A. C. OUDEMANS, NOTES ON ACARI. 31 



finely wrinkled in the unprotected parts. Dorsal side 

 (fig. 10) protected by two shields. Anterior shield 

 well shouldered about in the middle of its length, sinuated 

 inward before and behind the shoulders; posteriorly sinuated 

 outward on the sides and in the middle. Posterior shield 

 almost semicircular; anteriorly sinuated inward in the middle. 

 The shields are separated and surrounded by an unprotected 

 band. The portion between the shields and behind the posterior 

 one may become enormous in extraordinary swollen specimens. 

 Hairs. The following hairs are rodlike and distally hairy 

 (fig. 12): on the anterior shield a pair of vertical hairs, 

 a pair of shoulder hairs, a pair of hairs between and a little 

 before the shoulder-hairs, and a pair of hairs in the posterior 

 half of the shield ; on the posterior shield a pair exactly on 

 the posterior margin. All the other hairs are minute bristles: 

 about I'l pairs on the anterior shield and about 14 pairs on 

 the posterior shield; the foremost pair in the median streak 

 of the posterior shield is a little larger than the others and 

 corresponds with the same pair in the protonympha (fig. 1); 

 this may be said also of the hindmost pair (compare fig. 10 

 with fig. 1). Many minute bristles in concentric rows behind 

 the posterior shield. 



Ventral side. T r i t o s t e r n u m (fig. 13) with rather 

 long main trunk and very long flagellae (twice as long as base). 

 Halfway the main trunk is provided with the usual lateral 

 triangular transparent pieces; distally ditto; the flagellae are 

 mere prolongations of the main trunk; there is no demarca- 

 tion between them and the latter. Jugular shields 

 (fig. 11) minute, triangular. Stern o - m e t a s t e r u a 1 

 shield of the same configuration as the sternal shield in 

 the protonympha (fig. 2), but of course with 4 pairs of hairs. 

 Inguinal shields minute, round. Anal shield of 

 usual size, almost round, with the usual three hairs and the 

 cribrum. Postanal hair minute. P e r i t r e m a t a 1 shields 



