Nemestrinus reticulatus Latreille, 1802

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 reticulatus Latreille, 1802

Figures 80-85

Nemestrinus reticulatus Latreille, 1802: 437. Type locality: not given but according to Latreille (1809: 307), it is Egypt and Syria.

Rhynchocephalus latreillei Fischer, 1812: 195.

Nemestrina cinctus Macquart, 1840: 16.

Nemestrina kindermanni Bischof, 1905: 172.

Diagnosis.

Frons with shiny yellow or black spot below ocelli; mesonotum with two gray spots at inner ends of the transverse suture, between them there is a thin longitudinal stripe; wing hyaline in posterior 1/2 and apex but brownish on anterior 1/2 and slightly infuscate at base; wing with small cells that extend forward from R2 to hind margin; abdomen gray, matte, with incomplete transverse black stripes; tergite II bears shiny black spots divided in the middle by a transverse longitudinal gray strip; black spots on tergites III-V more or less fused into bands with an emargination along the posterior margin; on tergite III, gray emargination varies from very deep to nearly absent; abdominal venter with dense gray pollinosity, the second sternite with central black spot.

Description.

Length: body 14-15 mm. Head black with dense gray pollinosity and whitish hairs; frons with shiny yellow or black spot below ocelli, in male frons at vertex nearly as wide as eye width (Figs 80 , 83 ), while in female nearly twice as eye width (Fig. 81 ); antenna with orange scape and pedicel, first flagellomere brown to blackish brown with some gray pollinosity (Fig. 82 ), basal two segments of stylus subequal in length and segment III 2/3 × longitudinal eye diameter; palpi yellow or brown with black apices. Thorax pale black with yellowish white or grayish white hairs, but longer and denser on scutellum and pleurae; mesonotum with two gray spots at inner ends of transverse suture and between them is a thin longitudinal stripe. Leg rusty red; in females, only hind tarsi blackish or hind leg entirely blackish; in males, all femora black; hind tibiae and tarsi blackish. Wing hyaline over posterior 1/2 and at apex, but somewhat brown over anterior 1/2 and slightly infuscate at base; wing with small cells that extend forward from R2 to hind margin (Fig. 85 ). Abdomen gray, matte, with incomplete transverse black stripes; tergite II with shiny black spots divided in the middle by a transverse longitudinal gray strip; black spots on tergites III-V are more or less fused into bands with an emargination along the posterior margin; on tergite III, gray emargination varies from very deep to nearly absent; abdominal venter with dense gray pollinosity, sternite II with black central spot (Fig. 84 ).

Local distribution.

Unknown.

Geographical distribution.

Armenia, Egypt, Greece, Russia (Caucasus), Saudi Arabia, Syria, and Turkey ( Sack 1933; Bernardi 1973).

Remarks.

This species is not represented in Egyptian collections nor in the field. We include the species here and in the key below as it has been recorded from Egypt ( Sack 1933 & Bernardi 1973 & Richter 1988); future research might reveal its presence in this part of Africa.

Figures

Figures 80 - 85. Nemestrinus reticulatus, male head, frontal (80), female head, frontal (81), male antenna (after Bequaert, 1938) (82), male head, lateral (83), female abdomen (after Sack 1933) (84), and wing (after Seguy, 1926) (85). Abbreviations: A 2. anal vein, al. alula, bm. basal medial cell, br. basal radial cell, C. costa, CuA 1,2, CuP. cubital veins, d. discal cell, DV. diagonal vein, h. humeral cross vein, m 3. third medial cell, M 1, M 2, M 3. medial veins, m-cu. cross vein between medial and cubital veins, R 1, R 2, R 3 + 4, R 5, Rs. radial veins, r-m. cross vein between redial and medial veins, Sc. subcostal vein.