66 STNTOMID^. 



B {Hydrusa). Antennae of male serrate, of female simple. 



a. Abdomen with crimson streaks graduata. 



b. Abdomen with orange or yellow markings. 

 a}. Wings with the markings hyaline. 



a^. Abdomen with seyen orange bands in male, six in 

 female. 

 a^. Fore wing with large hyaline patches in inter- 

 spaces. 

 a*. Fore wing with the veins black, with orange 

 streaks below costa and on inner margin. 



a^. Abdomen with the anal segment black diapha7ia. 



b^. Abdomen with the anal segment orange 



above baiea. 



b*. Fore wing with the veins golden yellow era. 



C*. Fore wing without yellow streaks. 

 a°. Tegulae and ]>atagia orange. 

 a^. Frons orange. 



a'. Hind wing with minute hyaline spots . . . metapkcsa. 

 b''. Hind wing with conjoined hyaline 



patches chlorometis. 



(P . Hind wing with the hyaline patches 



separate huebneri. 



b^. Frons black ; hind wing with large con- 

 joined hyaline patches stcnozona. 



b^. TeguliB and pat agia black hi/alota. 



P. Fore wmg with small hyaline points phcenicia. 



b'^. Abdomen with six orange bands ; wings hyaline, with 



the veins and markings narrowly black serrata. 



c^. Abdomen with dorsal orange patch at base and 



lateral series of points shoa. 



b^. Wings with the markings orange. 



a^. Abdomen with seven bands in male, six in female. 

 a^. Fore wing with four elongate orange spots of 

 almost even length between veins 3 and 7. 

 a*. Wings with the markings semihyaline orange- 

 red ; fore wing with the spots below the cell 



confluent mareUa. 



b*. Wings with the markings pale orange ; fore 

 wing with the spots below the cell not con- 

 fluent pactolina. 



b^. Fore wing with the postmedial spot between 

 veins 4 and 5 small or wanting. 

 a*. Wings with the markings pale semihyaline 

 orange ; hind wing with the markings largely 



confluent aperta. 



b*. Wings with the markings fulvous orange ; hind 

 wiiig with the markings separate or slightly 

 confluent. 

 rt°. Foi'e wing with oblique wedge-shaped spot 



below base of vein 2 annulata. 



b^. Fore wing with small quadrate spot below 



end of cell inmlaris. 



Ir. Abdomen with sis orange bands in male, the two 



terminal segments black antiiheta. 



t;-. Abdomen with five orange bands, the three terminal 

 pogments black, 

 a'. Abdomen with ventral orange bands. 



(?■'. Hind wing with the spot below cell large macroplaca. 



b*. Hind wing with the spot below cell absent or 



minute leucacma. 



