Eumerus, Meigen, 1822 Meigen, 1822

Hassan, Muhammad Asghar, Shehzad, Anjum, Dyola, Urmila, Qasim, Muhammad, Fatima, Noor & Maryam, Zershina, 2022, Two species of the hoverfly genus Eumerus Meigen (Diptera: Syrphidae) new record for Pakistan, Papéis Avulsos de Zoologia 62, pp. 1-10 : 2

Key to species of Eumerus from Pakistan

1. Eyes densely covered with short hairs;antennae orange.......................2

— Eyes bare or sparsely covered with microscopic hairs on lower half; antennae dark brown.........................................................................3

2. Body length 5.0- 6.5 mm;male hind distitarsus white and dorsoventrally flattened (Garcete-Barrett et al., 2020, figs. 2G), whereas distitarsus pale yellow with only the basitarsus flattened in females.................... .................................................... Eumerus aurifrons (Wiedemann)

— Body length 5.0-8.0 mm; males unknown; hind distitarsus pale yellow and normal,not swollen.................... Eumerus nepalensis Brunetti

3. Antennae elongated,pedicel ⅔ the length of the postpedicel ( Brunetti, 1923,plate VI,fig.6).................... Eumerus pulverulentus Brunetti

— Antennae short,pedicel ⅓ the length of the postpedicel......................4

4. Scutellum with posterior margin pale yellow ( Fig. 4A ); male with hind basitarsus swollen on apical ¾ ( Fig.6F )........ Eumerus vestitus Bezzi

— Scutellum wholly black;males hind tarsus normal,without modification as above.............................................................................................5

5. Body length 8.0 mm; males unknown; thorax dull black, covered with short yellowish-brown hairs, scutum without median longitudinal vittae ................................................ Eumerus sexvittatus Brunetti

— Body length 5.5-7.0 mm; thorax shiny black, covered with short white hairs, scutum with two longitudinal narrow vittae of white microtrichia ( Fig.1A )..................... Eumerus sogdianus Stackelberg

Figures

Figure 1. Eumerus sogdianus Stackelberg,male: (A) Dorsal habitus, (B) Lateral habitus,(C) Ventral habitus, (D) Head, frontal view,(E) Head, dorsal view, (F) Close view of male genital segments,ventral view.

Figure 4.EumerusvestitusBezzi,male.(A) Dorsalhabitus,(B)Lateral habitus,(C)Ventralhabitus,(D)Head,frontal view,(E)Head,lateral view,(F)Head,dorsalview.

Figure 6. Eumerus vestitus Bezzi, male. (A) Sternite IV, dorsal view, (B) Sternite IV, ventral view, (C) Sternite IV, close view ventral thick spatulated microtrichia, (D) Hind femora,posterior view,(E)Hind tarsus,lateral view,(F) Hind tarsus,posterior view,(G) Male genitalia,lateral view,(H) Male genitalia,ventral view.