Thorax wholly dark brown. Scutum entirely tomentose. Postpronotal bristle long, black, inclinate. Dorsocentrals in multiple rows, complete posteriorly. Acrostichals 2-serial, complete posteriorly. Legs with fore tarsomere 5 blackish brown, mid and hind tarsomere 5 pale brown; otherwise legs yellow. Hind trochanter lacking spinules. Mid femur (Fig. 50) with row of 4 brownish yellow bristles in basal 1/3, bearing 1 antero- and 1 posteroventral short spines just beyond middle. Hind femur (viewed laterally) evenly thickened toward middle; with 6- 7 long anteroventral and some prominent dorsal bristles. Fore tibia lacking prominent bristles. Mid tibia with rows of ventral spinules in apical half and 1 longer subapical spinule. Hind tibia unmodified.
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