Collembola and Thysanura of the Eclinhurgh District. 251 



Isotoma cinerea (Nic). 

 [Plate VIII. Figs. 1, 2.] 



We have not met with this inconspicuous form often, but 

 it will yet be found, no doubt, in most parts of the district. 

 Beyond the limits of our present area we have collected it 

 near Comrie, in Mid-Perth. Prof. Eeuter kindly named 

 some of our first specimens for us, and others have since 

 been examined by Dr Schiiffer. The fourth or ventral tooth 

 of the mucro (Fig. 2) is sometimes only slightly developed, 

 or even absent altogether. 



The species is common on the Continent, ranging from 

 Scandinavia and Finland to France, Italy, Bohemia, and 

 Hungary, and it has also been brought from Siberia. Schott 

 is evidently in error in supposing it has been recorded from 

 England by Lubbock. 



Local data. — Cullalo (Fife), 3rd April 1897, common under moist bark on 

 a dead spruce ; Dreghorn (Midlothian), Feb. 1898, many under bark on old 

 logs ; Bush, near Eosslyn, March 1899, a few under bark on fir logs. 



Isotoma fimetaria (Linn.), Tullb. 

 [Plate VIIL Figs. 3, 4] 



Common under flower-pots and boards in gardens and 

 greenhouses : occurs also, though much less frequently, 

 under fallen branches, etc., in the open country. Dr E. S. 

 MacDougall has sent us a great many, obtained amongst 

 sawdust at the Edinburgh Botanic Garden. 



On the Continent this small whitish species ranges from 

 Norway to Bohemia; and it is also known from Siberia, 

 Franz Josef Land,^ and Greenland. It appears to be an 

 addition to the British list. 



Local data. — Beneath flower-pots in greenhouses, Morningside, Feb. and 

 April 1899, common ; under pieces of wood on Craigentinny Meadows, near 

 Edinburgh, Feb. ; and on a dead branch lying on the edge of a field, Lawhead 

 Farm, Midcalder, May, a few ; Botanic Garden, Edinburgh, March, swarms 

 amongst sawdust. 



1 A paper on the Collembola collected by the Jackson-Harmsworth 

 Expedition in Franz Josef Land is now in preparation by Carpenter. 



