178 
Notes on Ticks 
occur only near the posterior border of the body and extend along the 
sides to near the spiracles. Spiracles medium, rounded. Gapitulum 
0‘3 mm, longh very small compared to the body; base with rounded 
sides, narrowing behind ; dorsal ridge narrow, straight, not attaining the 
sides and continuous from the external angles with slight lateral ridges 
which converge anteriorly; base convex ventrally, no ventral ridge; no 
auriculae. Palps short, slightly excavate, converging and blunt distally 
(asymmetric in the type), considerably longer than the hypostome, with 
article 1 distinct dorsally, articles 2 and 3 fused, article 4 appearing as 
a relatively large chitinized plaque. Hypostome short, glossy, unarmed, 
Fig. 1. Ixodes caledonicus Nuttall, 1910; 3 dorsum and venter; (H) tip of 
hypostome, highly magnified; spiracle and tarsus 4. 
with median longitudinal ridge, bluntly rounded in front with a small 
median prominence. Legs: all the coxae bear two stout postero-external 
spurs, the one dorsal^ to the other and decreasing in size backward; 
coxae I-III with short postero-internal trenchant spur decreasing in 
^ Measured from the dorsal ridge to the tip of the hypostome. 
2 The presence of the prominent dorsal postero-external coxal^pur in the male led me 
to re-examine the $ , o and l, to see if I had overlooked this peculiar structure in them. 
I find that the i shows these spurs but that they are less developed than in the 3. In 
the female they are present on coxae I-III, very slight on coxa III, and absent on coxa 
IV. In the nymph they are present on coxa I, slight on coxa II, absent on coxae III-IV. 
In the larva they are absent. Although these spurs are easily overlooked it is well to 
note them in connection with the description I have already published of the ? , o and l 
of caledonicus. 
