Strongylophthalmyia narwhal Evenhuis, 2020

Figs 24, 25-29, 30-33

Strongylophthalmyia narwhal Evenhuis, 2020: 5 (protologue). Holotype (♂): Thailand, Chiang Mai, Chiang Mai, QSBG.

Type material examined.

Holotype (♂): Thailand, Chiang Mai, Queen Sirikit Botanical Garden, 2013.vii.11-25, leg. M. Hauser, by Malaise trap (QSBG).

Other materials examined.

China. Yunnan: Honghe, Lvchun, Huanglianshan, 380 m, 2018.iv.15, leg. Liang Wang (1♂, CAU); same locality and collector as preceding, 1300 m, 2018.iv.16 (1♂, CAU); Xishuangbanna, Jinghong, Naban River Watershed National Nature Reserve, Mandian Waterfall, 700 m, 2020.xi.25, leg. Liang Wang (1♂, CAU) .

Diagnosis.

Generally shiny blackish brown (Fig. 24); antennal first flagellomere of male yellowish brown with apical half darkened, round, with a long, thick, sword-like process (Figs 26, 27); wing infumate, with large dark suffusion at apex and narrow median transverse band at level of dm-m (Fig. 29); fore femur yellow with narrow brown ring subapically (Fig. 24); mid and hind femora yellowish brown, with apical half of mid femur and broad subbasal and subapical rings of hind femur dark brown (Fig. 24); hind femur of male with one wart-like inner basal process; distiphallus approx. 1.3 × as long as phallapodeme, with small apical “glans” (Figs 32, 33).

Description of male genitalia.

Epandrium (Figs 30, 31) short and narrow, with long, dense setae. Surstylus (Figs 30, 31) with short stout setae on inner distal surface. Cerci (Figs 30, 31) narrow, elongate, finger-like, fused along length, with 1 long subapical seta and several short setae. Hypandrium (Figs 32, 33) narrowly rounded anteriorly, strongly arched medially, with one pair of bifid anterior lobes. Phallapodeme (Figs 32, 33) short, slightly curved, distinctly shorter than distiphallus. Pregonite (Fig. 32) very long, narrow, band-like, basally fused to inner surface of hypandrium. Phallic plate (Fig. 33) divided into two articulating sclerites. Distiphallus (Figs 32, 33) extremely long, nearly 1.3 × as long as phallapodeme, unsegmented, with sclerotized bands and apical “glans”, membrane microtrichose. Ejaculatory apodeme (Fig. 33) relatively large, slightly curved.

Distribution.

China - Yunnan: Jinghong*, Lvchun* (Fig. 56). Thailand - Chiang Mai: Chiang Mai (Evenhuis 2020).

Remarks.

This species was described based on a male holotype from Chiang Mai, Thailand (Evenhuis 2020). Newly available specimens from Yunnan, China are identical in most of the features described by Evenhuis (2020), but differs in the following aspects: (i) gena blackish brown as general body color; (ii) both wings with narrow median transverse band at level of dm-m; (iii) legs yellow to yellowish brown, with basal half of fore coxa, narrow subapical ring of fore femur, apical half of mid femur (except extreme apex), broad subbasal and subapical rings of hind femur, mid and hind tibiae (except bases and apices) and tarsomeres 4 and 5 brown to dark brown.

The chaetotaxy, which was not mentioned in the original description, can now be added as: head with 1 inner vertical seta, 1 outer vertical seta, 3 fronto-orbital setae, 1 ocellar seta and 1 postocellar seta; thorax with 1 anepisternal seta, 1 postpronotal seta, 2 notopleural setae, 2 dorsocentral setae, 2 posterior supra-alar setae and 1 scutellar seta; mid femur with row of long erect black setae. The male genitalia are described as above.