Cheilosia convexifrons Stackelberg

Barkalov, Anatolij V. & Ichige, Katsuyoshi, 2016, Review of the Asian species of the subgenus Neocheilosia Barkalov (Diptera, Syrphidae), with description of new species, Zootaxa 4150 (5), pp. 571-580 : 572

Cheilosia convexifrons Stackelberg

( Figs 1 A–G)

Cheilosia convexifrons Stackelberg, 1963: 4 .

Literature. Zimina (1968: 68); Violovitsh (1976: 335), ( 1982: 202); Barkalov (1983b: 85); Barkalov (1984: 85); Mutin & Barkalov (1999: 236).

Material examined. Russia: Yakutia: 1Ƌ, 1♀ Yakutia , Tokko Village on Chara River , 30 km SW of Olekminsk Town, 30– 31.05.1980, leg. A. Bagatshanova, ZMISEA; 1Ƌ , 4♀ Oktemtsy , 50 km SW of Yakutsk, 30.05–7.06.1976, leg. A. Bagatshanova, IBPC ; 2♀ Aldan River, Malyj Aldan Village , 28.05.1981, leg. A. Bagatshanova, IBPC ; 1♀ Magadan Province, mouth of the Kegali River , 17.06.1968, E. Levina, ZMISEA ; 1♀ Khabarovsk Territory: Komsomolsk-on-Amur , 16.05.1977, leg. V. Mutin, ZMISEA ; 1♀ 40 km NE of Komsomolsk-on-Amur , 13.05.1986, leg. V. Mutin, ZMISEA; 1Ƌ Primorskij Territory , 30 km N of Ternej Village , 26.05.1982, leg. V. Mutin, ZMISEA.

Diagnosis. Males of C. convexifrons are similar to C. morio but differ in the broader central knob ( Fig. 1 A) and black hairs on disk of tergites II–III. In C. morio , the central knob is narrow despite of the very broad face ( Fig. 3 A), and tergites II–III are covered with light hairs on disk. In female C. convexifrons , the eye margins and lateral stripes on the frons near the eyes are often orange-brown, and the mesonotum and abdomen are covered with short black hairs. In female C. morio , the eye margins and lateral stripes of the frons are black, and the mesonotum and abdomen are covered with yellow hairs.

Distribution. Russia: Yakutia and Far East.

Figures

FIGURE 1. Cheilosia convexifrons. A: head of male, lateral view. B: basoflagellomere of male, lateral view. C: head of female, dorsal view. D: surstylus and gonocercus, lateral view. E: head of male, anterior view. F: aedeagus with apodeme. G: superior lobe of hypandrium, lateral view.

FIGURE 3. Cheilosia morio. A: head of male, lateral view. B: head of female, dorsal view. C: head of male, anterior view. D: pedicel and basoflagellomere of female, lateral view. E: surstylus and gonocercus, lateral view. F: aedeagus with apodeme. G: superior lobe of hypandrium, lateral view.