REVISION MALACOSOMA HUBNER EST NORTH AMERICA 183 

 Malacosoma incurvum aztecum (Neumoegen), new combination 



Clisiocampa azteca Neumoegen, 1893, p. 5. — Ancona, 1930, pp. 215-225. 

 Clisiocampa luteimargo Dyar, 1907, p. 232. Type: Holotype, male, United States 



National Museum Type No. 10447. 

 Malacosoma fragilis azteca (Neumoegen), Dyar, 1928, p. 623, pi. 86b. — Collier, 



1936, p. 114. 

 Malacosoma luteimargo (Dyar), 1928, p. 623, pi. 86b.— Collier, 1936, p. 119. 



Very few specimens have been available for study, but among these 

 there is no great variation except for a few pale yellowish ones (both 

 males and females) which were described by Dyar in 1907 as Clisiocampa 

 luteimargo. However, Ancona (1930) indicated that the color oi aztecum 

 may vary from being uniform brown to light yellow, with many inter- 

 mediate combinations. 



ADULT MALES (figs. 285-287).— Color variable, ranging from pale 

 yellow to dark blackish-brown, darker specimens lightly dusted with 

 pale scales. Lines on forewings dark on yellowish specimens; lines on 

 darker specimens appearing light or dark, depending on the back- 

 ground color. Lines often with a few small indentations along the veins, 

 but not deep enough so they meet to cut off "islands." Median, inner, and 

 outer areas about same color; median area sometimes slightly darker, 

 inner area sometimes slightly lighter. Hindwings about same color 

 as median band on forewing, usually unmarked, but occasionally 

 crossed with a faint, contrasting line. Lower surface of both forewings 

 and hindwings about same color as upper surface; both forewings and 

 hindwings crossed by a single contrasting line which may be faint; 

 pale specimens may have the region inside this line darker than the 

 outside region. 



MALE TERMINALIA (figs. 18, 43, and 63).— As described for Af. 

 incurvum (page 170), and indistinguishable from those of Af. calijornicum. 



ADULT FEMALES (figs. 288, 289).— Color varying from yellowish 

 to medium brown to dark chocolate-brown. Lines on forewings light 

 or dark, usually with some small light indentations, but not indented 

 sufficiently to cut off "islands"; veins sometimes covered with darker 

 scales than surrounding area. Median area usually same color as inner 

 and outer areas, but sometimes darker. Hindwing about same color as 

 median area of forewing. Lower surface of both forewings and hindwings 

 same color as upper surface. Both forewings and hindwings crossed by a 

 single contrasting line, with the region inside the line sometimes 

 darker than outside region, especially on light specimens. 



FEMALE TEP.MINALIA (fig. 96).— As described for M. incurvum 

 (page 170), and indistinguishable from those of M. calijornicum. 



