Key (online version)
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1a |
| Postpronotal seta present. |
| Suillia atricornis (Meigen, 1830) |
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| b |
| Postpronotal seta absent. |
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2 |
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2a |
| Scutellum with prominent apical tubular projection. |
| Suillia oxyphora (Mik, 1900) |
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| b |
| Scutellum without prominent projection. |
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3 |
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3a |
| Scutellum entirely bare, devoid of fine dark hairs (care must be taken with <i>bicolor</i> where short, pale hairs are present). |
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4 |
| b |
| Scutellum at least with marginal hairs. |
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6 |
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4a |
| Wing veins heavily shaded. Antennae dark. Junction of facial and frontal orbit with dark spot. Double vibrissae. |
| Suillia ustulata (Meigen, 1830) |
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| b |
| Wing veins clear. Antennae pale. Orbital spot absent. Single vibrisse. |
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5 |
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5a |
| Scutellum with small median tubercle [PB: which may be hardly perceptible?]. Scutum matt. Male fore metatarsus without ventral hook. |
| Suillia fuscicornis (Zetterstedt, 1847) |
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| b |
Scutellum without small median tubercle. Scutum subshining. Male fore metatarsus with ventral hook.
<span class='small'><i>Suillia miki</i> (Pokorny, 1886) would run to this couplet and can be distinguished from <i>dumicola</i> on characters of the genitalia.</span> |
| Suillia dumicola (Collin, 1943) |
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6a |
| Anepisternum and anepimeron setose. |
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7 |
| b |
| Anepisternum and anepimeron bare. |
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9 |
| |
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7a |
| Subscutellar hairs present. |
| Suillia humilis (Meigen, 1830) (=inornata (Loew, 1862)) |
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| b |
| Subscutellar hairs absent. |
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8 |
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8a |
| Arista long plumose. Cross veins and radial vein shaded with a subapical suffusion across distal area of longitudinal veins. |
| Suillia variegata (Loew, 1862) |
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| b |
| Arista short plumose. Only cross veins shaded. |
| Suillia notata (Meigen, 1830) |
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9a |
| Subscutellar hairs absent. |
|
10 |
| b |
| Subscutellar hairs present. |
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13 |
| |
|
10a |
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11 |
| b |
| Arista short plumose or pubescent. |
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12 |
| |
|
11a |
| Scutellum with hairs near the margins only. Proepisternal hairs absent. |
| Suillia flava (Meigen, 1830) |
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| b |
| Scutellum almost completely haired dorsally. Proepisternal hairs present above base of fore coxae. |
| Suillia affinis (Meigen, 1830) |
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12a |
| Cross veins clear. Male fore metatarsus with ventral hook. |
| Suillia bicolor (Zetterstedt, 1838) |
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| b |
| Cross veins shaded. Male fore metatarsus without ventral hook. |
| Suillia flavifrons (Zetterstedt, 1838) |
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13a |
| Scutellum hairy all over. Fore tarsal segment 5 enlarged, longer than segments 3 and 4 combined. |
| Suillia vaginata (Loew, 1862) |
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| b |
| Scutellum with bare areas. Fore tarsal segment 5 narrower and shorter than segments 3 and 4 combined. |
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14 |
| |
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14a |
| Cross veins faintly shaded. Arista long plumose. |
| Suillia pallida (Fallén, 1820) |
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| b |
| Cross veins and tips of radial veins heavily shaded. Arista short plumose or pubescent. |
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15 |
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15a |
Narrow median area on scutellum bare. Arista short plumose.
<span class='small'>According to Czerny (1924) this species can be separated from <i>similis</i> (Meigen, 1830) by the clearly delimited spots at the ends of the longitudinal veins.</span> |
| Suillia imberbis Czerny, 1924 |
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| b |
| Broad median area on scutellum bare. |
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16 |
| |
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16a |
| Arista short plumose. |
| Suillia laevifrons (Loew, 1862) |
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| b |
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17 |
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17a |
| Pruinosity of ocellar triangle extends beyond that of the orbital setae. Orbital setae well forward of anterior ocellus. |
| Suillia parva (Loew, 1862) |
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| b |
| Pruinosity of ocellar triangle does not extend as far as that of the orbital setae. Orbital setae well forward of anterior ocellus. |
| Suillia dawnae Withers, 1987 |
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