130 (dr. a. c. oudemans). notes on acari. 



posteriorly). On the posterior shield 4 pair of feather-like hairs 

 (one on the anterior, and 3 on the lateral margin). On each of the 

 minute lateral shields 1 feather-like hair. So there ai"e 10 pair of 

 feather-like hairs on the dorsum. On the posterior dorsal shield, 

 quite posteriorly, the minute genital aperture is flanked by 3 pair 

 of minute crooked pins. The penis, which is visible by the trans- 

 parency of the shield, projects its top through the genital aperture. 



Fig. -49 represents a feather-like hair of the dorsum under high 

 amplifications. 



Before the body we observe the capitulum, which is very wide 

 by the enormous development of the maxillar palps. A square, 

 horizontal, median portion of it is distinct fiom the lateral sloping 

 parts. If we follow the two lines of demarcation between these 

 three parts forward, we meet with two short claw-like prominences. 



In front of the median horizontal part we observe a circle of 

 tubercles resembling a crown. If we bring the posterior (most 

 dorsal) part of the crown in the focus of the microscope with a 

 high amplification, we do not observe the stigmata^ nor the lower 

 part of the crown. If we lower the microscope, we observe fust 

 the stigmata, and finally the lower part of the crown. We may 

 safely conclude therefore, that the stigmata are situated at the 

 bottom of a cup with a crownlike margin. Behind the crown the 

 peril remata are visible, of the usual type. Before the crown the 

 rostrum is provided with many lower tubercles, two lateral square 

 apophyses, and a median flat portion, flankled by two bristles. 

 The utmost tip of the rostrum itself is flanked by two extiemely 

 minute organs (tactile ?). — 



Ventral slie (fig. 48). The ventral side is finely winkled, except 

 the sternal shield, the parts occupied by the coxae of the legs 

 (the so-called epimera), the underside of the head, and the anal 

 covers. In the space between the 8 coxae 2 pair of little hairs; 

 behind the coxae 4 pair of little hairs. The anal covers project 

 a little beyond the hind-margin of the abdomen. Between coxae 

 3 and 4, quite laterally a featherlike hair. 



Maxillar paljps. Dorsal side (Fig. 47). Second (fiist free) joint 



