240 A. C. OUDEMANS, NOTES ON ACARI. 
Mandibles short, reaching, when wholly retracted, the 
fourth median pair of dorsal hairs (fig. 1 dotted line). Chelae 
(fig. 11) robust; tibial sense hair a little before the joint of 
the lower jaw; tarsal sense hair on the usual place. Upper 
jaw crooked, with three small incisors, and five large trian- 
gular canine-teeth of equal size; the last two of these canine- 
teeth touch with their tops, like we may do with our thumb 
and fore-finger. Lower jaw crooked, with one large incisor 
and three large canine-teeth crooked backward ; here there is 
also an indication of a molar. Pulvillum: a rowof hairs. 
Maxillae (fig. 12, 13). Underside of capitulum with 
the usual 4 pairs of strong bristles. Bristle I rather far from 
the horns, normal; bristle II on the usual place, small; 
bristle III on the usual place, long; bristle IV rather far 
inward, pectinate outward. There are about 10 median trans- 
verse rows of minute triangular dents; the three foremost 
rows straight; the remaining concave forward; the third, 
counted from behind forward, again curved backward. Of the 
free portion, the so called hypostome, the outer malaeor 
horns normal, somewhat crooked outward, and. pointed ; the 
inner malae again divided in an outer transparent blade and 
an inner long outerly franged slip; the inner malae slightly 
vary; in fig. 12, the outer blades are long, and in fig. 13 
they are short and wide and provided with a proximal inner 
tooth. Also the frange varies a little. These variations 
are local ones and therefore may be of great 
systematic value when we consider these 
variations as spring-variations or mutations. 
Palps dorsally (fig. 1): the femur, somewhat swollen, bears 
the usual middle hair and the usual distal and inner trans- 
parent pin, both curved inward and forward. Ventrally (fig. 14) 
the trochanter with the usual two hairs, both inward of the 
median plan of the trochanter, the proximal one directed 
outward and distally pectinate outward ; the distal one directed 
