14 
Psyche 
[March 
devoid of setae in all forms studied. A single stellate seta rather 
than three (or four) is found on each antennal tubercle, flanked 
by (usually) one large stout seta anteriorly and one posteriorly. 
Terminal digging teeth on abdominal segment nine are lacking. 
The second instar larva is intermediate between first and third 
instars with respect to most ontogenetically variable morphological 
features. Three stellate setae are borne by each antennal tubercle. 
The generic discussion applies equally well to the species U. mex- 
icana. It is considerably more difficult to distinguish among species 
in the first instar than in later instars, although the morphology 
of the long setae bordering the head and covering the body and scoli 
seems to separate first and second instar U. mexicana larvae from 
those of at least one undetermined species from Florida. Addition- 
ally, consistent differences in the pigmentation patterns of the dor- 
sum of the head capsule can be found in early instars. However, 
other setal patterns uniquely characterizing mature U. mexicana 
larvae are absent or unreliably present in younger individuals. 
LARVA OF ASCALOPTYNX FURCIGER (McLachlan) 
(Refer to figures 5-7) 
Generic Description: Ascaloptynx Banks. 
The following description is based upon examination of 67 third 
instar larvae reared from field-collected eggs that were morpho- 
logically matched with eggs obtained from females of Ascaloptynx 
fur tiger. A. fur tiger is the only species of the genus that has been 
sighted or collected from the vicinity of the egg collecting sites in 
the Chiricahua Mountains. Two additional specimens of an un- 
identified larva from Pima, Arizona that can be assigned with con- 
fidence to the genus on the basis of morphology were also available 
for comparison. In addition, the two figures published by Peterson 
(1953) are almost certainly of Ascaloptynx larvae, although the 
drawings are too schematic to contribute much morphological 
information. 
Length: just prior to pupation, 16-22 mm, not including jaws. 
Head: quadrate, slightly wider than long, slightly broader pos- 
teriorly than anteriorly but basically parallel sided; strongly flat- 
tened dorso-ventrally but thicker behind than in front. Moderately 
cordate postero-lateral (occipital) margins. Labral margin (LmM) 
wide and weakly bilobed with a narrow tubercle-flanked notch at 
