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Key: The British species of the genus Suillia
After Withers (1987).
References
Withers, P., 1987. The British species of the genus Suillia (Diptera, Heleomyzidae), including a species new to science. – Proceedings and Transactions of the British Entomological and Natural History Society 20: 91-104.
Last modified 19/09/2012 21:59 by Paul BeukNo of couplets: 17

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