1a |
Pronotal disk with median longitudinal pale line |
2 |
1b |
Pronotal disk with transverse lines unbroken by pale longitudinal median lin |
7 |
|
2a(1a) |
Tip of the mesoepimeron as close, or closer, to scent gland osteole than to the mesosternum (seen in ventral view, mesoepimeron extends from lateral margin posterolaterally to the prothoracic lobe, and extends posteromedially) |
3 |
2b |
Scent gland osteole remote from tip of mesoepimeron, farther than distance from tip to mesosternum |
5 |
|
3a(2a) |
a. Hemelytra nearly black with somewhat wide but obscure longitudinal pale markings |
Sigara variabilis (Hungerford) |
b. Dorsal edge of male pala thickened, with a prominent keel on the outside |
c. Body length about 5.7-6.6 mm |
3b |
a. Hemelytral markings not as above |
4 |
b. Male pala not as above |
|
4a(3b) |
a. Male pala with a single row of pegs |
Sigara johnstoni Hungerford |
b. Female abdomen with anal lobes not notched on inner margin |
c. Body length about 6.3-7.2 mm |
4b |
a. Male pala with two rows of pegs |
Sigara knighti Hungerford |
b. Female abdomen with anal lobes notched on inner ventral margin |
c. Body length about 5.4-6.5 mm |
|
5a(2b) |
a. Pronotum and hemelytra (including membrane) boldly cross-barred |
Sigara transfigurata (Walley) |
b. Vertex in both sexes conically produced beyond eye-curve |
c. Body length about 5.5-5.8 mm |
5b |
a. Pronotum and hemelytra not so cross-barred, less striking |
6 |
b. Vertex not noticeably produced |
|
6a |
a. Pattern of membrane effaced or indistinct |
Sigara compressoidea (Hungerford) |
b. Pale figures on corium and distal half of clavis transverse |
c. Male strigil small and round |
d. Body length about 5.2-5.8 mm |
6b |
a. Pattern of membrane usually distinct |
Sigara mackinacensis (Hungerford) |
b. Pale figures on corium and distal half of clavis arranged more or less longitudinally |
c. Male strigil elongate |
d. Body length about 5.0-6.3 mm |
|
7a(1b) |
Body length of males > 6.8 mm, females > 7.3 mm |
8 |
7b |
Body length of males < 6.7 mm, females < 7.2 mm |
11 |
|
8a(7a) |
a. Metaxyphus broad, truncated or notched at tip |
Sigara decorata (Abbott) |
b. Claw of pala serrate at base in both sexes |
c. Body length about 8.1-9.5 mm |
8b |
a. Metaxyphus pointed apically |
9 |
|
9a(8b) |
a. Pala of both sexes with 14-16 lower palmar hairs |
Sigara decoratella (Hungerford) |
b. Pale marks on corium distinctly transverse |
a. Body length about 6.9-8.2 mm |
9b |
a. Pala of both sexes with 18-22 lower palmar hairs |
10 |
b. Pale marks on corium never distinctly transverse, but at least somewhat longitudinal |
|
10a(9b) |
a. Interocular space plainly narrower than width of an eye |
Sigara penniensis (Hungerford) |
b. Pale marks on corium and distal half of clavus arranged in a definite longitudinal series |
c. Male pala with peg row near palm |
d. Body length about 6.9-7.9 mm |
10b |
Interocular space
equal to the width of an eye |
Sigara conocephala (Hungerford) |
Pale marks on clavus and some on corium transverse |
Male pala not as above |
Body length 7.3-8.5 mm |
|
11a(7b) |
a. Two black longitudinal stripes on corium |
Sigara lineata (Forster) |
b. Body length < 4.6 mm (about 3.8-4.6 mm) |
11b |
a. Body length >4.6 mm; if body length <5.0 mm, corium without longitudinal
stripes |
|
|
12a(11b) |
Metaxyphus much longer than wide (measured from widest point to tip) |
13 |
12b |
Metaxyphus short, at most as long as wide |
16 |
|
13a(12a) |
a. Clavus with pale lines in a wavy longitudinal series |
Sigara douglasensis (Hungerford) |
b. Hypo-ocular suture ending laterad of the middle line of the eyes |
c. Body length about 5.2-5.9 mm |
13b |
a. Markings on clavus and corium not in a wavy longitudinal series |
14 |
|
14a(13b) |
a. Mesoepimeron, at level of scent gland osteole, about equal in width to the prothoracic lobe |
Sigara dolabra Hungerford and Sailer |
b. Male with stridular area on front femor |
