234 [March, 



hand, and lodge between my fingers, when walking by the sea at Margate, when a 

 strong wind was blowing from the sea. — T. D. A. Cockbrell, Bedford Park : 

 February 2nd, 1885. 



[It has, I think, been incontestably proved that the swarms of CoccineUa 

 occasionally seen on our coasts are formed not of immigrants, but of w^ould-be 

 emigrants, stopped by, and driven back by, the sea, and accumulating by continuous 

 supplies from inland. The masses of dead Aphides that sometimes form tide-refuse 

 on our southern shores result from the same cause. But with regard to Britain 

 generally, immigration is a far stronger factor than emigration, and enables us to 

 include in our lists of British species, especially in Lepidoptera, a good many 

 beautiful insects that are not truly natives. Some of these certainly, others 

 probably, never breed here. Others again breed for a time, but would become 

 extinct were it not for fresh immigration. This latter remark especially applies to 

 our two species of Colias, and it might even apply to that most notorious migrant, 

 Vanessa cardui. — R. McLachlan.] 



Further evidence of the existence of insects in the Silurian period. — In the last 

 number of this Magazine I referred to the evidence afforded of the existence of 

 insects in the Silurian period by the discovery of a fossil scorpion in the upper 

 Silurian rocks of the Island of Gothland. Further evidence to the same effect is 

 furnished by the recent discovery, by Dr. Hunter, of Carluke, of a second specimen 

 of a scorpion, in the upper Silurian beds of Dunside, Lesmahagow, Lanarkshire. 



The discovery of this second scorpion had been reported to me prior to the date 

 of my paper, but no description of the specimen having been published, nor any 

 authentic information about it having been received, I did not allude to it. As a 

 preliminary description of this scorpion, by Mr. B. N. Peach, has lately appeared in 

 "Nature" (January 29th, 1885), this note may, perhaps, not be out of place, as a 

 supplement to my previous communication. — H. Goss, Surbiton Hill : February 

 9th, 1885. 



Destruction of Fish by larva of LibelhdidcB. — In the Hungarian " Rovartani 

 Lapok " for December last, L. Bird states that the larva of LiheUulidce , species not 

 determined, have made such ravages in the piscicultural establishment of M. le comte 

 Palffy, at Szomolany, that in a pond into which in the last spring 50,000 young 

 fishes were put, only 54 could be found in September, but there were then there an 

 immense quantity of the larvee of LibeUulidce. — Eds. 



On the sub-aquatic habits of the imago of Stenopsyche, a genus of Trichoptera. 

 — The genus Stenopsyche, McLach., was characterized in 1865 (Trans. Ent. Soc, 

 5rd series, vol. v, p. 264) from a species from North India {S. griseipennis). Since 

 then the same species, or one very closely allied thereto, has been found in North 

 China, and in Japan. In the latter country it seems to be abundant, and it comes 

 in nearly all collections. My nephew, Mr. W. J. Wilson, recently made a long tour 

 in Japan on his way home from India, and obtained a few insects. Amongst these 

 are a large number of the Stenopsyche in question, and I was induced to question 

 him as to its habits. They were found at the little lake of Yumoto in the main 

 island, at an elevation of about 5000 feet. He says they were abundant before dusk. 



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