233 



ZYGyENID^E. 



Genus MONOSCHALIS. 



Monoschalis, Hmpsn. III. Het. ix, ined. 



Type, M. virescens, Hmpsn. 



Range. Ceylon. 



S . The antenna? bipectinated. Palpi short and porrect, 

 with no spurs. Fore wiug with, veins 8 and 9 stalked, 

 wing with vein 6 present. 



Tibiae 

 Hind 



495. Monoschalis virescens, Hmpsn. III. Het. ix, ined., pi. 157, 

 fig. 11. 



S • Black, shot with green : abdo- 

 men with 4th and 5th segments yellow. 

 Tore wing with a hyaline spot in end of 

 cell, a large spot below the end ; a bifid 

 submarginal and small spot near outer 

 angle. 



Hah. Colombo, Ceylon. Exp. 22 

 millim. 



Fig. 153. — Monoschalis 

 virescens, tf. \. 



Genus THYKASSIA. 

 Thyxassia, Bull. Journ. Linn. Soc, Zool. xii, p. 355 (1876). 



Type, T. subcordata, "Wlk. 



Range. Plains of 1ST. India, S. India, and CeyloD. 



Antenna3 bipectinated in both sexes, more heavily in the male 

 than the female. Palpi short and porrect. Tibiae with no spurs. 

 Pore wings with veins 8, 9, and 10 stalked together. Hind wing 

 with all the veins from the cell, 8 absent. 



496. Thyrassia subcordata, Wlk. Cat.i,$. 132; C. $ S. no. 280 ; Butl. 

 III. Het. i, p. 19, pi. vii, tig. 5. 

 Thyrassia aurodisca, Hmpsn. III. Het. viii, p. 44, pi. cxxxix, fig. 10. 



Prons, collar, metathorax, and lateral 

 streaks on each abdominal segment orange. 

 Pore wing dark brown ; a yellowish or 

 whitish hyaline spot at end of cell, a trifid 

 spot below it, a bifid or trifid subapical 

 spot. Hind wing with an orange patch 

 occupying the basal inner area and curving 

 up to the costa beyond the cell. 

 T. aurodisca, the southern form, has the orange of hind wing 

 more extensive and the border narrower. 



Hab. Plains of JN". India, S. India, and Ceylon. Exp., <f 24, 

 § 2Q millim. 



Fig. 154. — Thyrassia 

 subcordata, $. \. 