c. Female pala depressed dorsally near apex |
d. Body length about 6.0-6.8 mm |
14b |
a. Mesoepimeron, at level of scent gland osteole, much broader than the width of the prothoraci |
15 |
|
15a(14b) |
a. Hemelytral pattern dark, with little contrast between light and dark marks |
Sigara signata (Fieber) |
b. Pale bands on corium more or less broken and confused |
c. Dorsal surface of metafemur with 2 or 3 rows of pegs |
d. Female pala depressed dorsally near apex |
e. Body length about 4.5-5.3 mm |
15b |
a. Hemelytral pattern bold |
Sigara solensis (Hungerford) |
b. Pale bands on base of clavus entire, bands on corium plainly transverse |
c. Dorsal surface of metafemur with only 3 or 4 pegs |
d. Female pala normal, not as above |
e. Body length 4.8-5.8 mm |
|
16a(12b) |
Scent gland osteole nearer the base of the mesoepimeron than the tip |
17 |
16b |
Scent gland osteole nearer the tip of the mesoepimeron than the base |
20 |
|
17a(16a) |
a. Corium with 3 dark longitudinal stripes |
Sigara trilineata (Provancher) |
b. Body length 5.1-6.0 mm |
17b |
a. Corium without without dark longitudinal stripes |
18 |
|
18a(17b) |
a. Head with a median longitudinal brown line |
Sigara mathesoni Hungerford |
b. Mesoepimeron with a deep incision at or near the lateral bend |
c. Body length 4.8-5.6 mm |
18b |
a. Head without such a longitudinal line |
19 |
b. Mesoepimeron without a deep incision near the lateral bend |
|
19a(18b) |
a. Osteole almost in the lateral bend of the mesoepimeron, at least 4/5th the distance from the tip |
Sigara grossolineata Hungerford |
b. Tip of metaxyphus truncated |
c. Body length about 4.8-5.9 mm |
19b |
a. Osteole not so close to the lateral bend, about 1/2-3/5 the distance from the tip |
Sigara modesta (Abbott) |
b. Tip of metaxyphus rounded |
|
20a(16b) |
a. Corium with 3 bold, uninterrupted, longitudinal black stripes |
Sigara mullettensis (Hungerford) |
b. Male pala with 2 rows of pegs |
c. Anal lobes of female only very slightly notched on inner margin |
d. Body length about 5.5-6.8 mm |
20b |
a. Corial pattern transverse or indistinctly longitudinal |
21 |
b. Male pala with one row of pegs |
c. If corial pattern is somewhat longitudinal, anal lobes of female distinctly notched on inner margin |
|
21a(20a) |
a. Pattern of membrane, and usually also the inner basal angle of clavus, effaced or obscure |
Sigara hubbelli (Hungerford) |
b. 4-6 pegs on dorsal surface of hind femur |
c. Body length 4.6-5.6 mm |
21b |
a. Pattern of membrane and clavus distinct |
22 |
b. Body length >5.2 mm |
|
22a(21b) |
a. Pronotum crossed by 5 or 6 dark bands |
Sigara macropala (Hungerford) |
b. Body length about 5.2-5.9 mm |
22b |
a. Pronotum crossed
by 8 or 9 dark bands |
23 |
|
23a(22b) |
a. Corium with 3 or more or less distinct dark longitudinal bands |
Sigara defecta Hungerford |
b. Pale of male with pegs becoming widely separated distally |
c. Anal lobes of female notched on inner margin |
d. Body length about 5.4-6.8 mm |
23b |
a. Corium without 3 dark longtiduinal band |
24 |
b. Pegs of male pala evenly spaced |
c. Anal lobes of female not notched on inner margin |
|
24a(23b) |
Metaxyphus short, plainly broader than long, and margins at right angle to a rounded tip |
Sigara bicoloripennis (Walley |
24b |
Metaxyphus about as broad as long, and margins forming less than a right angle to a pointed tip |
25 |
|
25a(24b) |
a. Mesoepimeron of equal width from osteole to the lateral bend |
Sigara alternata (Say) |
b. Osteole posterior to the disto-lateral angle of the mesosternum |
c. Body length about 5.9-7.2 mm |
25b |
a. Mesoepimeron broader at the lateral bend than at the level of the scent gland osteole |
Sigara zimmermanni (Fieber) |
b. Osteole on a level with the disto-lateral angle of the mesosternum |
c. Body length <5.0 mm |
also: Hind femur pubescent ventrally for 2/3 its length and with only 2-3 spines or none on the dorsal surface |