Bd. V: ii) 
THE ACARI. 
1 1 
Fig. 15. Right maxillary lobe. 232 x. Fig. 16. Epistoma. 464 x. Fig. 17. Jugular, genital and anterior 
part of sternal shield. 330 x . 
Parallel with the anterior edge of the sternal shield, behind the anterior pair of 
hairs there is a pair of light coloured grooves, which, as in the case of Hvdroga- 
■masus antarcticus Tgdh I interpret as being remnants of a fusion between a 
second pair of jugular shields and the sternal shield. This seems all the more 
probable as in G. pulchellus there are two pairs of jugular shields. Such light 
coloured grooves are also to be found running parallel with the edges of the foveolæ 
pedales. (Text-fig. 17.) Five pairs of hairs on the sternal shield, of which one pair 
is near to the anterior margin, one on the inner side of coxae II, two pairs on the 
inner side of coxae III and one pair in the postero-lateral angles. 
The genital aperture large, covered by a rounded plate, whose anterior edge projects 
in a small point: the genital plate is almost entirely surrounded by the sternal shield. 
(Text-fig. 17.) The ventri-anal shield coalesces whith the dorsal shield in the posterior 
half, but a distinctly demarcated line runs in an even curve inwards from the postero- 
lateral angles of the peritremata and extends backwards as far as r /z of the length 
of the ventri-anal shield. 
There are about 14 pairs of hairs shaped like those of the dorsal shield. 
Anal aperture small, raised and situated near the posterior margin. 
Stigmata between coxæ III and IV ; peritremata lateral, raised, extend forward 
to the level of the anterior margin of coxæ I; peritrematic shields discernible on the 
exterior side near the posterior end of the peritremata, not demarcated from the 
ventri-anal shield at the back. 
The legs richly provided with rather long, fine, bare hairs. Legs I with long, 
curved coxæ, twice as long as the trochanter, which on the dorsal side has a large 
bristle; femur of the same length as the tarsus, which latter is of even width through- 
out and narrows very abruptly at the end; genu nearly of equal length with the tibia, 
which is 4 / 5 of the tarsus; tarsus very richly provided with hairs, especially at the 
end, on the exterior side; claws small with semicircular caruncle. 
Legs II, large and thick; femur with calcar femoralis (PI. I, fig. 7) rather long, 
fingershaped, with constricted base and rounded tip; there is no processus genualis 
