I NDEX. 



Acridian ears, situation of, 91 

 different forms of, 91, 92 

 forms in which they are absent, 92 

 found in both sexes, and in most 



species, 92 

 function difficult to determine, 92; pos- 

 sible solution of difficulty, 93 

 in Stenobothrus, 92 

 minute structure, 92 

 AcridiidDS, prominent characteristics, S2 

 arranged in nine tribes, 132 

 escape of the young from the egg, of 

 Stmiroiiotus maroccajiiis, 99 ; of 

 Rocky Mountain Locust, 100 

 some species present an unusual aspect, 

 132 

 Acridiides, 107, 108, 126, 133 

 Acrophylla titan, 46, 64 

 Aellopos titan, shot by Bates in mistake 



for a humming-bird, 222 

 Aeronaut, locust is an, 86 

 Affinities in nature, the series of, a con- 

 catenation or continuous series, 187 

 Aggressive Mimicry, 37 



Resemblances, and Protective, 25, 48, 

 52, 60, 67, 132, 136, 139, 153, 154, 

 183 



Air-sacs, in Acridiidre, 85 



absent in other Orthoptera, 86 

 Acridiidce remarkable amongst Orthop- 

 tera for, 85 

 and powers of flight in locust, intimate 



association of, S6 

 arrangement in Rocky Mountain 



Locust, 85 

 found in various insects, 85 

 how dilated, 86 



not found in larva;, nor in truly apter- 

 ous insects, 85 

 use, 86 

 Alluring Colouration, 35 

 Ambulicinas, 222 

 Ameles, prismatic capsules of, 20 

 Amphibious habits, strange, of some 



Tettigides, 134 

 Anabrus, increase to large numbers, 153 

 Anatomy of Acridiidas, 83 

 A ni inula lierrichii, strange larva case 

 of, 209 ; Iiuebneri, its larval case, 

 20S 

 Anisomorpha, defence of, 49, 50 

 Anostostoma, the curious genus, 156 

 Ants as locust enemies, 130 

 Apterous Mantidte and Phasmidte com- 

 pared, 24 

 Apterous Phasmidae, 44, 46, 48, 59, 63 



