20 THE SPURS OF THE LEGS 



(The symbol $ is the entomological sign for the 

 male, and $ for the female sex.) 



0.2.2. Mystacides, Setodes, CEcetis, Enoicyla. 



0.2.4. Hydroptila. 



0.3.3. Chaetopteryx, <J . 



0.3.4. Agraylea, Allotrichia, Ithytrichia, Orthotrichia, 



Oxyethira, Micropterna cJ , Mesophylax rf . 

 .2.2. Triaenodes, Erotesis, Adicella, CEcetis. 

 .2.3. Ecclisopteryx. 

 .2.4. Apatania. 



.3.3. Halesus, Chaetopteryx 9 , Drusus. 

 .3.4. Colpotaulius, Grammotaulius, Glyphotaelius, 

 Limnophilus, Anabolia, Phacopteryx, Asyn- 

 archus, Stenophylax, Mesophylax 9 , Micr- 

 opterna 9 . 

 1.4.4. Chimarrha. 



2.2.2. Leptocerus. 



2.2.4. Sericostoma, Notidobia, Beraea, Beraeodes. 



2.3.3. Brachycentrus. 



2.4.4. Neuronia, Phryganea, Agrypnia, Goera, Silo, 



Cruncecia, Lepidostoma, Lasiocephala, Odon- 

 tocerum, Molanna, Hydropsy che, Diplec- 

 trona, Philopotamus, Wormaldia, Tinodes, 

 Lype, Psychomyia, Glossosoma, Agapetus. 

 3.4.4. Plectrocnemia, Polycentropus, Holocentropus, 

 Cyrnus, Ecnomus, Neureclipsis, Rhyacophila. 



Hints may be obtained, when identifying 

 species, from the relative length of the joints of 

 the maxillary palpi, the arrangement of the wing 

 neuration, and I would refer my readers to the 

 figure given on p. n of the neuration of the wings 

 of Hydropsy die guttata. Finally, but most im- 

 portant of all, the student must examine the 

 formation of the genitalia of the male insect 

 with the utmost care, as differences in the 

 structure of these parts give some of the chief 



