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A NEW SPECIES OF THE GENUS STIRELLUS OSBORN ET BALL, 1902 (HEMIPTERA: AUCHENORRHYNCHA: CICADELLIDAE: DELTOCEPHALINAE) FROM THE UNITED ARAB EMIRATES

The genus Stirellus Osborn et Ball, 1902 is “a large and heterogeneous assemblage of species distributed worldwide” currently includes 25 other names of generic level considered as junior synonyms with more than 90 species described (Dmitriev 2003, Duan et al. 2016, 2019). This genus belongs to the tribe Stenometopiini Baker, 1923 together with the monotypical Kinonia Ball, 1933, known from USA and Mexico, and Hodoedocus Jacobi, 1910 which comprises seven Old World species (tropical Africa, Oriental Region, and Australia), and one New World species (Guatemala) (Dmitriev 2003, Duan et al. 2019). The species of the genus Stirellus are characterized by the frons without median carina and the aedeagus with long and narrow, often s-shaped, shaft. The new species described below was collected by sweeping in Sharjah Desert National Park during my field trip to the United Arab Emirates in April 2010 in frame of the project targeting the arthropod fauna of the UAE directed by Dr. Antonios van Harten (Almada, Portugal), and represents the first record of the tribe Stenometopiini Baker from the country.


INTRODUCTION
The genus Stirellus Osborn et Ball, 1902 is "a large and heterogeneous assemblage of species distributed worldwide" currently includes 25 other names of generic level considered as junior synonyms with more than 90 species described (Dmitriev 2003, Duan et al. 2016. This genus belongs to the tribe Stenometopiini Baker, 1923 together with the monotypical Kinonia Ball, 1933, known from USA andMexico, andHodoedocus Jacobi, 1910 which comprises seven Old World species (tropical Africa, Oriental Region, and Australia), and one New World species (Guatemala) (Dmitriev 2003, Duan et al. 2019. The species of the genus Stirellus are characterized by the frons without median carina and the aedeagus with long and narrow, often s-shaped, shaft. The new species described below was collected by sweeping in Sharjah Desert National Park during my field trip to the United Arab Emirates in April 2010 in frame of the project targeting the arthropod fauna of the UAE directed by Dr. Antonios van Harten (Almada, Portugal), and represents the first record of the tribe Stenometopiini Baker from the country.

MATERIAL AND METHODS
The photographs were taken using light microscope Leica MZ9.5 and a Leica DFC 490 camera. Images were produced using Helicon Focus V. 6.7.1 and Adobe Photoshop software. The genital segments of the examined specimen were macerated in 10% KOH and figured in glycerine jelly (Brunel Micro Ltd, UK) using same microscope with camera lucida.
The type series of the species described below are deposited in the Zoological Institute of the Russian Academy of Sciences, Saint Petersburg, Russia. Diagnosis (after Zahniser & Dietrich 2013, Duan et al. 2016. Vertex with anterior margin rounded or elongately produced. Frons without median carina. Forewings variably developed, usually with three anteapical cells, with inner one basally opened; membrane reduced; veins not raised. Male pygofer sloping caudoventrally, with macrosetae reduced in number or absent, often with a lateral tooth on each lobe. Male anal tube long. Genital valve large, triangular-shaped. Connective Y-shaped or H-shaped. Aedeagus with long and narrow, often S-shaped, single shaft and single gonopore. Ovipositor protruding far beyond the pygofer apex. Stirellus desertus sp. n. ( (Figs 1-4). Frons darkened, except below its upper margin, with transverse yellow stripes besides of median line. Gena with wide brown cross band below the eye. Vertex with three pairs of large brown to dark brown comma-shaped spots -apical spots fused below apex of vertex and two pairs of spots behind are separated medially; median line dark brown between the spots (Figs 1, 3). Rostrum dark brown apically. Pronotum with light brown anterior margin, with 10 (3 + 2 + 2 + 3) brown to dark brown spots along the margin, and with transverse light brown stripe along posterior margin. Mesonotum with transverse dark brown stripe below the groove separating scutellum and with two brown spots below anterior margin. Fore wings with cells margined by brown stripes inside. Thorax from below and coxae anteriorly dark brown. Tibiae with dark brown dots at the bases of macrosetae. Inner margins of hind femora dark brown in a female. Apices of tarsomeres and claws from brown to dark brown. Abdominal sternites dark brown laterally. Laterotergites III dark brown almost completely. Laterotergites IV-VII partly dark brown and yellowish. Female abdominal tergites with dark brown median stripe. Female pygofer with elongate brown stripe laterally and with dark brown spot subapically on each side (Figs 4, 15).
Etymology. The species name refers to the type of biotope where it was collectedsand desert.

DISCUSSION
According to elongate, triangular-shaped vertex the new species described above is close to Stirellus capitatus (Distant, 1918), known from the Oriental Region (Duan et al. 2016), S. mitis (Kirkaldy, 1906, distributed in Austral- ian Region, S. atropunctus (Gillette, 1898) and S. fasciatus (Ball et Beamer, 1940) from the Nearctics, and to S. acuticeps (Ribaut, 1948) and S. pallifrons (Horváth, 1897), both known from the Western Palaearctic Region (Gillette 1898, Horváth 1897, Ball & Beamer 1940, DeLong 1948, Oman 1949, Ri baut 1948, Evans 1966, Nast 1972, Emeljanov et al. 2002. However, the new species is well distinguished by the coloration of the head and forewings -brown to dark brown comma-shaped spots on the vertex (Figs 1, 3) and forewings with cells margined by brown stripes inside (Figs 1-4). Other mentioned species are monotonously yellow greenish from above, except, S. mitis, S. atropunctus, and S. fasciatus having dark spots or stripes on vertex. S. fasciatus differs from S. desertus sp. n., as well as from S. mitis and S. atropunctus, by shorter vertex which is just "slightly longer at middle than width between eyes" (Ball & Beamer 1940). S. mitis is distinguished by brown apex of vertex, with two regular brown cross bands behind (Evans 1966, fig. 35, G 1), while S. atropunctus is characterized by light yellow vertex with a black spot at apex (Gillette 1898). The species figured by DeLong (1948) as S. atropunctus differs from original description given by Gillette (1898), based on two females, by the presence of four dark spots on vertex widely separated in the middle (DeLong 1948, fig. 210) which were not mentioned by Gillette when he wrote about S. atropunctus's vertex "…light yellow shaded with brown towards the apex, paler between the eyes, median stripe and two cross bars whitish, median dark line obsolete except at the base…" (Gillette 1898, p. 28). Apparently DeLong (1948) published the drawing of the head of another species from Illinois different from S. atropunctus Gillette described from Colorado in USA. Also Oman (1949) characterizing the genus Gillettiella Osborn, 1930 (junior synonym of Stirellus) mistakenly mentioned rounded anterior margin of vertex for all species including S. atropunctus even Gillette (1898) and Ball and Beamer (1940) noticed vertex strongly produced and acute for this species.
The tribe Stenometopiini Baker was known from Arabian Peninsula after the record of Stirellus instabilis (Ribaut, 1948) from Saudi Arabia by Dlabola (1979), but it is first record of the tribe from the United Arab Emirates, the cicadellid fauna of which is still in its initial stage of discovering (Gnezdilov 2019).