too ANNALS OF SCOTTISH NATURAL HISTORY^ 



particular tree (Scots fir) ; and on this identical tree I found 

 on 1 4th and 3oth June Plesiodema pinetelhim quite as 

 numerous. It is worth noting that while Pies, pinetelhim 

 was common this year throughout the district, on no par- 

 ticular tree (except this one) was the species numerous. 



Plagiognathus Wilkinsoni, D. & S. Minkie Moss, June, under 

 sphagnum. 



Corixa hieroglyphica, Duf. Perth, North Inch Ponds, 3oth May. 

 Corixa fab ricii, Fieb. Perth, Wild Orchard Pool in April. 

 Corixa condnna, Fieb. Perth, North Inch Ponds, 3oth May. 



Corixa carinafa, Fieb. Dalguise, in April. In pools and hills 



between Dalguise and Dunkeld. 



Strongylocephalus agrestis, Falc. Minkie Moss, October, sweeping. 

 Eupelix ciispidata, Fal. Minkie Moss, August, sweeping. 

 Deltocephalus salmlicola, Curt. Linn of Campsie, May, off wild 



thyme by sweeping. 

 Limotettix nigricornis, J. Sahl. Bankfoot, June, sweeping. 



ON SCOTTISH DESMIDIE^E. 



By the late JOHN ROY, LL.D., and J. P. BISSET. 



\Continued from page 46.] 



PLATE IV. 



49. C. De Notarisii (Wittr.), Nordst. Very rare. Ross Falls of 



Connon ; Kincardine south from Portlethen ; Stirling 

 Fintray Hills. 



50. C. eboracense, W. West. Very rare. Perth Craig-an-Lochan. 



51. C. eJiictiun, Roy and Bisset (" Desmidieer from Bornholm," 



O. Nordstedt, 1888). Very rare. Aberdeen -- Powlair, 

 Heughhead near Aboyne ; Kincardine Crathes, Durris. 

 (Our Plate I. fig. 9.) 



52. C. elt'ga/is, n. sp. Medium sized; unequally hexagonal; sides 



minutely undulated and converging towards the truncate 

 produced and more boldly undulated ends ; minute crenu- 

 lations extend from all the undulations towards the centre 

 of the frond, which appears to be smooth ; constriction 

 narrow, of medium depth ; frond from side view of nearly 

 equal thickness. Length, 43-45 />-; breadth, 28-30 // ; 

 isthmus, 17 IL. (Our Plate II. fig. 5.) 



Very rare. Aberdeen Logie-Coldstone and Glassel. 



