236 The Scottish Naturalist. 



2. Clyde. — The part drained by the Clyde and other rivers 

 between Culzean Castle and Loch Awe; includes Arran and 

 Islay. 



3. Argyle. — The part drained by rivers between Lochs Awe 

 and Aylort ; includes Mull, Tiree, and adjacent islands. 



4. West Ross. — The part drained by rivers between Loch 

 Aylort and Cape Wrath ; includes Skye. 



5. Hebrides. 



An attempt has been made to show the degree of scarcity or 

 abundance of each species, followed by an indication of the condi- 

 tion of water affected by it in its preparatory states, in the 

 neighbourhood of which the perfect insect may usually be found. Be 

 it remarked, however, that many caddis-flies — such for example, as 

 the species of Stenophylax, certain Limnophili, and others — are 

 essentially nocturnal and very retiring in their habits, and thus 

 their rarity may be more apparent than real. As regards habitats, 

 the indications given must not be applied too rigorously, as some 

 species can accommodate themselves to slightly differing condi- 

 tions — for instance, a species ordinarily a pond-frequenter may 

 sometimes occur about slowly running streams ; besides, the larger 

 species possess strong powers of flight, and may often be found in 

 fir-trees, &c, long distances from water of any kind. 



It is to be regretted that, for some of the districts, we have been 

 unable to obtain any information whatever, and for others the re- 

 cords are very meagre. It has not been considered advisable, in 

 the present state of our knowledge of the distribution of these 

 insects, to indicate the probable occurrence of a species in any dis- 

 trict in which it has not been taken. 



Much remains to be done before we have anything like an 

 accurate knowledge of our native caddis-flies, and this can only be 

 considered a preliminary list ; it is hoped, however, it may have 

 the effect of turning the attention of Entomologists resident in 

 Scotland to this much neglected and interesting group, as well as 

 to the other divisions of the Neuroptera. Caddis-flies may easily 

 be taken along with Lepidoptera, and should be set in precisely 

 the same way. 



To make the list as complete as possible, Lepidopterists and 

 others would confer a great favour by sending us any odd speci- 

 mens they may have beside them, or may take during the coming 

 summer, with a note of the localities whence procured; these 

 would be taken good care of, and returned in due course. 



The nomenclature used is that of the systematic catalogue in- 



