XVI S YAW PS IS. 



pillar-like form of larva, 177. Boreus, 177. Remnants of wings 

 in male, no wings in female, 177. General remarks on Mecoptera, 

 177. Classification of Mecoptera, 177. Absence of Thysanuri- 

 form larva in this and succeeding orders, 177. Theoretical 

 considerations, 177. 



ORDER XIII. — TRICHOPTERA. 



Living caddis-worms in the school-room, 178. Resemblance 

 of caddis-fly to generalized Lepidoptera, 178. Reduced size of 

 sucking mouth parts, 179; Hagen's view on the food of Phry- 

 ganeidae, 179. vStructure of wings, significance of term "Tri- 

 choptera," 179. Caterpillar-like form of larval Anabolia, 179. 

 Habit of making an artificial covering, 180. Exception to general 

 statement in regard to eyes and antennae, 180. Mastication and, 

 in part, locomotion performed by mandibles, 180. Respiratory 

 abdominal organs, 180. Structural changes in pupal stage, 181. 

 Native caddis-fly larvae in streams near Boston, 181. General 

 remarks on Trichoptera, 182, Order of relations found in 

 Mecoptera reversed in Trichoptera, 182. Disappearance of 

 abdominal legs through disuse, 182, 183. Resemblance of adult 

 caddis-flies to Microlepidoptera, 183. Probability that the 

 Trichoptera and Lepidoptera had a common origin, 184. 



ORDER XIV. — LEPIDOPTERA. 



Phenomenon of indirect metamorphosis best illustrated in the 

 school-room by the Lepidoptera, 185. Natural order of lessons, 

 185. Directions for collecting and preserving butterflies, 186. 

 Preparations of specimens for class-work, 186. Structural feat- 

 ures of milkweed butterfly, head, small size of prothorax, 186; 

 mesothorax with shoulder lappets, 187. Freedom of motion of 

 wing-bearing segments, 187. Butterfly apparently an excep- 

 tion to law that power of flight is correlated with tendency to 

 consolidation of thoracic region, 187; explanation found in 

 wave-like flight of butterfly and structure of hind-wings, 187; 

 light thrown on the subject by the structure and rapid flight of 

 the hawk-moth, 188. Burgess on the thorax oi Danais Archip- 

 pus, 188. Structure of abdomen, probable scent-organ, 188. 



