?6 Transactions. — Zoology. 



the wings, aud tliey rest ou tree-trunks or rock-faces with their 

 wings flatly spread out, the inner half of the hindwings not 

 being covered by the forewings, and sharing the colouring and 

 markings of the forewings. The neuration of the forewings also 

 serves readily to distinguish this genus, for usually in the fore- 

 wings of our Geometrina twelve veins can be counted along the 

 margin ; but in this genus, and in the next to it, — namely, 

 Elvia — the eleventh vein coalesces with the twelfth and appears 

 only as a short bar from the upper side of the small cell to the 

 twelfth vein, so that only eleven veins appear on the margin. 



Pasiphila lichenodes. 



Expanse, 16-19 mm. General description : Ground colour 

 glaucous-green, with finely crenulated black lines, and two 

 conspicuous, irregular, transverse bands of light brownish- 

 red or chocolate colour, one near the base, the other near 

 the hindmargin. 



Detailed description : Forewings with slightly arched 

 costa, hindmargin with a slight swelling or convexity about 

 the middle, not creuulate ; ground colour glaucous-green, 

 becoming paler with exposure. Basal area very pale pinkish 

 or reddish-brown, bordered by a black line sharply angulated 

 at the middle, and followed by a broad pinkish or reddish- 

 brown band, also bordered on the outer side by a black line. 

 This band is contracted about the lower side of the cell, so 

 as to be nearly divided into two unequal blotches. The 

 centre of the wing is occupied with a broad belt of the 

 glaucous-green ground colour, boldly angulated about the 

 middle of the outer side. This central belt is occupied with 

 three finely crenulated black lines, which are so closely 

 placed that they seem almost to divide the central belt into 

 imbricating green scales edged with black. The central belt 

 is also bordered along the outer edge by a black line. 

 Betw^een the central belt and the sub-marginal line is another 

 broad belt, of a chocolate or reddish-brown colour, sometimes 

 divided into two unequal blotches by the angulation of the 

 outer side of the central belt. This reddish-brown band is 

 crenulated on the outer side and edged with a pale sub -marginal 

 line which follows the crcnulations. Between this and the 

 margin the ground colour appears without any distinct 

 markings. The black lines of the forewing are sometimes 

 edged with paler lines. The hindmargin is edged with an 

 intcnupted black line. Fringe fuscous and pale alternately. 

 Hindwings with a distinct convexity, rather below the middle 

 of the hindmargin. Inner half with colour and markings 

 similar to those of the forewings. Outer half paler, greyish 

 or whitish, markings not so distinct. Below, the forewings 

 are fuscous, with a few of the black lines showing along 



