GEOMETRID.Ti. CUOCALLIS, 161 



Rufous, with obscure darker irrorations ; anterior wings with a straight, oblique 

 striga before, and a second slightly arched one behind, the middle, the latter 

 bordered outv/ardly with whitish ; between it and the apex a blackish spot, 

 united to a snow-white one, and a fuscous one between the strigae : posterior 

 wings rather paler, with a central fuscous spot and a transverse fuscescent 

 striga. Female generally paler. 



Extremely variable, some specimens being bright rufous and unspotted, others 

 the same, and thickly speckled and clouded with fuscous, with the transverse 

 strigLe on the anterior wings very dark and broad, sometimes parallel and 

 distant, at others nearly or totally united on theinner margin— the last variety 

 forming the Ge. bifidaria of Haworth: the ground colour is occasionally 

 griseous or ochraceous, and the strigae nearly obliterated : — the female is gene- 

 rally smaller, with the wings narrower than the male; but I possess a gigantic 

 specimen, nearly half an inch wider than the largest male I ever beheld. 



Caterpillar griseous, varied with brown and white, with two reddish tubercles 

 on the penultimate segment, and two spots of the same colour on the first, 

 which is bordered with reddish on the sides of the head : — it feeds on the 

 oak, horn-beam, beech, &c. : the imago appears towards the beginning of 

 October. 



Not uncommon in the woods throughout the metropolitan di- 

 strict. " Black-hall-woods." — T. C. Heysham, Esq. " Alderley, 

 Cheshire."— 7? ft». E. Stanleij. " Epping."— Mr. Douhhday. « Mel- 

 don-park." — G. Wailes, Esq. 



Genus CLXXIII. — Crocallis, Treitschke. 



Palpi projecting beyond the forehead, very pilose, with the apex squamous and 

 pointed, triarticulate ; maxillw obsolete. AntenncE moderate, shortly bipecti- 

 nated to the apex in the males, the pectinations shortening towards the tip, 

 deflexed and curving inwards, simple in the females : head pilose, round : 

 thorax very robust, woolly : ivings rather broad in proportion to their length, 

 all with the hinder margin slightly denticulate, and with a dark central dot; 

 anterior with two transverse strigae : abdomen moderately stout, with an anal 

 tuft in the male, robust and slightly acute in the female. Larva with 10 legs, 

 cylindric, rugose, not tubercular, with a few scattered hairs : head as large as 

 the anterior segments, a little depressed anteriorly : changes in a cocoon on 

 the ground amongst moss or leaves. 



Crocallis, although an insect of great bulk, differs from the allied 

 genera by totally wanting the maxillae : the wings are broader and 

 stouter than in Himera, and less angulated than in Odontopera or 

 Geometra. 



