Gr. H. F. Nuttall 
11 
I. REGENERATION AFTER AMPUTATION OF THE MOUTHPARTS. 
(Experimental Records.) 
1. Argas persicus. 
(a) Operations on the larva and their effect on the first-stage nymph. 
Twenty-two larvae were operated upon after feeding on a fowl. Six 
(Ticks 3, 6, 13, 15, 17, 19) failed to undergo metamorphosis or died soon after 
operation. Twelve larvae were operated upon on 22. ii. 1915 and ten on the 
next day. The following record relates to the sixteen specimens that survived 
and moulted to first-stage nymphs. 
Nature of operation on larva Resultant effect on first-stage nymph 
Argas 
No. 
Palp 
articles 
removed 
Hypostome 
iength 
removed 
Chelicerae 
Palps 
showed stumps 
at article 
Hypostome 
Chelicerae 
d = digit 
1 
R 1-4 
1/3 
R — 
R base 
perfect 
L d perfect 
L 4 
L cut* 
L 1 
2 
R — 
1/4 
R cut 
R 2f 
perfect 
R and L d deformed 
L 2-4 
L cut 
L 1 
4 
R 2-4 
at base 
R — 
R 3 
regen. but 
L d deformed 
L 1-4 
L cut 1 l 
L 3 
deep emarg. 
5 
R 2-4 
2/3 
R — 
R 1 (fig. 4 B) 
perfect 
— 
L 2-4 
L — 
L 1 
7 
R — 
at base 
R — 
R deformed f 
deformed 
— 
L 2-4 
L — 
L 1 
(see fig. 4 G) 
8 
R 2-4 
3/5 
R — 
R 1 
perfect 
— 
L — 
L — 
L 1 
9 
R 2-4 
1/4 
R cut 
R and L 1 
perfect 
R d deformed (fig. 4 K) 
L 2-4 
L cut 
(fig. 4 D) 
L d? 
10 
R 2-4 
at base 
R cut 4 l 
R and L 2 
regen. but 
R d distinctly, and 
L 2-4 
L cut 1 l 
(%. 4 C) 
some asym- 
L d slightly deformed 
metry 
(fig. 4 J) 
11 
R 3-4 
2/5 
R — 
R 2 
perfect 
— 
L 3-4 
L — 
L 2 
12 
R 3-4 
1/4 
R cut 
R and L 3 
perfect 
— 
L 3-4 
L cut 
(fig. 4 E) 
14 
R — 
1/4 
R cut 4 l 
— 
regen. slight 
R d not regen. (see fig. 4 
L — 
L — 
asymmetry 
16 
R — 
2/5 
R cut 1 l 
R deformed but 
regen. slight 
R d deformed 
L — 
L cut 1 l 
of normal length f emarg. 
L d deformed 
18 
R 2-4 
at base 
R cut 1 l 
R 1 
perfect 
R d deformed 
L 2-4 
L cut 1 l 
L l 
R d distinctly deformed 
20 
R — 
near base 
R cut d 
— 
perfect 
R d deformed 
L — 
L cut 1 l 
L d deformed, useless 
21 
R — 
2/5 
R cut 1 l 
regen. slight 
R d slightly deformed 
L — 
L cut 1 l 
asymmetry 
(fig. 3 A) 
L d „ „ 
22 
R 2-4 
2/5 
R cut 
R 1 
do. 
R d useless (fig. 4 L) 
L crushed? 
L cut 
L 2f 
L d slightly deformed 
* Owing to loss of some amputated parts of chelicerae it is impossible in all cases to specify 
how much was removed. 
f The tick must have been unwittingly injured at operation. 
