Hemerodromia etalutea , Plant, Adrian R., 2015

Plant, Adrian R., 2015, Diversity of Hemerodromia Meigen, 1822 (Diptera: Empididae) in Thailand, the tip of a tropical iceberg?, Zootaxa 4039 (1), pp. 1-56: 26-27

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Hemerodromia etalutea

sp. nov.

Hemerodromia etalutea  sp. nov.

( Figs 37 –39View FIGURES 37 – 39, 84View FIGURES 82 – 90)

Diagnosis. A species with yellow thorax with only sutures about laterotergite blackish. Sct present. Cell bm+dm long. Wing veins entirely yellow. Abdomen with tergite 2 yellow. Epandrium strongly concave on dorsal margin.

Description. Male: Body length 2.6 –3.0 mm; wing length 2.5 mm. Head. Black, dusted greyish; frons paler, brownish in front of ocelli, becoming whitish near base of antenna; antenna and mouthparts pale whitish yellow, all setae pale; one pair proclinate ocl; postocular setae uniseriate, merging above with ~ 1–2 pairs small vtl and several fine setulae on vertex; frontal setulae apparently absent. Antenna with postpedicel ~ 2.5 –3.0X long as wide, a few minute outstanding setulae subapically; stylus shorter, ~ 0.4–0.45 X long as postpedicel; scape with distinct fine dorsal seta. Thorax. Dusted greyish. Ground colour clear yellow including mediotergite and prothoracic ‘collar’; only sutures about laterotergite blackish. All setae yellowish; minute apart from a pair of distinct sct and one npl. Legs. Pale yellow. C 1 ~ 1.2 X longer than distance between C 1 and C 2, a few distinct setulae dorsally and apically. F 1 ~ 1.2 X long as C 1, ~ 6 X long as wide, evenly inflated, hardly constricted on proximal 0.3; femoral formula ~ 7– 8 / 18–19 / 18–19 + 1–2 / 6–8, denticles black, rows converging apically; spines yellow, pv and av rows rather short, 0.3–0.5 X long as limb is deep, becoming somewhat longer proximally with basal spine of pv row much stronger. T 1 ~ 0.6–0.7 X long as F 1, evenly curved, ventral face shallowly concave; with one row of ~ 15 sharply pointed spinose setae ventrally; ventroapical spur extremely small with strong erect black spinose seta arising from near base; a ciliation of short setulae dorsally on distal 0.3. Mid and hind legs slender with only small pale setulae. Wing. Membrane with yellow microtrichia but hyaline basally. Veins yellow, paler near base of wing. Marginal setulae pale. R 2 + 3 almost linear, joining C ~ 0.6 X distance between end of R 1 and R 4; length of C between ends of R 2 + 3 and R 4 ~ 1.8 –2.0X long as R 4; R 4 slightly S-shaped, angle with R 5 at extreme base ~ 85 °, becoming ~ 70–80 ° thereafter, joining C at ~ 85 °. R 5 ~ 2.0– 2.5 X long as R 4, almost linear; R 4 + 5 fork distal to M 1 + 2 fork by ~ 1 X length of R 4. M 1 slightly curved, convergent distally with R 5; cell bm+dm long, ending beyond tip of R 1. Halter yellowish white. Squama with margin yellowish. Abdomen. Yellow with tergites 3–5 and 8 blackish; tergite 2 sometimes faintly darker medially. Tergite 8 with dark bristly setae on posterior margin; tergite 7 with a few smaller yellow setae on disc. Terminalia. Cercus of complex structure; slightly shorter than epandrium; narrow distally with tip upturned in lateral view ( Fig. 37View FIGURES 37 – 39); 2 small subtriangular dorsal process on proximal 0.5 with a short row of very fine setulae adjacent on outer face ( Figs 37, 38View FIGURES 37 – 39). Epandrium with upper margin distinctly and rather abruptly curved beyond middle; a cluster of 3–4 strong setae apically. Surstylus present, not reaching beyond tip of epandrium; apically inflated with several strong black peg-like modified setae around tip ( Fig. 39View FIGURES 37 – 39). A pale yellowish (almost transparent) dorsoapically pointed process emerging slightly beyond tip of epandrium. Hypandrium small, angular, subquadrate with a few distinct setae proximally. Female: Similar to male; terminalia blackish.

Type material. HOLOTYPE ♂, THAILAND: Nakhon Si Thammarat Province, Namtok Yong NP, TV aerial, 966 m, 8 ° 14.262 'N, 99 ° 48.289 'E, 15–22.x. 2008, MT, Paiboon [T 4226]( QSBG). PARATYPES: 3 ♂, 2 ♀, same data as holotype ( QSBG & NMWC).

Etymology. The specific epithet is a concatenation of the Latin luteus and the seventh letter of the Greek alphabet (eta). It is used as a noun in apposition.

Remarks. Hemerodromia etalutea  sp. nov. can be distinguished from other species with an unmarked yellow scutum by having the mediotergite clear yellow and the wing with both veins and membrane yellow but confirmation of identification requires examination of male terminalia. The species is only known from Nakhon Si Thammarat Province in southern Thailand ( Fig. 84View FIGURES 82 – 90) at mid elevation (966 m) in October.


National Museum of Wales