Occasional Papers of the Mitscuiii of Zoology g 



of abdominal segments the female is like the male ; the taper- 

 ing from the base is continued to the apex of 3 ; the diameter 

 of 4-6 in the female is about one-half greater than in the 

 male; as the four apical segments are about the same in both 

 sexes, the widening of these segments is less abrupt and con- 

 spicuous in the female. The ventral median tuft of bristles on 

 I in the male is very weakly develojjed in the female. Legs 

 light dull brown, the tibiae the same color as the femora, or, in 

 bright colored specimens, the tibiae colored as in the male ; 

 the femora with the dark areas somewhat reduced and paler 

 as compared with the male. The female has the spines of the 

 anterior row on the second and third femora larger than in 

 the male; the first femora in the two sexes arc very similar. 



]\Iale and Female. — Stigma black or dark brown, normally 

 covering two and one-half cells. A'enation black, wings clear, 

 usually yellow tinged basally and more rarely along the costal 

 border to the nodus ; in one female smoky tinged throughout 

 about the veins. Antenodals in the front wings, 11; in the 

 hind wings, 9. Postnodals in the front wings, 5 or 6, in about 

 equal numbers, and 7 in one female wing; in the hind wing 

 usually 6 but in one male both hind wings have 5, and in one 

 female both hind wings ha^■e 7. The amount of variability in 

 the postnodals as compared with the antenodals is striking. 

 In the front wings the number of cells on the anterior side of 

 Cuj, which do not reach ^L, is i, rarely 2; and in the hind 

 wing it is 2 in the male, and 2 or 3. in equal numbers, in the 

 female. In the hind wing the number of cells posterior to Cu^ 

 (=:the cells distal to the postanal cells) which do not reach 

 the posterior margin is i, rarely 2 in the male; and 2 or 3, in 

 equal numbers, in the female. 



In the venation of this species the most interesting thing of 

 course is the four-sided triangle. Almost equally interesting is 



