54 
Psyche 
[March 
raise additional hell with these subtle color characters, but no matter: 
the genitalia (q.v.) last and last. 
Male scent-spreading sex characters . — Males of limpia , like 
those of nessus, have a narrow costal fold on the primary and a 
metathoracic system of ventral pouch and tibial tufts. The meta- 
thoracic pouch of limpia (fig. 2B) bears short linear scales over most 
or all of its dorsal surface (except at the lateral margin). In nessus 
(fig. 2A), linear scales are altogether absent (particularly in Arizona 
males) or, if present (as in Texas males), are much less dense and/or 
proximal in distribution; even in extreme cases, they never attain 
the distal apex of the pouch, and the pouch is therefore clad — en- 
tirely or for its greater part — with much broader, flat-lying shingle- 
like scales (cf. figs. 2A and 2B). Because the linear scales of limpia 
are creamy, whereas some to all of the broad shinglelike scales of 
nessus are gray to brown, the general color of the dorsal surface of 
the metathoracic pouch differs in the two species. (Interior morphol- 
ogy of costal folds has not been studied.) 
Fig. 2. Metathoracic pouch of the male; abdomen removed, dorsopos- 
terior view. A. Celotes nessus from Austin, Travis County, Texas, V-26- 
1966 (J. M. Burns). B. Celotes limpia, a paratype reared out IX-10-1966 
from a larva collected on Abutilon malacum, 15 mi. SE Redford, 2500 ft., 
Presidio County, Texas, VIII-18-1966 (R. O. Kendall). 
Male genitalia. — Fig. 4. Although basically similar to nessus 
(fig. 3), there are abundant differences, of which the most salient 
include the following. ( 1 ) In limpia , a long thin flattened projection, 
like a curved spatula, arises from the dorsoposterior rim of the body 
of the valva and starts dorsad but at once curves caudad, extending 
far back to become the caudalmost valval element and to end in a 
