- Aulonium Erichson (figs. 18, 19): Both species presented
here are elongate, pale brown, and 3.5-5.0 mm long. They have relatively
short, clubbed antennae. Aulonium spp. are separated from other
SPB insect associates by the strong ridges running nearly the length
of the pronotum.
- A. ferrugineum Zimmermann, has distinguishing projections
on the anterior pronotum, which extend beyond the anterior corners (fig.
- A. tuberculatum LeConte males (fig. 18B) have distinct pronotal
tubercles that are absent in the females (fig. 18C).
- Colydium lineola Say (fig. 20): C. Lineola (3.5-5.5 mm) has
a ridged pronotum, but the elytra are much more elongate and cylindrical
than those of other colydiids found with the southern pine beetle.
- Lasconotus Erichson (fig. 21): Lasconotus spp. also
have a ridged pronotum, but all are considerably smaller (2.8 mm) than
Aulonium spp. They are reddish brown, with rough, striated
elytra, and clubbed antennae.