194< [February, 



NOTES ON THE TEICHOPTERA OF UPPER CLYDESDALE. 

 BY KENISTETH J. MORTOX. 



The following notes may be interesting, as giving some idea o£ 

 the species of Trichoptera occurring in a district, the insect fauna of 

 which is very imperfectly known. Limited spare time has restricted 

 my collecting operations to the immediate vicinity of Carluke ; all the 

 species referred to below having, with the exception of one or two 

 from Lanark Loch, been taken within a radius of three miles around 

 this place. 



The physical conditions of the area just indicated, are almost as 

 diversified as could be expected within such narrow bounds, elevations 

 ranging fi-om about 200 ft. at the level of the Clyde, to over 1000 ft. 

 in one part of a high-lying moorland tract. The Clyde, near here, is 

 a moderately swift river (interrupted here and there with more slowly- 

 running reaches), running through a warm and sheltered valley : in 

 the two miles or so of its course, which I have worked, I have taken 

 no fewer than forty species of Trichoptera. Several of its tributary 

 burns intersect the district, and these are also tolerably rich ; but their 

 productiveness is evidently impaired in some parts by the water 

 pumped from mines being discharged into them. But ponds and 

 marshes are not very frequent, they almost all occur in the higher- 

 lying parts, and are of sm.all extent : there is a fair representation of 

 the species affecting water in such conditions, but the dearth of in- 

 dividuals is marked. Lanark Loch, distant about six miles from here, 

 doubtless jjroduces a number of lacustrine species, but I have only 

 been able to visit it on two or three occasions. It may be mentioned 

 that limestone (the presence of which, as Mr. McLachlan has pointed 

 out has a favourable influence on aquatic insect-life) is abundant in 

 the Carluke district. 



The Phnjganeidce are represented by three species : Neuronia nificriis, Scop., one 

 specimen ; Pkryganea striata, L., frequent at one pond ; and Fh. obsoleta, McLach., 

 common at most standing wat-ers : the specimens larger and darker than others from 

 the North of Scotland, which I possess. 



Colpotaidius incisus, Curt., occurs in suitable places, but I have taken but few 

 specimens. 



Lhnnophilus rhomhicus, L., rare. L. marmoratus, Curt., one specimen. L. 

 stigma, Curt., rare. L. lunatus, Curt., centralis, Cm't.,and vittatns, F.,are common. 

 L. auricula. Curt., common in the fir woods around Lanark Loch ; also taken in a 

 wood near Carluke. L. griseus, L., one specimen, several years ago, but the species 

 has not been seen since. L. extricatus, McLach., frequent, flies at dusk. L. luridus, 

 Curt., one specimen. L. sparsus, Curt., frequent. L.fuscicoi-nis, Ramb., two speci- 

 mens, one on the Clyde, the other at a deep pond. 



