224 THE CANADIAN ENTOMOLOGIST 



Explanation of Plates VI and VII. 

 PLATE vi. 



Fig. 1. Macronema zebratum Hag.; a, branched tracheal gills; 

 b, prolegs; c, rectal gills. 



Fig. 2. Phryganea sp.; a, tubercles; b, tracheal gills; c, lateral 

 line; d, prolegs. 



Fig. 3. Macronema zebratum Hag.; ventral aspect of prolegs; 



a, 8th abdominal segment; b, 9th abdominal segment; c, basal 

 segment of prolegs; d, claw of proleg. 



Fig. 4. Platycentropus hostis Hag.; dorsal aspect of prolegs; 



b, 9th abdominal segment; c, basal segments of prolegs forming 

 a 10th abdominal segment; d, claws of prolegs; e, supporting plate 

 of claw. 



Fig. 5. Rhyacophila fuscida Walk.; labium and maxilla; 

 a, labial lobe; b, labial palpus; c, maxillary lobe; d. maxillary 

 palpus. 



Fig. 6. Mystrophora americana Banks; labium and maxilla; 

 a, labial lobe; b, labial palpus; c, maxillary lobe; d, maxillary 

 palpus. 



Fig. 7. Rhyacophila fuscida Walk.; lateral view of prolegs; 

 a, 8th abdominal segment; b, 9th abdominal segment; c, claw of 

 proleg; d, accessory claw; e, basal segment of proleg; f, dorsal 

 plate on 9th abdominal segment. 



Fig. 8. Mystrophora, americana Banks; a, 8th abdominal seg- 

 ment; b, 9th abdominal segment; c, claw of proleg; d, basal seg- 

 ment of proleg; e, dorsal plate on 9th abdominal segment. 



Fig. 9. Chimarrha sp.; dorsal view of clypeus and labrum; 



a, clypeus; b, labrum; c, connecting membrane; d, anterior angles 

 of labrum. 



Fig. 10. Macronema zebratum Hag.; dorsal view of head; a, 

 true clypeus; b, false clypeus; c, carina; d, labrum; e, connecting 

 membrane; f, mandibles. 



Fig. 11. Hydropsyche sp. dorsal view of head; a, true clypeus; 



b, labrum. 



Fig. 12. Macronema zebratum Hag.; branched tracheal gill. 



Fig. 13. Macronema zebratum Hag.; ventral aspect of left 

 mandible. 



Fig. 14. Psychomyia pusUla F'abr; claw of 1st leg (after Ulmer). 



