185 



pale yellowish patch on its inner side; third line yellow- 

 ish and indented, central spot black. The antennse are 

 pectinated. 



Localities for this species are London and Chelsea. 



The situations where it is found are buildings in which 

 there is old timber. 



The perfect insect appears in June. 



The caterpillar is dull blackish, with raised reddish 

 spots covered with bristles. 



The date of the appearance of the caterpillar is in July. 



It feeds on the lichens and fungi which grow on de- 

 cayed wood. 



The chrysalis is found under the ground. 



GEOMETRIC. 



PSEUDOPTERPNA CYTISARIA. 



GRASS EMERALD. 

 Plate XXI. Figure 10. 



THIS insect measures from an inch and a quarter to 

 nearly one inch and three quarters in expanse. 



Male: pale dull green; the first line dark greenish-grey, 

 nearly straight across, but somewhat waved; second 

 line also dark greenish-grey, indented and bent; third line 

 whitish, but sometimes hardly visible; central spot dull 

 green, but very indistinct. Hind wings paler dull green, 

 crossed with a whitish line behind a darker one, following 

 some way within the outer margin. The antennae are 

 slightly pectinated. 



