GEOMETRID.iE.— CHLORISSA. 315 



The black fascia on the wings is frequently wanting, and an irregular patch is 

 frequently attached to the second ovate spot of the anterior wings on the disc : 

 in some instances there is a row of whitish dots, or a white striga, between the 

 dark margin and the cilia of the anterior wings, and the posterior wings are 

 occasionally immaculate. In some cases the central fascia is continuous, and 

 I possess a specimen with one of the anterior wings nearly all black, and one of 

 the posterior with an abbreviated fascia on the inner edge, the opposite one 

 being without, and the other anterior wing not usually dark. 



Extremely abundant in woods within tlie metropolitan district 

 from May to August. " York.'' — W. C. Hewitson, Esq. " Cum- 

 mersdale, Tarn Wadling, &c." — T. C. Hei/sham, Esq. " Weston- 

 on-the-green ." — Rev. J. H. Matthews. " Raehills." — Rev. W. 

 Little. " Epping." — Mr. Douhleday. " Swaifham Prior.'" — Rev. 

 L. Jenyns. 



Genus CCXXXVIII. — Chlorissa * mild. 



Palpi slender, extending beyond the forehead, approximating at the apex, 

 sparingly clothed with short scales, the terminal joint exposed, sometimes 

 very slender and acuminated; triarticulate ; basal joint very short; second con- 

 siderably elongated; terminal linear-acute, sometimes ovate, acute: maxilla 

 rather long. Antenna; short, rather stout, and furnished with long cilia nearly 

 to the apex, or with shorter cilia their whole length in the males, simple and 

 slightly pubescent within in the females : head broad : eyes globose : thorax 

 slender: wings entire, placed in a triangle during repose; the anterior with 

 the apex acute and their hinder margin slightly rounded, the posterior with 

 the middle of the same margin produced into an angle ; colour green, with two 

 pale transverse strigae: body slender; stouter and more acute in the females: 

 legs variable ; posterior tibice in the males more or less incrassated, furnished 

 with one or two pair of spurs : posterior tarsi sometimes abbreviated. 



Larva smooth, elongated ; head biiid : pupa enveloped in a fine web. 



From the Hipparclu and other green species of this family, the 

 present genus may be distinguished by having the posterior wings 

 distinctly angulated, and the antennae of the males either slightly 

 ciliated their entire length, or subpectinated nearly to the apex : 

 the posterior tibiae also offer another point of distinction. 



A. Posterior tibice of the males with one pair of spurs at the apex; of the 

 females with one pair at the apex, and a second in the middle. 



* XXa^i^M, vireo. 



y2 



