Nepalomyia harpago, Grootaert, 2013

Grootaert, Patrick, 2013, New Nepalomyia Hollis (Diptera: Dolichopodidae) From Singapore And South Malaysia, Raffles Bulletin of Zoology 61 (1), pp. 103-116 : 104

Nepalomyia harpago , new species

( Figs. 1 , 2–4 )

Material examined. — Holotype male, MALAYSIA, Endau Rompin , 12 Jul.2001, primary rain forest (MS name: M 66; reg. 21066, coll. P. Grootaert).

Diagnosis. — A small species with third antennal segment twice as long as wide. Arista three times as long as third

The seven species that are found in Singapore and South Peninsular Malaysia are all quite small with a body length varying between 1.7 and 2.1 mm. Body colour is greyish brown, never shining metallic green. They look externally very similar, not exhibiting peculiar secondary sexual characters. There are differences in length and shape of third antennal segment and basal spur on hind basitarsus. Rarely, there is a difference in colour of fore coxa or knob of halter. Sometimes lengths of the marginal bristles of the abdominal terga and sterna are different. However shape and structure of male genitalia are very diverse and specific. Unusual for Dolichopodidae is that the tips of surstyli, aedeagus, and hypandrium are generally hidden inside a concave depression formed by the fourth and fifth abdominal segments. Hence it is necessary to remove them with a watchmaker pin from this sternal cavity in order to perform a quick identification.

Figures

Fig. 1. Habitus of Nepalomyia harpago, new species (Endau Rompin, Malaysia).

Figs. 2–4. Nepalomyia harpago, new species: 2, third antennal segment; 3, details of the tip of the third antennal segment; 4, postabdomen with hypopygium.