DIAMOND-BACK MOTH. 109 



respectively in Norfolk, Yorkshire, and in the county of Fife, N.B., and 

 some other localities, were sent me in the latter part of May. Notes 

 of caterpillar damage of these larvae being spun up for the chrysalis 

 state were sent on the 20th of June, and no reports of serious mis- 

 chief were forwarded me after the 11th of July, and none at all after 

 the 29th. 



During the summer of 1893, I did not receive any observations of 

 ravage, and scarcely any of the appearance of this attack ; nor was 

 there any report given by the agricultural press of continued visitation 

 of the pests; and on communicating with Mr. E. A. Atmore, F.E.S., 

 of King's Lynn, Norfolk, in which district the Diamond-backs had 

 been very observable in 1891 and 1892, he wrote me as follows : — 

 *' Plutdla cruciferarum, Z., the Diamoud-back Moth, has been con- 

 spicuous by its absence (so to speak), for I have only seen two 

 specimens, imagines" {i.e., in moth condition — E. A. 0.), "during the 

 whole year, and no traces of the larvae on Turnips, &c." — (E. A. A.) 



It has seemed worth while to allude again to this infestation, which 

 excited so much attention on its great outbreak in 1891, relatively to 

 the possibility or great probability of it having been wind-borne from 

 Norway, where, as we now kuovv from the list of the ' Norwegian 

 Lepidoptera,' * published by the State Entomologist, Dr. W. M. 

 Schoyen during the past year, this species, the P. cruciferarum, is very 

 widely distributed. 



In this revised Catalogue, bringing the list of Norwegian Lepidop- 

 tera up to present date. Dr. Schoyen has tabulated the distribution of 

 species in parallel columns, with the names of the provinces (or main 

 districts, as Chiistiansand, Tromso, Finmark, &c.) in which their 

 presence has been recorded, and the latitude of their most southerly 

 and northerly observation. 



From this it appears that the Plutella cruciferarum, known by us 

 as the " Diamond-back Moth," has been recorded as present in all the 

 eighteen main divisions of Norway, except Biatsberg and Bergenhus 

 (N. and S.). Its distribution is from latitude 58° N. (that is, from the 

 southernmost extremity of Norway), to 70° 42' N., that is, further north 

 than Hammerfest, and only a few miles short of the extreme north of 

 the mainland of Norway, or, one might say, to the extreme north, as 

 the few miles left are so indented with fiords, or arms of the sea, as 

 really to leave very little land at all. 



The above notes, taken from a work of authority and careful com- 

 pilation, appear to me well worth observation in connection with 

 insect appearances coincidently with easterly or north-easterly winds. 



* Tortegnelse over Norges Lepidoptera,' af W. M. JSchoyen. (Christiania 

 Videnskabs-Selskabs Forhandlinger for 1893, No. 13). 



