Ed. V: ii) 
THE ACARI. 
3 
the sides and a small triangular space at the front. The anterior shield is the 
largest, subtriangular with convex sides; the greatest width is near the postero-lateral 
angles; at the front well rounded; the square hind edge covers the front margin of 
the posterior shield. The posterior shield is subquadrangular with slightly convex 
sides and rounded angles; the hind margin is contiguous with the hind margin of 
the body; the greatest width is at the antero-lateral angles. 
Both shields are coarsely reticulated by irregular, raised ridges, which leave 
shallow, depressed spaces between them; even in these spaces there are granulations. 
The ridges and the depressed spaces are differently shaped in the two shields. On 
the anterior shield the depressed spaces are, especially in the central part of it, more 
or less rounded and the ridges are broad and smooth; the markings are arranged 
symmetrically to the sagittal axis. 
On the posterior shield the ridges are narrow and arranged concentrically round 
a point situated in the middle, near the front margin; the spaces between the ridges 
are polygonal and the ridges show a strongly undulated outline. 
On the unprotected parts of the dorsal side there are also irregular ridges 
which are generally arranged more or less parallel to the sides. The cuticle is in 
these parts finely concentrically striated. 
The hairs (PI. I, fig. 2) are thick, clavate, slightly curved with 4 — 5 longitudinal 
ridges. 5 pairs are much larger than the others; they are arranged as follows: one 
pair, the largest, is flat and pointed at the tip, directed forward and situated at the 
anterior end of the body, on a pair of tubercles; one pair at the anterior end of 
the anterior shield, two pairs at the sides of the anterior shield in its posterior half, 
and one pair at the hind margin of the posterior shield. The situation of the other 
hairs is shown in PL I, fig. 8. 
Ventral side. Tritosternum. Of this I have not been able to see distinctly 
the shape; the trunk seems to be 3 times as long as it is broad and almost 
cylindrical. 
No jugular shield. 
Sternal shield is narrow and not reticulated, but finely punctured, weak, and 
fused with the ventri-anal shield; 4 pairs of hairs, one near the anterior margin, one 
on the inner side of coxae II and two on the inner side of coxae III. 
Genital aperture large, inserted in an incision of the anterior margin of the 
sternal shield. 
Ventri-anal shield very large round, covering the whole belly behind coxæ IV 
except for a narrow band along the lateral margin, reticulated like the posterior 
dorsal shield; 4 pairs of fine hairs of ordinary shape on the ventral portion and 4 
pairs of rather large, clavate hairs on the anal portion. 
Anal aperture situated near the hind margin of the shield. 
