ANNALS OF SCOTTISH NATURAL HISTORY 



remarks bearing on the subject by two Continental 

 Entomologists of repute. 



My valued correspondent and friend, Dr. Ris of Rheinau, 

 Switzerland, records (" Mitt. Schweiz. Ent. Ges.," Bd. 9, 

 Heft 10, p. 441) that he captured Chcetopteryx Gcssneri, 

 a Trichopteron, at Airolo on 27th and 28th September, 

 while the insect did not appear for about a week after at 

 the lower locality of Mendrisio. In connection with this, 

 Dr. Ris makes the general statement : " Die Spatherbstthiere 

 im milden Tiefland in der Regel spater erscheinen als in 

 rauhern Gebirge." 



In response to inquiries whether the experience of 

 Swiss Lepidopterists agreed with his own, Dr. Ris had the 

 goodness to send me data regarding the times of appearance 

 of certain Lepidoptera in different Continental localities. 

 These were kindly provided by Dr. M. Standfuss of Zurich, 

 and the information seems to me to be so interesting that I 

 give it here in full : 



Dr. Ris adds that, notwithstanding the difference of 

 altitude, the climate of Zurich is very much milder than that 

 of the Silesian plains. Parchwitz may be confronted with 

 the Riesengebirge, and Zurich with the Alps. 



It requires little reflection to see the advantage, or even 

 necessity, of the early appearance of late autumnal species 

 in higher latitudes and altitudes. They must appear while 

 they may. It is perhaps more interesting, because the 



