66 CH1MARRHA MARG1NATA 



Family . . PHILOPOTAMID^E 

 Genus . . Chimanha 

 Species . . marginata 

 Spurs, 1.4.4. 



PLATE XIII 



Chimarrha marginata is a pretty little sedge, 

 with a colouring of dark brown and bright 

 yellow. It is plentiful on the Test, particularly 

 so where the stream runs at a fast pace over 

 mossy boulders. So brightly coloured is this 

 insect that it might well be mistaken for a 

 moth (a caddis-fly being usually more subdued 

 in appearance), did not the magnifying glass 

 reveal the presence of hairs on the wings in 

 lieu of the scales of a lepidopteron. 



Family . . RHYACOPHILIOE 

 Genus . . Rhyacophila 

 Species . . dorsalis 

 Spurs, 3.4.4. 



PLATE XIII 



Rhyacophaa Rhyacophila dorsalis is one of the commonest 

 ^ of the British caddis-flies, being found on almost 

 every river from April right through spring, 

 summer, and autumn. Occasionally males are 

 found wiih green bodies, but this seems to be 

 a mere " sport." It is noteworthy that the 

 larvae of the Rhyacophilidce make themselves 



