THE ACARI. 
Bd. V: 1 1) 
13 
pairs on the inner side of coxæ III and one pair on the inner side of coxae IY 
behind their middle. 
Near the anterior margin, behind the first pair of hairs, is to be seen a pair of 
long, transversal, light-coloured grooves. This feature, in connection with the super- 
numerary number of sternal hairs, seems to indicate that the portion in front of 
the grooves is homologuous to the second pair of jugular shields, which is to be 
found in the other species of Hydrogamasus. Thus in the present species, if my 
interpretation be correct, the posterior pair of jugular shields has coalesced with 
the sternal shield. 
The sternal shield extends backward as far as the hind margin of coxæ IV, 
gradually narrowing backwards; hind margin slightly convexe. The genital aperture 
inserted in an incision of the front margin of the sternal shield. 
Ventri-anal shield large, covering nearly the whole belly, shaped like that of 
H. salinus Lab. Anal aperture situated close to the posterior margin. 
Legs. Legs I long and slender, with long coxæ bent like a knee; claws and 
caruncles smaller than those of the other legs. Legs II (PI. II, fig. 6) thick, with 
great calcar femoralis curved sharply upwards, of uniform width throughout and 
ending in a sharp, chiselshaped square edge; no processus axillaris, only a short hair 
in its place; processus stridularis genitalis a rather low ridge with rounded edge; 
processus tibialis perpendicular, short, thorn-shaped. The tarsus has a very remark- 
able shape and bears a great resemblance to that of Gamasellus Racovitzai; it is a 
little in front of the joint between basi-and telotarsus, curved downwards and on the 
Hydrogamasus antarcticus Tgdh. 
Fig. 18. Palp, cf • 1 12 x. Fig. 19. Epistoma, <g. 464 x. Fig. 20. Ambulacre II. 464 x. Fig. 21. Am- 
bulacre I. 464 x . Fig. 22. Jugular-, genital- and anterior part of sternal shield, <y. 232 x . Fig. 23. Anterior 
part of hypostoma, cT- 464 x . Fig. 24. Basitarsus and part of telotaTSus with processus tarsalis cL 
Dorsal view 464 x . Fig. 25. The same cT side view. 464 x . 
