Nemestrinus exalbidus (Lichtwardt, 1907)

El-Hashash, Arafa Elsayed, Badrawy, Haitham Badrawy Mousa & Ibrahim, Ayman Mohyie-Eldin, 2021, A review of tangle-veined flies (Nemestrinidae, Diptera) in Egypt, ZooKeys 1071, pp. 11-42 : 11

Nemestrinus exalbidus (Lichtwardt, 1907)

Figures 42-51 , 52-60

Nemestrina exalbidus Lichtwardt, 1907: 441. Type locality: Israel (Jerusalem).

Specimens examined.

W. Dar El-Maskhara 29°47'02.9"N, 31°24'59.9"E, 12.iv.1930 (1 f#); W. Hodein South Eastern Desert 23°5'14'"N, 35°19'45"E, 17.iii.1928 (1 m #); W. Hoff 29°53'02.6"N, 31°18'42.2"E, 12.iv.1921 (1 f#), 24.iii.1930 (1 m #); W. Zohleiga 26°07'59.9"N, 33°45'00.0"E, 27.iii.1925 (1 f#) (AZUC); Abu Rowash 30°04'30.7"N, 31°11'59.7"E, 16.iii.1927 (1 f#); Ogret El-Sheikh 29°52'50.1"N, 31°18'27.8"E, 31.iii.1926 (1 f#); W. Hoff 29°53'02.6"N, 31°18'42.2"E, 24.iii.1930 (1 m #); W. Rishrash 29°27'51"N, 31°22'2"E, 29.iii.1935 (7 m # & 4 f#) (CUC); Ogret El-Sheikh 29°52'50.1"N, 31°18'27.8"E, 14.iii.1927 (1 m #); W. Hoff 29°53'02.6"N, 31°18'42.2"E, 30.iii.1928 (1 m #); W. Zohleiga 26°07'59.9"N, 33°45'00.0"E, 25,29. iii.1925 (1 f#) (MAC); Etaka 29°26'19.1"N, 32°28'07.2"E, 22.ii.1951 (1 f#), 26.iii.1951 (1 m #); Kerdasa 30°01'32.1"N, 31°06'27.5"E, 14.iv.1951 (3 f#); Mansouriah 29°58'05.3"N, 31°08'51.9"E, 25.iv.1957 (1 m #); W. Kaber 23°26'29"N, 25°50'23"E, 1.iv.1994 (1 f#) (ASUC).

Diagnosis.

Frons covered with dense gray pollinosity except shiny black oval callus below ocellar triangle; wing hyaline, except slightly brownish along anterior margin, with a few small cells extending forward from R2+3 to M1 or M2. Abdomen orange or reddish with longitudinal median black vitta.

Redescription.

Length: male body 14-17 mm, wing 12.5-14.5 mm. Female body 18 mm, wing 15.5 mm. Head shiny black with white hairs; frons covered with dense gray pollinosity except shiny black oval callus below ocellar triangle; face rather conical (Figs 42-44 , 52-54 ). Thorax shiny black with dense whitish hairs laterally and a few dorsally. Leg orange, but femora black. Wing hyaline, except pale brownish anterior margin, with just a few small cells extending forward from R2+3 to M1 or M2 (Figs 46 , 56 ). The differences in cell number and structure on the wing is continuous variation and inconsistently different between males and females. Abdomen orange or reddish with longitudinal black median vitta; base of abdomen covered with dense, short, yellowish gray hairs, lateral margins of subsequent segments with dense white hairs; venter of abdomen entirely orange (Figs 47 , 57 ). Gonocoxite with only inner gonocoxal process, tapered apically (Figs 48 , 49 ); distiphallus narrow; parameral apodeme rather short, aedeagal tine narrow and curved, forming semicircle, pointed distally; ejaculatory apodeme distally broader (Figs 50 , 51 ). Female differentiated from male by the eyes that are more dichoptic. Female genitalia with rectangular subgenital plate, excavated proximally to approx. 1/2 length of plate (Fig. 58 ); genital furca with small genital aperture, between projections with broad ends, and curved posteromedially with small curve on upper and lower margins (Fig. 59 ); uterus large and flatted, spermathecae long (Fig. 60 ).

Local distribution.

Eastern Desert, Lower Nile.

Geographical distribution.

Egypt, Iran, and Israel ( Sack 1933; Bernardi 1973; Richter 1988).

Figures

Figures 42 - 51. Male of Nemestrinus exalbidus, head, frontal (42), head, dorsal (43), head, lateral (44), antenna (45), wing (46), and abdomen (47). 48 - 51 male genitalia: epandrium, proctiger, and cerci (48), gonocoxite with gonostylus, ventral (49), aedeagal complex, lateral (50) and dorsal (51). Abbreviations: aedg. aedeagus, aec. aedeagal complex, aedg tn. aedeagal tine A 2. anal vein, al. alula, bm. basal medial cell, br. basal radial cell, c. cerci, C. costa, CuA 1,2, CuP. cubital veins, d. discal cell, db. dorsal bridge, DV. diagonal vein, e. epandrium, ej. ejaculatory apodeme, endaedg pr. endoaedeagal process, 1 st fl. first flagellomere, gap. gonocoxal apodeme, gc. gonocoxite, gpr. gonocoxal process, gs. gonostylus, h. hypandrium, h. humeral cross vein, lat ej pr. lateral ejaculatory process, m 3. third medial cell, pm. parameres, pm ap. parameral apodeme, pr. proctiger, pt. phallic plate, M 1, M 2, M 3. medial veins, m-cu. cross vein between medial and cubital veins, pd, pedicel, R 1, R 2, R 3 + 4, R 5, Rs. radial veins, r-m. cross vein between redial and medial veins, Sc. subcostal vein, sc. Scape, st. stylus.

Figures 52 - 60. Female of Nemestrinus exalbidus, head, frontal (52), head, dorsal (53), head, lateral (54), antenna (55), wing (56), and abdomen (57). 58 - 60 female genitalia: subgenital plate (58), genital furca (59), and spermathecae (60). Abbreviations: ma. median aperture, pl. posterolateral projection, sp. spermatheca, spd. spermathecal duct, ut. uterus.