G . H. F. Nutt all 
21 
When the basis capituli was cut across in second-stage nymphs, as was 
done successfully in two instances, almost perfect regeneration followed in 
one case (Argas 72), whilst in the other, where the basis was cut across half¬ 
way,* the palps only reappeared as short stumps, the hypostome was absent 
and the digits deformed. 
The results obtained with Argas , in respect to the power possessed by 
various immature stages of regenerating their mouthparts, are best elucidated 
by the following summary relating to the milder operations described in the 
foregoing pages: 
OPERATIONS ON LARVAE 
Palps amputated 
Hypostomes amputated 
RESULT IN NEXT STAGE 
21 2 regenerated partly 
19 not regenerated 
10 10 regenerated 
9 perfect 
5 slightly deformed 
2 deformed 
Digits amputated 18 17 regenerated 
5 slightly deformed 
8 deformed 
4 much deformed 
1 not regenerated 
OPERATIONS ON FIRST-STAGE NYMPHS 
Palps amputated 
13 
11 regenerated 
2 perfect 
5 short or imperfect 
4 partially regenerated ' 
2 not regenerated 
Hypostomes amputated 20 20 regenerated 
15 perfect 
5 slightly deformed 
Digits amputated 17 17 regenerated 
5 perfect 
0 slightly deformed 
0 deformed or small 
OPERATIONS ON SECOND-STAGE NYMPHS 
Palps amputated 15 15 regenerated 
15 perfect 
Hypostomes amputated 8 8 regenerated 
5 perfect 
2 slightly deformed 
1 badly deformed 
Digits amputated 11 11 regenerated 
9 perfect 
2 slightly deformed 
It should be noted, at the outset, that operations on larvae which have 
dropped off in a replete state from the host yield, on the whole, unfavourable 
