THE BLACK SILVERHORNS 61 



bank. The flight of the silverhorns is charac- 

 teristic and takes the form of a rapid approach 

 right up to the bank, followed by an equally 

 rapid departure, progress being made up stream 

 or down during the performance of these 

 evolutions. The male genitalia are shown in 

 Fig. 32. 



Another species of Leptocerus occurs very Leptocerus 

 plentifully on the Test, namely, Leptocerus a 

 albifrons, which is chocolate in colour with white 

 markings, and probably also passes under the 

 popular name brown silverhorns. 



Family . . LEPTOCERID^E 

 Genus . . Mystacides 

 Species . . azurea 

 Spurs, 0.2.2. 



PLATE XII 



Mystacides azurea is one of three caddis-flies 

 passing under the name of black silverhorns, 

 the other two being Mystacides nigra and silverhoIQS - 

 Leptocerus aterrimus. 



When at rest, the long hairy palpi are bent 

 round towards each other, and pressed against 

 the sedge on which the insect has settled, giving 

 it somewhat the appearance of being in posses- 

 sion of a fourth pair of legs. The wings are of a 

 deep metallic blue colour, with an apparent 

 incision in the upper and lower edges of the 

 anterior wings, which allows of the extreme 

 ends being somewhat turned inwards. An 



