A Review Of The Genus Stilpon Loew, 1859 (Empidoidea: Hybotidae) From The Oriental Region Author Shamshev, Igor V. Author Grootaert, Patrick text Raffles Bulletin of Zoology 2004 52 2 315 346 journal article 10.5281/zenodo.10081452 2345-7600 FF95FFB4FFB34905FFE32A54FFD7FFC1 10081452 Stilpon lekkwar , new species ( 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. Wing normally developed, covered with uniform microtrichia; almost uniformly infuscate, somewhat paler along posterior margin. Costal vein with ordinary short setulae on anterior margin. Distance between apices of veins R2+3 and R4+5 about 1.5 times longer than distance between apices of veins R1 and R2+3. R4+5 and M divergent and evenly arcuate in apical part. Halter pale, knob with slight brownish tinge. Abdomen with tergites 1-2 unmodified. Narrow gland-like structures present between tergites 5-4, 4-3, and 3-2 ( Fig. 81 ). Tergites 3 and 4 shortened. Segment 8 with short bristles. Hypopygium ( Fig. 51 ) dark brown. Hypandrium with 2 long bristles in apical part. Epandrium completely divided. Left epandrial lamella small, fused to hypandrium, bearing 2 long bristles in apical part. Left surstylus with upper lobe ( Fig. 52 ) undivided, with markedly developed surstylar comb. Right surstylus ( Fig. 53 ) rather small, rounded apically, lacking spines. Left cercus unbranched, elongate, digitiform, lacking spines, with 1 long, spine-like, ventral bristle in middle part and 3 thinner marginal bristles basally. Right cercus consisting of two lobes, lacking spines; left lobe slender, digitiform; right lobe small, rounded. Phallus long, hair-like, curved. Female . In most respects identical to male. Mid femur with yellowish bristles in basal part, lacking black spines. Mid tibia lacking ventral spinules. 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. Measurements. – Body length 1.2-1.4 mm , wing length 0.8- 0.9 mm . Etymology. – “Lek” (small) “kwar” (more) refers to the fact that this species is even smaller than its sibling S. lek . Phylogenetic relationships. – The relationships of this species are unresolved beyond inclusion within the S. divergens group. Distribution and seasonal occurrence. – Thailand . Known from one locality in Northeast Thailand only. Records from April, May and June, but one record also from September.