524 CALIFORNIA ACADEMY OF SCIENCES. 



the second lateral suture. Abdomen greenish -yellow, 

 3-8 with a black stripe on the mid-dorsal and on the lat- 

 eral carina?, confluent posteriorly to form a transverse, 

 apical band, 9-10 entirely black except at articulations; 

 or the lateral black bands on 4-7 widened, united at base 

 with mid -dorsal stripe, 8-10 black — intermediate forms 

 connect these two extremes. 



Superior appendages as long as 9-I-10, dark brown, 

 acutely-pointed, with about four inferior denticles in the 

 third fourth of their length. Inferior appendage about 

 one-sixth shorter, yellowish except the edges and apex 

 which are black, triangular, reaching beyond the denti- 

 cles of the superiors. Anterior lamina with margin en- 

 tire. Hamule more prominent than adjacent parts, not 

 bifid, but with an external basal tubercle which may rep- 

 resent the outer branch of other genera, apex acute, 

 slightly hooked externally. Genital lobe oblong, of near- 

 ly uniform width, apex rounded. 



S ? Brownish-yellow on base of front and hind wings 

 reaching at most to the first antecubital, often not so far; 

 the dark brown streaks on the hind wings between the 

 subcostal and median and the submedian and postcostal 

 veins not apparent, or but faintly visible in a few individ- 

 uals. Front wings with 12-15 antecubitals, 7-11 postcu- 

 bitals. 



$ Black stripes on lateral carinee of 3-8 wider than in 

 S . Appendages black, longer than 10, a little more 

 than half as long as 9, straight, simple, apex acute; anal 

 tubercle half as long as the appendages. Vulva marked 

 by a distinct semicircular notch at apex of sternum of 8, 

 9 with a well-marked, mid-ventral longitudinal keel. 



Generic variations noted : the last antecubital contin- 

 uous in one wing only of two females ; discoidal triangle 

 of 3 cells in one wing of one male, in all others, both 

 male and female, 2-celled. 



