Some Spring-tails ncio to the British Fauna. 217 



Family PODURIDiE. 



Achorutes manubrialis, TuUberg. 

 [Plate IV. Figs. 5-9.] 



Achorutes manubrialis, TuUberg, 1872. 

 Achorutes Schotti, Reuter, 1895. 

 Achorutes manubrialis, Scliott, 1902. 

 Achorutes manubrialis, Agren, 1903. 



Nee Achorutes manubrialis, Brook, 1881; Schaffer, 



1896; Carpenter and Evans, 1899. 



In April 1902, Mr A. M. Rodger, of the Perth Museum, 

 forwarded to us a number of Spring-tails which Mr Archd. 

 Gray had that month found in multitudes on the surface of 

 running water in a ditch at Corsiehill, near Perth. 



Examination convinced us that they were identical with 

 the species described by Reuter (1895) as Achorutes Schotti, 

 and our determination was kindly confirmed by Dr Reuter 

 himself. Since then have appeared the papers of Schott 

 (1902) and Agren (1903), who establish the identity of this 

 species with A. manuhrialis, Tullb. The Spring- tail recorded 

 under the latter name by Schott (1893), Reuter (1895), and 

 Schaffer (1896), has been re-named A. Eeuteri by Agren. 



The present species — the true A. manuhrialis of TuUberg 

 — hitherto known only from Sweden and Finland, where it 

 has been found on lake -shores, among grass, etc., may be 

 recognised by the short feeble hairs on the body — only those 

 on the hindermost abdominal segment being strong and 

 bristle-like (Fig. 7), the very short and straight anal spines 

 (Fig. 7), the feet with a single tenent hair, the upper claw 

 with a very feeble tooth, and the lower tapering gradually 

 and evenly to a fine point (Fig. 8), and the simple form of 

 the mucro of the spring (Fig. 9). Our specimens measure 

 from 1 mm. to 1'5 mm. in length. 



Achorutes propinquus, sp. nov. 



Achorutes manubrialis, Brook, 1881 (probably). 

 Achorutes manubrialis, Carpenter and Evans, 1899. 



[Plate IV. Figs. 10-14.] 

 Length, '75 mm. Antennae shorter than the head, 

 the third segment slightly longer than the second or the 



