| Workers |
| 1 |
Node of petiole, from above, elongate, clearly longer than broad
(Figs. 39?40); largest workers more than 5 mm long . . |
2 |
| --
|
Node
of petiole, from above, stout, about as broad as long
(Fig. 41); largest workers 3?4 mm long |
6 |
| 2(1) |
Head more or less shiny, not densely sculptured and opaque;
at least side of pronotum usually distinctly shiny |
3 |
| --
|
Head
and mesosoma opaque, densely and often coarsely sculptured (fig.
38a) |
nigrescens (Cresson) (part) |
| 3(2)
|
Basal
margin of mandible evenly curved into masticatory margin, without
a tooth or corner at their junction (Fig. 33) |
4 |
| --
|
Basal
margin of mandible straight, forming distinct tooth or angle
with masticatory margin (Fig. 35) |
5 |
| 4(3)
|
Dorsal
surface of propodeum distinctly depressed below level of mesonotum
(Fig. 00); metafemur long, 6.4 x as long as deep |
nigrescens (Cresson) (part) |
| --
|
Dorsal
surface of propodeum not distinctly depressed (Fig. 00); metafemur
shorter, 5.2 x as long as deep |
californicus (Mayr) |
| 5(3)
|
Head
and mesosoma largely or entirely conspicuously roughened and
opaque or semiopaque; head relatively broad (Fig. 00) |
opacithorax (Mayr) |
| --
|
Head
and mesosoma smooth and shiny, with only occasional indications
of sculpturing on mesosoma; head relatively narrow (Fig. 00) |
nyensis Watkins |
| 6(1) |
Small species, HW not exceeding 1.0 mm; frontal carina complete,
forming broad lamella below antennal socket; dorsal surface
of propodeum at least as long as declivitous face; anteroventral
tooth of petiole present but weak |
leonardi (Wheeler) |
| -- |
Larger species, HW at least 1.0 mm; frontal carina abruptly
narrowed below, not forming lamella below antennal socket; dorsal
face of propodeum distinctly shorter than declivitous face;
anteroventral tooth of petiole usually well developed and with
posterior lamella |
swainsonii (Shuckard) |
| |
|
|
| |
|
|
| |
|
|
|
Males
|
| 1 |
Mandible sickle?shaped (Figs. 43, 45) |
2 |
| -- |
Mandible
not sickle?shaped (Figs. 44, 46) |
5 |
|
|
|
| 2
(1) |
Small, slender species, length 8-9 mm |
3 |
| -- |
Large, robust species, length 11-13 mm |
swainsonii (Shuckard) |
| 3
(2) |
Lateral ocelli not on prominent raised area and OOD greater
than OD (Fig. 45) |
4 |
| -- |
Lateral ocelli on raised area distinctly above level of rest
of head and OOD less than 0.50 x OD (Fig. 43) |
minor (Cresson) |
| 4
(3) |
Robust species; head and body dark charcoal grey; apical fork
of volsella with one to several small teeth along inner margin
(Fig. 00) |
microps Borgmeier
|
| --��������
|
More
slender species; head and mesosoma blackish, gaster reddish
brown; apical fork of volsella without teeth along inner margin
(Fig. 00)
|
mojave
(M. Smith) |
| 5
(4) |
From above, dorsal surface of head forming distinct ridges over
antennal sockets (Fig. 46); mesosomal dorsum subopaque to opaque |
nigrescens (Cresson) |
| -- |
From above, dorsal surface of head rounded, not forming distinct
ridges over antennal sockets (Fig. 44); mesosomal dorsum moderately
shiny |
opacithorax (Emery) |
|
(N.
microps and N. opacithorax are included here as they may be
present within our area, at least marginally.) |
|