c. SADDLEBACK CATERPILLAR
(_Sibine stimulea_)
[Illustration: (unlabelled)]
Identification. The saddleback caterpillar is easy to recognize since
its brown sluglike body is covered mid-dorsally with markings that
resemble a brown or purplish saddle sitting on a green and white saddle
blanket. Upon close examination, stout spines can be observed along the
caterpillar’s lateral body margin and on its four tubercles. Many of
these spines are hairs that are connected at their bases with individual
poison glands. Just prior to pupation and subsequent development into a
moth, the caterpillar is 2-3 cm (0.8-1.2 in) long.
Distribution. In general, the saddleback caterpillar in the United
States is distributed southeast of a diagonal line drawn from
Massachusetts through the middle of Texas.[68]
Biology/Behavior. From May to November, _Sibine stimulea_ caterpillars
may be found feeding on the leaves of a large variety of trees, shrubs,
and other plants. Envenomization usually occurs when the victim
accidentally contacts vegetation infested with these caterpillars. At
the instant the victim’s skin contacts the caterpillar, the spine tips
break off, thus allowing toxin to flow out of the hollow spines and into
or onto the skin.
Avoidance/Control. When working in infested areas, wear gloves, a
long-sleeved shirt, and long pants to prevent accidental envenomization.
During periods of local heavy infestations, children should be
instructed to avoid trees, shrubs, and other vegetation commonly
infested with these caterpillars. Local entomologists may be contacted
to obtain information on the most effective insecticide for saddleback
caterpillar control in a given area.