REVISION MALACOSOMA HUBNER IN NORTH AMERICA 103 



figure 162 so an acute angle is formed; median area same color as 

 inner and outer areas. Hindwing often darker than forewing (especially 

 those from Texas), but sometimes same color, and sometimes crossed 

 by a brown band, as in figure 162, which may be distinct or faint. 

 Lower surface of forewings usually darker than lower surface of hind- 

 wings, forewings usually with a brownish line crossing them, hind- 

 wings sometimes with a brownish line crossing them which is most 

 noticeable in those specimens with conspicuous lines on the upper 

 surface of the forewings. Rarely, specimens may be found which are 

 pale straw-yellow and with very faint markings (see fig. 171 and 

 "comments"). Epiphysis small, about the length of second tarsal 

 segment of foretarsus. 



MALE TERMINALIA. — Posterior edge of seventh sternite not 

 distinctive (fig. 59), varying from heavily sclerotized and with small 

 "teeth" to practically nonsclerotized and smooth. Genitalia (fig. 32) 

 most similar to those of M. constrictum (fig. 34), but more "robust," the 

 "arms" of the eighth sternite (fig. 39) parallel or only slightly con- 

 verging; distance between points of the "arms" usually greater than 

 half the basal width of eighth sternite at its widest point. Prongs of 

 accessory claspers (fig. 14) visually very thick, unevenly tapered and 

 blunt, jagged or toothed at apex as though they had been broken off. 

 Some specimens (including the lectotype) have evenly pointed accessory 

 claspers. 



ADULT FEMALES (females in figs. 161-175).— Color usually 

 fairly dark reddish-brown in reared specimens from Texas (figs. 169 

 and 175), but lighter specimens may be more common in other areas 

 (figs. 163 and 166). Forewings heavily dusted with yellowish scales 

 which are apparent to the unaided eye. Lines on forewings reddish- 

 brown, outer one usually fairly straight, inner one more variable; 

 median area nearly always darker than inner and outer areas. Hind- 

 wings about same color as darkest area of forewings. Lower surface of 

 wings about same color as upper surface of hindwings, inner area on 

 lower surface of both forewings and hindwings sometimes darker than 

 outer area. As in the males, rare specimens may be found which are 

 pale straw-yellow, and with only faint markings (see fig. 172 and 

 "comments"). Epiphysis very small or absent. 



FEMALE TERMINALIA.— Genital plate varying from partially 

 sclerotized to nonsclerotized. Ovipositor as in figures 84 and 85. See 

 the following section for a discussion of ovipositor characteristics. 



ADULT DIAGNOSIS.— The only males likely to be confused with 

 tigris are those of M. disstria and M. constrictum since both have dark 

 lines on a light ground color. Male disstria are easily separated by the 

 characters of the epiphysis and genitalia given in the diagnosis (page 



