124 On Suhaquatic Insects. 



ca Mediterranea and Mackaiana, The former has now been ga- 

 thered in several other parts of Mayo and Galway, and, although 

 the latter is still only known to occur in one spot, yet I am more 

 and more confirmed in the opinion that it is a truly distinct species. 



Upon a wooded hill that projects into Lough Corrib, called Drum- 



sna, I noticed Hymenophyllum Tunbridgense and H. Wilsoni, Ru- 



bus idseus, Hieracium umbellatum, Scolopendrium vulgare, and the 



concave variety of Aspidium dilatatum. Near to Flinn's house 



, there is a great quantity of Osmunda regalis. 



In conclusion, I would point out the two following plants as new 

 to the Irish flora, i. e. Callitriche pedunculata, found in the Mullet, 

 and BIyosotis repens, which is common in Cunnamara, at Westport, 

 and in Erris. 1 carefully examined Cushtrower Bay, but was un- 

 able to find Atriplex pedunculata. 



]My friend, E. Hill Esq. of Oxford, informs me that he gathered 

 Eriophorum pubescens at Woodlawn, near Killconnel, county Galway. 

 This is its second Irish station. He also mentions that Miss Trench 

 has discovered Euphorbia peplis at Garreries Cove, near Tramore, 

 county Waterford. This is not contained in my friend Mackay's Flora 

 Hibernica. Mr Hill was so good as to show me specimens of both 

 these plants. From the accidental loss of a specimen, Fedia auri- 

 cula was omitted by Mr Mackay. I gathered it, as mentioned in 

 Loudon's Magazine, at Oughterard, county Galway, in the month of 

 August 1835. 



St John's College, Cambridge, 

 March 20, 1837. 



Ill — Notes upon Suhaquatic Insects, with the description of a 

 New Genus of British Staphyliriidce, By J. O. Westwood, 

 F. L. S. &c. Plate IV. 



The economy and physiological peculiarities of those species of 

 insects and other annulose animals, which, although organized for 

 aerial respiration, are enabled to abide in situations, which are in- 

 deed their natural habitats, where they are for a very considerable 

 period of time entirely submerged beneath the surface of waters, are 

 extremely interesting, ard well worthy of a more scientific investi- 

 gation than has hitherto been given to them. The habits of the 

 diving water spider ( Argyroneta aquatica. Lair.) have been long ago 

 observed by De Geer and others, but up to the present time, as we 

 learn from Mr Kirby's Bridgewater Treatise, the precise manner by 

 which this spider is enabled to envelope itself in a dome of air, and 



