174 UNITED STATES NATIONAL MUSEUM BULLETIN 2 76 



ADULT MALES (males in figs. 291-299).— Color ranging from 

 light yellowish-brown to fairly dark chocolate-brown. Lines on fore- 

 wings varying from dark to light, depending on background color which 

 determines whether the dark line or the narrow lighter border is more 

 conspicuous. Lines with or without indentations along the veins, but, 

 if present, usually not very deep; occasionally deep enough to meet 

 along Cu 2, and rarely deep enough along two veins to cut off an 

 "island." Median area often about same color as inner and outer areas, 

 but sometimes dark enough to form a distinct dark band across wing as 

 in figure 292. Hindwings usually about same color as outer area of 

 forewing, or slightly darker, often crossed by a faint, contrasting band 

 of scales. Lower surface of both forewings and hindwings usually about 

 same color as upper surface or slightly darker; both forewings and 

 hindwings crossed beneath by a single contrasting line which may be 

 faint on hindwing; region inside this line sometimes darker than outer 

 region. Epiphysis variable, ranging in size from about length of second 

 segment of foretarsus to about length of first segment of foretarsus, but 

 often fairly large as in figure 77, If large, however, it does not have 

 disstria's distinctive shape (fig. 75). 



MALE TERMINALIA (figs. 16, 41, 61).— As described for M. 

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



ADULT FEMALES (females in figs. 291-299).— Color usually 

 slightly darker than most males, ranging from light brown to darker 

 chocolate-brown, often with a slight yellowish tint. Lines on forewings 

 appearing light or dark as in the males ; lines usually with some indenta- 

 tions along veins, especially the outer line, but very rarely meeting. 

 Median area generally somewhat darker than inner and outer areas, 

 but usually not strikingly so. Hindwings not noticeably darker than 

 forewings on most specimens. Lower surface of both forewings and 

 hindwings about same color as upper surface, crossed by a single 

 contrasting line which may be faint, especially on hindwings. 



FEMALE TERMINALIA (figs. 93-95).— As described for M. 

 incurvum (page 1 70) and indistinguishable from those of M. californicum 

 which occur in the same area. 



ADULT DIAGNOSIS. — Neither males nor females can be positively 

 separated from populations of M. californicum which occur nearby, but 

 in many areas only i. incurvum is known to occur. Male i. incurvum are 

 usually yellowish-brown to gray-brown or chocolate-brown, and the 

 lines on the forewings often are not sharply contrasting, while male 

 californicum are generally, though not always, more reddish-brown or 

 orange-brown, and the lines on forewings are usually more sharply 

 contrasting. Female i. incurvum are usually a soft brownish color and 

 the lines on the forewings are usually not sharply contrasting, while 



