1881.] 219 



Trichoptera are chiefly represented by alpine Limnophilidce and Bhya- 

 cophilce. Perhaps the most remarkable of all is Limnophilus subjectus, 

 about the last species I expected to find : originally recorded from 

 Arctic America (and extendirg to Maine in the United States), it has 

 lately been found commonly in Finland and Scandinavia, but its most 

 southerly known distribution in Europe was the south shore of the 

 Baltic ; essentially a boreal species and an inhabitant of districts of 

 little elevation in the north, we find it again in the high Alps at about 

 6000 feet, a striking instance of the affinity that exists between the 

 insects of the north and those of the high Alps very much further 

 south, and under differing physical conditions, excepting the one point 

 of probably equal mean temperature. 



For greater abundance, both in forms and individuals, a lower 

 elevation, warmer water, and richer shelter, are necessary. Yery few 

 of the species found by Professor Zeller at Bergun (about 4550 ft., on 

 the other side of the Albula Pass) were seen, and many of my captures 

 were not represented amongst his. Difference of season may partially 

 account for this, but the main reason is difference of altitude. On 

 my journey from Churwalden I took mental notes on the probable 

 capability of the localities, and the most likely of these appeared to 

 be between the village of Filisur and Bergun, a mile or two from the 

 former. 



The Upper Engadine captures were as follows: — 



TKICHOPTERA* 



Phktganeid^:. 



Phryganea obsoleta (Hag.), McLach. — Not uncommon at the Statzer-See ; it 

 had beon only recorded as Swiss from a specimen caught by Mr. Stainton at Maria 

 in 1870, but at Zurich I found that it occurs near that city, and probably in other 

 localities, the Swiss Entomologists having confounded it with Ph. varia. 



Limnophilid^:. 



Limnophilus rhombicus, Hi. — One ? at the streamlet between the Statzer-See 

 and Lake St. Moritz. Certainly an unusual altitude for this insect : the example is 

 very typical in size and colours, but the appendages (known to vary) are much more 



linear (less dilated at the base) than is usual. L. despectus, Walk. — Two ? ; 



Statzer-See and Yal Bevers, beaten from Pinus cembra (vide supra). 



Acrophylax zerberus, Brauer. — One $ at a torrent between Pontreaina and 

 Samaden ; as yet this is a scarce insect. 



Asynarchus ccenosus, Curt. — The large alpine form was generally distributed 

 and common ; especially so between Pontresina and Samaden, where it was sitting 

 on the " stone posts " mentioned in my notes in Ent. Ann., 1871, p. 15. I suspect 

 the larva? do not affect torrents, but live in shallow, almost standing water, such as 

 is often found by the roadsides. 



* The nomenclature used here is the same as in the Systematic Catalogue in my "Revision 

 and Synopsis." 



