Epiphragma (Epiphragma) acuminatum, Zhang, Bing, Mao, Meng & Yang, Ding, 2019

Zhang, Bing, Mao, Meng & Yang, Ding, 2019, New species of the subgenus Epiphragma Osten Sacken from China (Diptera, Limoniidae), ZooKeys 876, pp. 39-54 : 39

Epiphragma (Epiphragma) acuminatum sp. nov. Figs 1 , 2 , 8 , 12 , 16-21

Diagnosis.

Generally brownish yellow with pale gray pruinosity. Femora yellow with two dark brown rings, first at basal 2/3, second at tip, broader. Wing brownish hyaline with conspicuous brown pattern, chiefly spotted, with narrow dark brown margin, brownish hyaline areas large. Origin of Rs obtuse and curved with short spur; m-cu at basal 1/3 of cell dm. Interbase with long and slender rod beyond base, longer than gonocoxite, apex with sharp point; whole slender rod S-shaped. Aedeagus 1/2 as long as gonocoxite, sword-tip shaped.

Description.

Male. (n = 3): Body length 11.5-13.0 mm, wing length 12.0-14.0 mm, antenna length 2.5-2.7 mm. Head ( Figs 1 , 8 ). Brownish yellow with pale gray pruinosity except orbit pale yellow. One median tubercle between eyes. Setae on head black. Scape and pedicel brown, flagellum 13-segmented with two basal segments fused, fusion-segment yellow, succeeding segments brownish, flagellomeres cylindrical, apical segments elongate, with longer verticils. Proboscis brownish black with black setae; palpus black with black setae.

Thorax ( Figs 1 , 8 ). Generally brownish yellow with pale gray pruinosity. Pronotum and prescutum brownish yellow. Prescutum with four black stripes, intermediate pair long and almost extended to transverse suture. Scutum brownish black, intermediate brownish yellow, scutellum and mediotergite brownish yellow. Pleura brown, variegated by brownish yellow areas. Setae on thorax brown. Coxae and trochanters yellow; femora yellow with two dark brown rings, first at basal 2/3, second at tip, broader; tibiae brown with one spur; tarsi brown. Setae on legs brown except coxae with brownish yellow setae. Wing ( Figs 1 , 12 ). Brownish hyaline with conspicuous brown pattern, chiefly spotted, with narrow dark brown margin, brownish hyaline areas large. Base of wing brown, connected with two large ocellate circles with flattened tips; one circle along cord connected with second circle. Stigma solidly dark brown. Origin of Rs obtuse and curved with short spur; R2+3+4 longer than R2+3; m-cu at basal 1/3 of cell dm. Halter 1.7-1.8 mm long, brownish black except base of stem yellow and apex of knob pale yellow. Setae on wings brownish yellow.

Abdomen ( Fig. 1 ). Tergites 1-5 brownish yellow; tergites 6-9 brownish black. Sternites 1-5 grayish yellow, both sides brownish yellow; sternites 6-9 brownish black. Setae on abdomen brown. Hypopygium ( Figs 16-21 ). Posterior margin of tergite 9 ( Figs 16 , 19 , 20 ) with subtrigonal lobe on each side of median V-shaped notch. Base of outer gonostylus ( Figs 17 , 19-21 ) broad, tip curved into spine. Base of inner gonostylus ( Figs 18-21 ) with setae, tip obtuse and curved up. Interbase ( Figs 20 , 21 ) with long and slender rod beyond base, longer than gonocoxite, apex with sharp point; whole slender rod S-shaped. Aedeagus ( Figs 20 , 21 ) half as long as gonocoxite, sword-tip shaped.

Female. (n = 19): Body length 12.6-14.0 mm, wing length 12.8-14.2 mm, antenna length 2.5-2.7 mm. Similar to male. Cerci reddish brown; hypovalves brown ( Fig. 2 ).

Type Material.

Holotype male (CAU), China: Ningxia, Jingyuan, Liupanshan, Liangdianxia, 2007.VI.28, Gang Yao (light trap). Paratypes: 2 males, 8 females (CAU), China: Ningxia, Jingyuan, Liupanshan, Liangdianxia, 2007.VI.28, Gang Yao (light trap); 2 females (CAU), China: Ningxia, Jingyuan, Liupanshan, Liangdianxia, 2007.VI.27, Gang Yao (light trap); 8 females (CAU), China: Ningxia Yinchuan Helanshan Suyukou, 2007. VII. 5, Gang Yao; 1 female (CAU), China: Ningxia, Jingyuan, Liupanshan, Liangdianxia, 2007.VII.15, Gang Yao (light trap).

Distribution.

China (Ningxia).

Etymology.

The specific name refers to the interbase narrowing to a slender point.

Remarks.

This new species is somewhat similar to E. (E.) sultanum Alexander, 1938 from China (Sichuan) in having a similar shape of the hypopygium, but it can be separated from the latter in having the femora yellow with two dark brown rings, the origin of Rs obtuse and curved with a short spur, and m-cu at basal 1/3 of cell dm. In E. (E.) sultanum , the femora are black brown with a narrow yellow ring; the origin of Rs is obtuse and without a spur; and m-cu is at basal 1/2 of cell dm ( Alexander 1938).

Figures

Figures 1 - 6. 1, 2 Epiphragma (Epiphragma) acuminatum sp. nov. 3, 4 Epiphragma (Epiphragma) henanensis sp. nov. 5, 6 Epiphragma (Epiphragma) longitubum sp. nov. 1, 3, 5 male habitus, lateral view 2, 4, 6 female habitus, lateral view. Scale bars: 1 mm.

Figures 8 - 11. Head and thorax (male). dorsal view. 8 Epiphragma (Epiphragma) acuminatum sp. nov. 9 Epiphragma (Epiphragma) henanensis sp. nov. 10 Epiphragma (Epiphragma) insigne (van der Wulp, 1878) 11 Epiphragma (Epiphragma) longitubum sp. nov. Scale bars: 1 mm.

Figures 12 - 15. Wing (male). 12 Epiphragma (Epiphragma) acuminatum sp. nov. 13 Epiphragma (Epiphragma) henanensis sp. nov. 14 Epiphragma (Epiphragma) insigne (van der Wulp, 1878) 15 Epiphragma (Epiphragma) longitubum sp. nov. Scale bars: 1 mm.

Figures 16 - 21. Epiphragma (Epiphragma) acuminatum sp. nov. 16 Ninth tergite, dorsal view 17 outer gonostylus, lateral view 18 inner gonostylus, lateral view 19 hypopygium, lateral view 20 hypopygium, dorsal view 21 hypopygium, ventral view. Scale bars: 0.1 mm.