88 [April, 



bourhoods where Perlidce are found ? Assuming that the larger species require a 

 certain large percentage of oxygen as a minimum within a given period for respira- 

 tion, the Scottish shore waters in question must be cool enough to hold this in 

 solution throughout the year. But along the margins of Swiss lakes the water in 

 summer is apt to become decidedly warm, and consequently the percentage of oxygen 

 which it contains is likely enough to be reduced below the minimum necessary for 

 these insects. But where (as at Q-eneva, Lucerne, &c.) water issues from a lake 

 with rapid flow, provided the reduction referred to be not excessive, species unable 

 to live in the lake might find the same water habitable ; because the swiftness of the 

 current would subject the insects to what amounts to accelerated respiration. A 

 larger reduction even, up to a certain limit, could be compensated for by a mechanical 

 admixture of air with the water. Therefore, where large Perlidce live in a lake, the 

 thermometer would probably always indicate a relatively low temperature ; and in 

 hot countries the water of rivers may be found at too high a temperature for them 

 to exist, even in a brawling shallow or a boisterous rapid. — A. E. Eaton, Biskra, 

 Algeria : March 1th, 1894. 



Cloantha perspicillaris at Norwich. — Some time ago I received from Dr. E. W. 

 Carlier, of Edinburgh University, a box of Lepidoptera for determination, part of 

 them taken in Scotland, others at Dr. Carlier's home at Norwich. Among them I 

 was much surprised to find a beautiful specimen of the excessively rare Cloantha 

 perspicillaris, L. Upon communicating with Dr. Carlier, he replies that he caught 

 it one night in the summer of 1892 sitting upon the ironwork of a gas lamp in the 

 Unthanks Road, in the outskirts of Norwich. The moth had chosen a spot which 

 is not usually very productive, having only fields and market gardens with low 

 hedges near it, and no trees for some distance. This specimen would thus have 

 occurred in the same season as that secured at Shorncliff by Lieut. Brown. Among 

 the extremely few previous records is one at Yarmouth many years ago, taken, if I 

 remember right, by Messrs. Paget. — Chas. Q-. Baeeett, Nunhead : March, 1894. 



Plusia moneta at Tonbridge. — It may be worth recording that I captured a 

 single specimen of this moth (rather worn) in our garden at the flowers of Nicotiana 

 afflnis on or about the 10th of July last. I had it unnamed in my collection till the 

 other day, when I came across the moth figured in the " Entomologist " for 1890. 

 To make quite sure I was not mistaken, I showed the moth to a son of Mr. Dallas 

 Beeching, of Tunbridge Wells, who confirmed my opinion. — P. L. Babington, 

 "W aimer House, Tonbridge : February 2&th, 1894. 



Early appearance of Pieris rapce. — On March 9th a perfect specimen of this 

 butterfly fluttered in at our kitchen window ; it did not seem very strong on the 

 wing, and had evidently just emerged. I at first thought it must have pupated just 

 outside, and so been, to a certain extent, " forced " by the heat from within ; but I 

 could not find any trace of its chrysalis, and I do not see how the larva could have 

 got there.— Id. : March 11th, 1894. 



TJte supposed new British species of Diastata. — I see that in the last number 

 (page 64) of this Magazine Mr. Beaumont has recorded three species of Diastata, 



