XXI INSECT A: NEUROPTERA 325 



surface, where the pupal skin is cast and used as a support 

 by the caddis until it can fly away. 



Classification of the Neuroptera mentioned in Chapters 

 XX. and XXI. 



Order. Neuroptera. 



Family 1. OJontata (Dragon-files). 

 Sub-family 1. Libellulidae. 



Genera. Libellala. Sympetrum. Orthetrum. 

 Sub-family 2. Aeschnidae. 



Genera. Aeschna. Anax. Cordulegaster. 

 Sub-family 3. Agrionidae. 



Genera. Agrion. Lestes. Pyrrhosoma. 

 Sub-family 4. Galopteryginae. 



Genus. Calopteryx. 

 Family 2. Ephemeridae (the May-flies). 

 Genus. Ephemera. 

 Family 3. Perlidae (the Stone-flies). 



Genera. Perla (the Stone-fly). Ghloroperla 

 (the " Yellow Sally "). Nemoura (the 

 Willow-fly). 

 Family 4. Sialidae (Alder-flies or Humpbacks). 



Genus. Sialis. 

 Family 5. Chrysopides (Lacewing-flies). 



Genus. Chrysopa. 

 Family 6. Phryganeidae ( = Triohopteiu) (Caddis-flies). 



Genera. Phrygavea. Triaenodes. Limno- 

 philus. Anaholia. Stenophylax. Hydro- 

 psyche. Pledrocnemia. Molanna. 



Practical Notes on Chapter XXI. 



1. Those Neuroptera with aquatic larvae, such as May-flies, 

 Stone-flies, and Alder-flies, may be found in many ponds and 

 rivers, but they are not at all easy to keep alive in an aquarium. 

 If the attempt is made, the tank should be filled with pond water, 

 and at the bottom there should be a fairly thick bed of earth with 

 plenty of vegetation ; if possible, artificial aeration should he 

 supplied. 



May-fly larvae are plentiful in most ponds and rivers ; Stone- 

 fly larvae are to be looked for under the stones in clear streams 

 in the early summer. Alder-fly eggs are very frequently to be 

 found on the plants growing along the bank of a river, and a little 



