17^ The Irish Natuialist, vSeptember, 



spring is somewhat short, the proportional length of manu- 

 brium and dentes being as 8 : 9. At the extremity of the 

 manubrium are a number of chibbed, curving bristles. The 

 mucro has only two teeth, the forward of which is strengthened 

 by a di.stinct posterior ridge (fig. A, 4) The combined 

 characters of the feet and spring render this insect markedl}^ 

 distinct from any known BritivSh or Irish species. 



There can be little doubt that /. icnclla awaits discovery 

 elsewhere in Ireland than at its present single I,einster 

 locality (Kilkenny), and it will ver}^ likely be found also in 

 Great Britain as well. The species was described by Reuter 

 ('95) from .specimens taken in Finland, and it has since 

 been recorded from Weiburg, in German}', by Borner ('or, 



P- I35-) 



Agrenia bidenticulata (Tullb.) var. nov. ei,ongata. 



I had the pleasure of finding the first Irish examples of this 

 species in County Waterford in June, 1906, on the occasion of 

 the annual " long excursion " for natural science .study with 

 students from the Royal College of Science. We were on the 

 road from Dungarvan to Carrick-on-Suir, which skirts the 

 Comeragh Mountains, and we halted for a while at the stream 

 that comes down from Lough Coom.shinghaun. Colonies of 

 the springtail were found lurking beneath parti}' submerged 

 stones in the stream. In March of the next year (1907) further 

 .specimens were obtained, under similar auspices, in the Glen 

 River above Newcastle, County Down. And in September, 

 11,07, when visiting Powerscourt, County Wicklow, with the 

 Dublin Naturalists' Field Club, a few specimens were found 

 in the Upper Dargle above the Waterfall. The species thus 

 inhabits three at lea.st of our Irish provinces — Munster, Ulster 

 and Leinster. 



This species was described by Tullberg ('76) as Isotoma 

 hidenticulaia^ but it differs so markedly from typical Isotomse 

 that Borner ('06) has lately proposed the genus Agrenia for its 

 reception. The dentes of the spring are closely covered with 

 rounded tubercles (fig. B, 4), and on the inner face of each 

 dens is a long, conspicuous, pointed bristle which extends 

 beyond the tip of the mucro ; the claw of the foot has a small 

 but distinct tunica (fig. B, 3, /), and the empodial appendage 



