GEOMETRrD.K—IfEyriTIIEA. 301 



Genus (i. HEMITHEA. 



Antenna' of tlie male sharply serrated, palpi slender, head 

 smooth, but having a transverse furrow ; thorax slender,, 

 smooth ; abdomen slender, furnished with several small 

 crests ; fore wings trigonate, rather pointed ; hind wings 

 angulated behind, scalloped within the cilia. 



We have but one species. 



1 . H. tliyniiaria, L. ; strigata, Staucl. Gat. — Expanse 

 1 to \\ inch. Dull dark green, or greyish-green; on the 

 fore wings two, and on the hind one, undulating transverse 

 white lines ; cilia of all the wings silvery-white, chequered 

 with black-brown. 



Antenna; of the male sharply serrated or notched, ciliated, 

 light brown, white at the base; palpi curved, pointed, red- 

 brown ; face smooth, chocolate-red, banded above by a trans- 

 verse channel ; head rather rough, dull green, but between 

 the antennas white ; thorax narrow, dull green ; abdomen 

 slender, whitish-brown, having two or three obscure brown 

 dorsal crests upon the anterior segments ; lateral and anal 

 tufts brownish-white. Fore Avings moderately broad, some- 

 what triangular ; costa gentl_Y arched, more so toward the 

 apex, which is bluntly angulated ; hind margin gentl}" curved 

 and very faintly crenulated ; dorsal margin a little filled out, 

 ciliated ; colour dull dark green, very minutely dusted with 

 white ; extreme edge of costa brown ; first line very slender, 

 rather oblique and sinuous, faintly white, edged outwardly 

 with darker green ; second Hue somewhat parallel, but more 

 sinuous, slenderly white, edged inwardly with dark green ;, 

 cilia silverj'-white, strongly barred or chequered with black- 

 brown. Hind wings decidedly elongated, rounded in front, 

 but the hind margin produced in the middle into a decided 

 angle or protruding point, and the anal angle squared; of 

 the same dull dark green as the fore wings; central spot a 

 darker green streak ; beyond this, in the middle of the wing, 

 is a sinuous white transverse line, inwardly edged with dark 



