7f, BRITISH MOTHS 



The three following species have the furcation of the postcostal vein of the hind wings slight. 



SPECIES 3.— CERURA FURCULA. T/.ate XV., Fig. 4, .5, G. 



Synonymes. — P/ial. Somb.furcula,hinnxus; Fabricius; Hiibncr; Wilkes, pi. 29, fig. 2 ; Donovan, vol.8, pi. 272; Stephens 



(Cerura f.) ; Wood, In.I. Ent. pi. 5, fig. Ifi. 



This species measures from IJ- to I}, inch in the expanse of its fore wings, which are of a grey colour, spotted 

 at the base as in C. bicuspis ; then follows an ashy-coloured, sinuated bar, ill defined on its outer margin, 

 succeeded by a pale ashy patch, in which are several dusky spots and undulated streaks, and a discoidal 

 lunule ; towards the apex of the costa is an abbreviated dusky patch, terminating in a more distinct blackish 

 wavy streak ; the apex of the wing has a row of black dots ; thorax grey in front, varied witli black and orange 

 behind. 



The caterpillar is green, with a red patch behind the head, and an elongated one down the back (beyond the 

 conical protuberance), margined at the sides with white ; the anal filaments are also red. It feeds on willows 

 and poplars during the autumn, and the moth appears in June and July. 



It is by no means a scarce species, and is widely distributed throughout England. 



SPECIES 4.— CERURA ARCUATA. Plate XV., Fig. 8. 



Snonymes — Centra arcimt/t^ Stephens. 

 Cei: forficula, Fischer, Eiit. Rus. ?? (Boisdnval gives this as identical with fusriniiln). 



This species differs from C. furcula (in the same manner as C. Integra does from C. bicuspis), in tlic integrity 

 of the external margin of the narrow dark fascia in the anterior wings, which is edged witli black as well as the 

 internal margin. It measures ly^ inch in the expanse of the fore wings, which are of a grey colour ; beyond 

 the fascia (which has the hind margin rather angulated in the middle), the fore wings are of uniform colour, with 

 a discoidal spot and two undulated striga; of arched lines, the second of which is strongly marked and black, and 

 terminates in a cinereous subapical patch on the costa ; the thorax is ashy in front. 



A single specimen, taken at Coombe Wood, is in Mr. Stephens's cabinet. It, as well as the next, may possibly 

 be only varieties of C. furcula. 



SPECIES .5.— CERURA LATIFASCIA. Plate XV., Fig, 7. 



Synonymes. — Cerura latifascUi, Curtis, Brit. Ent. pi. 193; Stepliens, Illiistr. ; Wood, lud. Ent. pi. o, fig. 18. 



D'lcranura furcula^ var., Boibduval. 



This supposed species measures rather more than H inch in the expanse of the fore wings, and is distinguished 

 by the great breadth of the broad ashy fascia, varied with orange and margined with black, extending from the 

 costa to the anal angle ; its external margin sinuated. Then follow two indented streaks, inclosing a space in the 

 middle of the wings m.arkcd with several black streaks. The hind wings have a pale brownish subapical band, 

 and another more slender across the middle of the wings. The abdomen is banded with black. 



Mr. Curtis reared his specimen from a caterpillar found in September on a narrow-leaved sallow, near Liiitmi, 

 Nurtli Devon, and the moth appeared in the following Slay; and Mr. Stephens has a specimen found near London. 



