INDEX. 



2 53 



Psychidse, females are perpetual prisoners 

 within larva habitaculum, 206, 216, 

 218 



larvse subject to attacks of parasites, 

 215 



probable cause of disappearance of 

 beauty in male, 214 



singular rarity of moths considering 

 abundance of cases, 214, 215 



strangely difficult to rear, 215 



want of homogeneousness in perfect 



state of insects of this group, 213 

 Pterochroza, the genus, wonderful pro- 

 tective resemblance of, 154 

 Ptilota of Aristotle, the, 203 



R 



Rachitic condition of locusts, cause of, 



130, 131 

 Reaumur, the earliest writer on sound 



made by Death's Head Moth, 233 

 Rearing Death's Head Moth, difficulty 



of, 232, 242 

 Riley, on hatching of Rocky Mountain 



Locust, 100 



on music of Locustidse, 148, 149 

 on music of Microcentrum retinerve, 

 149 ; on its interesting habits, 150 f 

 Rocky Mountain Locust, arrangement of 



air-sacs in, 85 

 appearance, 108 

 extent of period of oviposition, 96 ; 



number of egg-masses, 96 

 migratory habit, 108 

 process of hatching, 100 



Sack-bearers, young, at home, 206 

 ingenuity in construction of cases, 206, 

 208, 209 



Sacktragers, 204 



Sagides, some members of, 155 



Saltatoria, term " grasshopper " applied 



to two families of, 82 

 Saussure, de, on slender stick-like forms 



in the genus Peringueyella, 155 

 on oceans being impassable to locusts, 



126 



on Oedipodides, 126 

 on the geographical distribution of 



Pamphagides, 136 



Savigny, on the genus Eremiaphila, 28 

 Schistocerca americana, 107 

 peregrina, perhaps originally native to 



America, 126 

 distribution, 107 

 may deposit eggs at more than one 



spot during migration, 96 

 occasionally penetrates to our shores, 



108; crossing the ocean, 108, 126 

 post-embryonic development, 101 

 Schizodactylus monstrosus, 158 

 Scorpions, as locust-enemies, 129 

 Scudder, on the song of Katydids, 150 

 on the music of the Stenobothri, 90 

 on the Protophasmidae, 79 

 Sea, Death's Head Moth at, 238, 239, 241 

 Seas, that locusts traverse, of consider- 

 able width, 108, 125, 126 

 Sense-organs, in Acridiidse, 83, 84, 91 ; 

 sense of sight, of sound, of touch, 

 and taste, 84, 92 

 in Locustidse, 141, 145 

 Sloane's, Sir Hans, history, on locusts 



crossing the ocean, 126 

 Smerinthinse, 224, 225, 227, 228 

 Song, gift of, Acridiidse remarkable for, 88 

 apparatus for producing sound, 88, 89 

 in aberrant forms of Acridiidse, 88, 135, 



137 



music characteristic of male, 90 

 of importance to Acridiidse, 88 

 Sound emitted by Death's Head Moth, 



233> 236 



