| 1. |
A) |
Antenna black at base and sharply white to light reddish brown in apical half (Fig. B4.37). |
|
| B) |
Abdomen with apical segments light reddish brown (Fig. B4.41) and metatibia mainly to completely black (Fig. B4.43). |
| |
|
. . . . . . . . 2 |
| – |
a) |
Antenna black (Fig. B4.38), black and light reddish brown at base (pale and dark portions not sharply divided) (Fig. B4.39), or completely light reddish brown (Fig. B4.40). |
|
| b) |
Abdominal segments 7-9 or 8 and 9 black (Fig. B4.42) and metatibia mainly black (Fig. B4.44), or apical abdominal segments light reddish brown and metatibia reddish brown or mainly black (if the latter, use a). |
| |
|
. . . . . . . . 3 |
 |
| 2(1). |
A) |
Femora, tibiae, tarsi, head capsule except yellow genal spot, and thorax completely black (Figs. B4.45 & B4.47). |
|
| |
|
Urocerus cressoni Norton, 1864 |
| – |
a) |
Femora black except reddish brown at apex; metatibia in basal 0.25, protarsus mesotarsus and mesotibia, metatarsomeres 1 and 2 at base, and head capsule ventrally light reddish brown; pronotum reddish brown (Figs. B4.46 & B4.48). |
|
| |
|
Urocerus taxodii (Ashmead, 1904) |
|
| 3(1). |
A) |
Head mainly to completely reddish brown (Fig. B4.49) or genal white spot extending dorsally to medial area. |
|
| B) |
Antenna light reddish brown (Fig. B4.51). |
| |
|
. . . . . . . . 4 |
| – |
a) |
Head completely or mainly black in dorsal half, and with white genal spot restricted to area behind eye (Fig. B4.50). |
|
| b) |
Antenna black (Fig. B4.53), pale at base shifting to brown or black at apex (Fig. B4.52), or very rarely completely light reddish brown (if the latter, use a). |
| |
|
. . . . . . . . 5 |
|
| 4(3). |
A) |
Head without pits on much of dorsal surface except pits usually present and usually small near posterior edge of eye, behind ocelli and along longitudinal median furrow (Fig. B4.54). |
|
| B) |
Head capsule black in at least ventral half (Fig. B4.56). |
| C) |
Metafemur black and reddish brown in apical third, metatibia brown except basal fifth, metarsomere 1 brown except for reddish brown base and apex (Fig. B4.58); mesofemur black except apex; mesotibia and mesotarsomeres 1 and 2 light reddish brown; abdominal segments 7 (totally or partly), 8 and 9 black (Fig. B4.60). |
| |
|
Urocerus sah (Mocsáry, 1881) |
| – |
a) |
Head with large pits on much of dorsal surface except absent on genal spot behind eye (Fig. B4.55). |
|
| b) |
Head capsule completely light reddish brown (Fig. B4.57). |
| c) |
Femora, tibiae (except light reddish brown basal third of mesotibia, most of protibia and all of protarsus) and at least tarsomeres 1 and 2 of middle and hind legs reddish brown (Fig. B4.59); abdominal segments 7-9 light reddish brown (Fig. B4.61). |
| |
|
Urocerus californicus Norton, 1869 |
|
| 5(3). |
A) |
Metatarsomere 1 in lateral view 5.5-8.2 times as long as high (if between 5.5 and 6.3, use B) and its base with light reddish brown area about twice as long as high (Fig. B4.62). |
|
| B) |
Metatibia generally more than 7.0 times as long as high (if between 6.8 and 7.0, use A) (Fig. B4.64). |
| |
[Additional characters. Apex of metatarsomere 1 with narrow reddish brown transverse band. Head (except for white spot on gena) and pronotum black.] |
| |
|
Urocerus flavicornis (Fabricius, 1781) |
| |
[Note. If specimen from North America, then the character “A” range is 5.5–8.0 for U. flavicornis and 4.0–5.2 for U. albicornis, and the character “B” range is 5.5–7.0 for U. albicornis and 6.8–9.0 for U. flavicornis.] |
|
| – |
a) |
Metatarsomere 1 in lateral view 4.0–5.5 times as long as high (if between 5.5–6.3, use b) and its base with light reddish brown area about 1.0 or 1.5 times as long as high (Fig. B4.63). |
|
| b) |
Metatibia generally less than 6.8 times as long as high (if between 6.8-8.5, use a) (Fig. B4.65). |
| |
|
. . . . . . . . 6 |
|
| 6(5). |
A) |
Abdominal tergum 7 at least mainly black (Fig. B4.66). |
|
| B) |
Metatarsomere 1 in lateral view 4.0–4.4 times as long as high (if between 4.5–5.2, use A), its base with light reddish brown area about as long as high and its apex black or dark brown (Fig. B4.68). |
| |
[Additional characters. Abdomen with tergum 2 usually black; antenna usually black at least apically; pronotum dorsally usually partly to mostly reddish brown, rarely entirely black; head usually partly or mostly reddish brown ventral to antennal sockets.] |
| |
|
Urocerus albicornis (Fabricius, 1781) |
| – |
a) |
Abdominal tergum 7 mainly or completely reddish brown (Fig. B4.67). |
|
| b) |
Metatarsomere 1 in lateral view 5.3–6.3 times as long as high (if between 4.5–5.2, use a), its base with light reddish brown area about 1.5 times as long as high and its apex reddish brown (Fig. B4.69). |
| |
[Additional characters. Abdomen with tergum 2 reddish brown, rarely black; antenna usually all white, rarely darkened in apical 0.25; pronotum black dorsally, rarely with white area laterally on vertical surface ventral to anterolateral corner; head rarely with reddish brown spots ventral to antennal sockets.] |
| |
|
Urocerus gigas (Linnaeus, 1758) |
