NOTES ON BRITISH LEPIDOPTERA. 101 



Entomologists who have, within my knowledge, reared both 

 species from the eg'g — indeed I have, myself, bred them from 

 the egg, side by side, with the same result as that mentioned 

 by Mr. D'Orville. Since the article to which I have 

 alluded was penned, Mr. Doubleday has pointed out to me 

 excellent and constant distinctive characters which exist in 

 the hind-wings of the perfect insects: thus in C.ferrvgata 

 the hind-wings present a more or less mottled appearance 

 from ofreater contrast between the o;round colour and mark- 

 ings, while in C. unidentaria they have a confused, somewhat 

 unicolorous, look : the darkest shading of the hind-wing in 

 C. ferrvgata is at the hind margin, which is, as it were, 

 deeply bordered, but in C. unidentaria, on the contrary, the 

 base of the hind-wing is the most darkly shaded part — the 

 transverse lineations across the middle are much more strongly 

 marked in C.ferrugata than in unidentaria, &c. &:c. 



The above distinctions between these species hold good 

 even when specimens closely approximating in colour are 

 opposed, so that this question may now be looked upon as 

 settled. 



CiDARIA (?) SAGITTATA. 



The larval state of the above geometer is now no longer 

 doubtful, Mr. Buckler, of Emsworth, having reared the 

 perfect insects from the larvae from which the excellent de- 

 scription, in last year's "Annual," was taken (Ent. Mo. 

 Mag. vol. i. p, 71). The next business will be to "locate" 

 this species. 



CiDARIA IMMANATA and C. RUSSATA. 



A careful diagnosis, aided by woodcuts, of these frequently 

 confounded species has been given by the Rev. John Hellins, 

 assisted by Mr. Doubleday, which completely sets the matter 

 of their specific distinctness at rest (Zool. 8986). These 



