Bd V: ii). 
THE AC ARI. 
9 
obliquely and backwardly directed projection, nearly cylindrical in form, which seems 
to be the orifice of a duct. The projection is supported by a strong sharply pointed 
bristle, situated close to the anterior margin of the basitarsus. Furthermore there 
are two sharp ridges on the internal side of the telotarsus extending one in front 
of the other along a line drawn from the top of the projection obliquely towards a 
large hair, situated near the ventral (inner) edge of the telotarsus. 
Legs III and IV slender, with tarsi narrowing gradually towards the end; 
tarsi IV longer and provided with longer hairs. 
Female. 
The epistoma and hypostoma are correctly delineated by TROUESSART with the 
exception, that there are four pairs of hypostomatic hairs instead of the two pairs 
delineated by him. The second free joint of the palpi thick, but without a distinct 
ventral projection. 
The mandibles (PI. II, fig. io); the lower jaw slightly shorter than the upper 
one, for the two distal thirds of its length curved upwards, with large terminal tooth 
and three others of which the posterior one is the largest. The upper jaw is straight 
and has, besides the terminal tooth, five others of which two small ones are situated 
opposite the terminal tooth of the lower jaw and the 3rd and 4th opposite the first 
and second of the lower jaw. 
The legs (Text-figs 11 & 12). The exterior dorsal edge of trochanter IV bears 
two straight projections of which the anterior one is twice as long as the posterior 
one. The telofemur, on the ventral side, close to the proximal edge provided with 
a third projection directed obliquely outward. TROUESSART has not delineated the 
smaller one of the processi trochanteralis, which is indeed easily overlooked if the 
leg be not cut off and examined from both sides. The cuticle of trochanter IV has 
distally a rounded elongate area, striated transversally (Text-fig. 12). 
The above described species differs from the other members of the genus 
through the peculiar shape of tarsus II of the male. As however a structure of 
tarsus II cP very similar to that of G. Racovitzai occurs in a member of quite 
another genus viz. Hydrogamasus which will be described below it appears to be of 
no generic nor even of subgeneric value. 
A processus tarsalis of c? leg II has, as far as I am aware, as yet only been 
found in Parasitas magnus Kr. and in Halolælaps glabrhisculus Berl. & TROUES- 
SART. In both these species they are however differently shaped and situated on 
the ventral side of the tarsus, not on the dorsal side as in G. Racovitzai and 
Hydrogamasus antarcticus Processi trochanteralis and femoralis of leg IV $ have 
only been found in the female of Cyrtolcelaps Capreolits BERLESE from Java. 
Locality : No. 2. Several males, females and nymphse. 
i03 %7 Schwedische Südpolar- Expedition içoi — içoj. 
2 
