Seance dit / D'-rrinbrc 1'J2I 127 



bands, llic ïroiil one darker and the hind one paler, 

 separated lj> a lij;hl-(olouivd line. These paired 

 joints seem to arise from a secondary division, 1 am 

 therefore inclined to think Ihat the increase in the 

 number of joints lakes place in Iwo N\a\s ijt l'^iììpusa, 

 J " at the expense of the 3rd joint as a series of rings 

 arising- from the tip; 2" by a secondary division into 

 lyvo of some at least of the new joints (5). 



We must therefore conclude that ; 



1" Of the 18 joints which already exist at the 

 iime of hatching, 2 remain in the basal portion and 

 1 5 in the apical without any subdivision until the 

 last stage (6); 



2° the new joints, which in the male are soon 

 transformed into lamellae or llallened rings, first 

 arise from the 3rd joinl by primary proliferation oî 

 that joint, but thai some of these new joints sub- 

 sequently undergo a secondary division which dou- 

 bles their number. 



The antenna of the adult female differs from that 

 of the male : i" bv the absence of leeth or lamellae; 



(5) A few prepa)'a1ii)us, some ol' the i^reut Kuipii'^a of 

 Ceylon, GoiigylKs (jonyi/loidcs^ and tlie otlier.s of the 

 common INIautis, .\[(iiilis / v/;;y.,,.sv/, liavc shown nie also 

 between the haS(- and tlic insidie of the antenna olivious 

 signs of division, so tliot I am inclined to tliink that this 

 second mode of growth nmst he taken into considei'ation 

 for Orthoptera. in general. 



(6) The fact that tlie two basal joints undergo no 

 change, except growth from the time of hatching to the 

 imago stage, may be duo to the fact that in all Orthoptera 

 the antennal muscles are inserted on tiio inside of these 

 joints. 



