1a |
a. Males |
2 |
1b |
b. Females |
6 |
|
2a(1a) |
a. Cerci in dorsal view each with a lateral spine or moderate lateral angulation |
3 |
2b |
a. Cerci in dorsal view without lateral spines or angulation, at most with a low, rounded lateral swelling |
5 |
|
3a(2a) |
a. Coloration not dark, and/or with dark and pale areas strongly contrasting, metepisternal pale stripes well-developed |
Phanogomphus graslinellus (Walsh) |
b. Ab7-9 moderately expanded, ventrolateral flange on Ab8 >0.2mm wide |
also: Tibiae and tasi entirely black or very dark brown except pale on basal 4/5 or less of tibial extensor surfaces; anterior hamules each smoothly curved, not strongly bent anteriorly near the midlength; anterior lamina in lateral view trunccate or rounded apically; cerci in lateral view each with a ventromedial flange forming a small, rounded or somewhat angulate prominence at 4/5 or more of cercus length |
3b |
a. Coloration dark, and with dark and pale areas not strongly contrasting, metepisternal pale stripes absent or vestigial |
4 |
b. Ab7-9 hardly expanded, ventrolateral flange on Ab8 usually no more than 0.2mm wide |
|
4a(3b) |
a. Cerci, in dorsal view, each with a prominent lateral tooth, in lateral view with a prominent, stout, ventral spine or tooth |
Phanogomphus spicatus (Hagen) |
b. Posterior hamules each with a distinct shoulder |
4b |
a. Cerci, in dorsal view, each with a lateral angulation but without a distinct tooth, in lateral view without a ventral spine or tooth |
Phanogomphus lividus (Selys) |
b. Posterior hamules each without a distinct shoulder |
|
5a(2b) |
a. Metatibiae entirely black |
Phanogomphus quadricolor (Walsh) |
b. Anterior hamules each with a long, flacate terminal hook |
c. Posterior hamules each without a distinct shoulder |
d. Cerci, in lateral view, each with a small ventral tooth at about 2/3 its length |
5b |
a. Metatibiae with extensor surfaces pale |
Phanogomphus exilis (Selys) |
b. Anterior hamules each with only a short, spine-line terminal hook |
c. Posterior hamules with a distinct shoulder |
d. Cerci, in lateral view, without ventral teeth |
|
6a(1b) |
a. Metatibiae entire black |
Phanogomphus quadricolor (Walsh) |
also: Small lateral spines present on vertex near margin of eye, generally appressed to the surface of cranium; interpleural dark stripe well-developed; subgenital plate with lobes directed downward at approximately right angles to Ab9 sternum |
6b |
a. Metatibiae with at least the extensor surfaces pale |
7 |
|
7a(6b) |
a. Subgenital plate nearly 1/3 length of Ab9 sternum, or longer, apex of each lobe acute |
Phanogomphus spicatus (Hagen) |
b. Posterior surface of occiput markedly trilobed |
7b |
a. Subgenital plate no more than 1/5 the length of Ab9 sternum, apex of each lobe usually blunt |
8 |
b. Posterior surface of occiput usually not markedly trilobed |
|
8a(7b) |
a. Middorsal stripe of nearly uniform width |
Phanogomphus graslinellus (Walsh) |
b. Subgenital plate about 1/8 the length of Ab9 sternum |
also: Tibiae and tarsi entirely black or very dark brown except pale on the basal 4/5 or less of tibial extensor surfaces; lobes of subgenital plate broadly rounded distally, median notch relatively wide, more than 45° |
8b |
a. Middorsal dark stripe markedly widened anteroventrally |
9 |
b. Subgenital plate variable |
|
9a(8b) |
a. Subgenital plate about 1/5 the length of Ab9 sternum, its lobes each as long as wide |
Phanogomphus exilis (Selys) |
b. Vertex with small, acute, dorsolaterally-directed lateral spines |
9b |
a. Subgenital plate about 1/10-1/7 length of Ab9 sternum, its lobes each wider than long |
Phanogomphus lividus (Selys) |
b. Vertex with small, acut, more or less erect lateral spines |
|
|