18!I8.] 107 



most ordinary type. There seemed to be reason to hope that the 

 remainder of the pupae were living, and they remained where I had 

 previously kept them — against the north wall of the house — a suffici- 

 ently cool place. The next spring (April, 1897) half a dozen more 

 moths emerged, every one of them handsome and of fuller deep 

 green, black, and brown-black colouring. Still there appeared to be 

 living pupee, and they were left undisturbed, with the result that 

 within the last few days have appeared three specimens much darker, 

 jet-black mixed with green-black, and except the green indented 

 transverse lines, with very little paler colour about them, I think 

 among the handsomest I have ever seen. This seems to be a striking 

 instance of intensifying of colour in accordance with duration of the 

 pupal stage. 



39, Linden Grove, Nunhead, S.E. : 

 April 8th, 1898. 



TWO NEW HYDROPTILIDM FROM SCOTLAND AND ALGERIA 

 RESPECTIVELY. 



BY KENNETH J. MORTOiST, F. E. S. 



Since the summer of 1896 I have had in MS. the description of 

 a new Hydroptilid, taken by Mr. J. J. P. X. King and myself near 

 Aviemore in that year. It seems undesirable to delay its publication 

 longer. 



At the same time I give a description of another new species 

 taken by Mr. Eaton in Algeria. This species forms part of a further 

 collection of these insects sent by Mr. McLachlan, and containing 

 additional examples of several of the species mentioned at p. 102 (2), 

 vol. vii, but apparently nothing else new, although one or two isolated 

 females remain doubtful. 



Hydeoptila sylvestris, n. sp. 



Antennae variable, usually pale, with a long median and a shorter subapical 

 fuscous space. Vertex densely clothed with yellowish-white hairs. Legs testaceous, 

 with pale pubescence ; posterior legs with long, silky, greyish fringes. Fore-wings 

 blackish (probably becoming, as in other species, brownish with age), with yellowish- 

 white hairs, which are partly grouped into vague interrupted fasciaa, median, sub- 

 apical and apical, the interruption of the apical fascia forming a strongly marked 

 black pencil at the extreme tip of the wings ; anterior fringes dense and black, save 

 where interrupted by the pale fasciae ; posterior fringes long, iridescent, dark grey 

 interrupted with white. Posterior wings grey, iridescent, with concolorous fringes. 



