RICE-PEST OF BRITISH BURMA. 7 



in which they have been curled, twisted, and entangled 

 by the combined action of spirit and of pressure, to deter- 

 mine their precise direction, but, of the two series of 

 tergal tufts, the upper appears to have been directed 

 almost straight upwards, and the lower to have had a slight 

 inclination outwards, whilst the sternal series projected 

 more or less directly downwards, in the living caterpillar 

 Besides the arrangement in longitudinal rows and series 

 already described, the tufts have a definite arrangement 

 on the several somites of which the insect's body is 

 made up : if we examine an abdominal somite, say the 

 third, carefully, we shall find that there are present two 

 tufts belonging to the supraspiracular series, and two 

 belonging to the lower or infraspiracular series of tergal 

 tufts, and that in each series one of the 1wo tufts lies in 

 front of the other ; in other words, that there are an anterior 

 and a posterior supraspiracular, and an anterior and a 

 posterior infraspiracular tuft, and, further, that there are 

 two sternal tufts, one at each end, on each side, or 12 

 tufts to the somite; consequently, if each of the 12 

 somites of the body were provided with its full comple- 

 ment of tufts, there would be 12X12=144 tufts in all. 

 But owing to the suppression of some or all of the tufts on 

 certain somites at both ends of the body — for instance, 

 the first somite has no tufts at all, the second and third 

 want the anterior sternal and the anterior tergal of the 

 infraspiracular series, and the last the anterior pleural 

 and all its tergal tufts — the actual number falls much 

 below this. 



The following table showing the distribution of the 

 tracheal-gill tufts over one side of the body will, it is 

 hoped, render the foregoing description somewhat more 

 intelligible : — 



