38 



I Fclmiiiry, 



NOTES ON THE METAMOEPHOSES OF TWO SPECIES OF THE 

 GENUS TINODES. 



BT KENNETH J. MORTON. 



During the past season I liave had tlie opportunity 

 of studying the preparatory states of Tinodes iccsneri, 

 L., and T. aureola, Zett., and have found them to 

 possess many peculiarities of habit and of structure. 

 As far as I know, little or nothing has been written 

 on the habits of the larvae and nymphs of the Euro- 

 pean species of the genus, with the exception of Pictet's 

 short notice {Hy dropsy che macuUconiis, Eecherches, p. 

 213, pi. xviii, fig. 2), and no details of structure appear 

 to have been published. The following account may, 

 therefore, be of service. 



The localities frequented by T. ivceneri and T. 

 aureola respectively differ considerably from one another 

 in character, the first-named insect preferring lakes, 

 rivers, and streams of more or less importance ; whereas, 

 on the other hand, the second haunts springs and little 

 streams, especially where these run down nearly perpendicular rocks. 

 Sometimes, it is true, Tinodes aureola swarms along rivers with rocky 

 banks, but I think it will always be found in such cases to be attached 

 not to the rivers themselves, but to the dripping rocks on the sides. 



