TRIFIDM. 149 



in front of the lobes, dorsal region greyish-green ; sides 

 greener and with a darker green line close to the broad 

 whitish-green spiracular stripe ; the narrow dorsal and sub- 

 dorsal lines of the same whitish-green, but fainter ; the dark 

 raised dots very small ; incisions whitish-green. After the 

 fourth moult the dorsal line becomes distinctly buff-yellow 

 with a black dot on each side of it and another lower down 

 on each segment ; the general colour is now brown or 

 brownish-drab, finely sprinkled with dark brown atoms, 

 black freckles appear above the spiracular stripe, and the 

 head has a black streak in front of each lobe. When some- 

 what older a more brownish-ochreous colour is assumed, and 

 it is only after hybernation that the adult colouring is 

 attained. 



July to March on grasses, Poa neinoralis, P. annua, 

 Brachi/jwdium st/lratimim, Dacti/lis glomcrata, but apparently 

 preferring the two species of Poa ; hiding in the daytime in 

 the thick tufts of grass, feeding at night, when very young 

 only eating one surface of the leaf, when older devouring the 

 grass-blades in the usual' manner. When young very active 

 and vigorous, but before the winter becoming torpid and 

 sleepy, yet feeding a little in the evening. Very delicate 

 and difficult to rear in this climate. Dr. Chapman succeeded 

 by placing each larva in a separate glass jar with a tuft of 

 grass (Poa annua) frequently changed. The bloom or lustre 

 of the skin of this larva is remarked upon by Guenee as a 

 curious velvety appearance which is appreciable to the touch 

 and feels like very fine velvet. 



Pupa smooth and polished, yet sculptured over the back of 

 the thorax, the wing and limb-covers, with very fine im- 

 pressed furrows. Dorsal region rounded, the segments 

 having dorsal and subdorsal hollows as though dented in ; 

 anal segment with a wrinkled black projection rounded at 

 the end and terminating in two almost parallel spines. 

 General colour rich red-brown. In a slight silken cocoon 



