Syndyas elongata de Meijere, 1910

Grootaert, Patrick & Yang, Ding, 2009, A New Syndyas Loew, 1857 (Diptera: Hybotidae: Hybotinae) From Mangroves In Singapore, With A Review Of The Oriental And Australasian Species, Raffles Bulletin of Zoology 57 (1), pp. 17-24 : 20-21

Syndyas elongata de Meijere, 1910

( Figs. 4 , 7 , 12 )

Syndyas elongata de Meijere, 1910: 67 , Fig. 4 (wing).

Material examined. – Lectotype male(designated here) INDONESIA [E. Jacobson. Verlaten Eiland Krakatau Mei 1908] white label in long hand [ Syndyas elongata det. de Meijere Type] red label [ Syndyas elongata de Meijere 1910 ZMAN type DIPT.0478.1]; 3 females, same provenance as lectotype. 1 female [E. Jacobson Batavia Sept 1908]; 1 male, 1 female [Java Jacobson]. The latter specimens are probably from Tandjong Priok near Batavia, November, Jacobson leg as mentioned in de Meijere (1910), but there is nothing additional on the label.

Diagnosis. Slender species with long slender abdomen and wings. Wing clear with a faint yellowish stigma. Discal cell a little shorter than basal cells. Mesonotum shining black with a bluish tinge.

Redescription. – Male: length: 3.5 mm; wing: 2.5 mm.

Head. Eyes holoptic, frons and face linear. A pair of proclinate ocellars as long as all antennal segments together. Postoculars long above, black, with tips proclinate over the eye. Antenna black, third segment elliptical 2.5 times as long as wide. Arista at least 3 times as long as all antennal segments combined. Palp and proboscis hidden.

Fore tibia ( Fig. 7 ) dorsoventrally curved, only a little thickened; gland opening a little prominent, with a row of very long pale posteroventral bristles. Hind femur very slender on basal 2/3, only swollen on apical third ( Fig. 12 ). Ventrally a row of fine bristles a little longer than femur is wide becoming spine-like on apical third (the club-shaped part). Hind tibia thickened on apical half, with at least 3 pairs of long fine dorsal bristles, the preapical pair the longest. Hind tarsomere 1 thickened and a little longer than following tarsomeres together.

Mesonotum shining black, viewed from behind with a greenish blue metallic shine. Posterior third of mesonotum covered by thin brown dusting. Pleura with the usual thin brown dusting and so only subshining. Scutellum with a pair of brown apical bristles and at least 2 hairs at each side.

Wing ( Fig. 4 ) clear with a faint yellowish stigma. Veins brown. Discal cell a little shorter than basal cells. Squama black with very long, pale cilia. Halter black.

Abdomen long and slender, covered with short black hairs, even at base of basal segments. Genitalia as wide as abdomen.

Female: length: 3.2–3.7 mm; wing: 2.4–2.5 mm. Identical in most respects to male.

Comments. – The male from Krakatau was selected as lectotype not only because its locality was mentioned first in the description, but also because it is a more precise site than Jakarta (Batavia) .

Figures

Figs. 1–4: Syndyas wings: 1, S. singaporensis, new species; 2, S. brevior de Meijere; 3, S. aterrima de Meijere; 4, S. elongata de Meijere.

Figs. 5–8. Syndyas fore tibia posteriorly: 5, S. singaporensis, new species; 6, S. aterrima de Meijere; 7, S. elongata de Meijere; 8, S. brevior de Meijere.

Figs. 9–12. Syndyas hind leg: 9, S. singaporensis new species; 10, S. brevior de Meijere; 11, S. aterrima de Meijere; 12, S. elongata de Meijere.