242 A. C. OUDEMANS, NOTES ON ACARI. 
in outline and planted on the sides, folded over the dorsum. 
Behind these hairs, on the dorsum the minute cup-shaped 
pseudostigmata with their extremely thin, distally 
hairy pseudostigmatic organs. No eyes. — The 
fourth segment bears also only one pair of umbrellas. On 
the cephalothorax there is a marking like a shield, but with 
oil-immersion system I distinctly could discern fine longitu- 
dinal wrinkles. I do not believe it is a real shield. So each 
segment bears 2 umbrellas. 
The abdomen shows 8 segments, of which remarkably 
enough the first four bear 4 umbrellas each, whereas the last 
four are provided with 6 umbrella’s each. The fifth (first 
abdominal) segment has four umbrellas, two near the median 
line and two on the side of the shoulders, so that they stand 
perpendicularly to the abdomen; this row of 4 is bowed for- 
ward. The sixth segment has four umbrellas of which two 
near the median line and two near the shoulders; this row 
of four is bowed backward. The fifth and the sixth segment 
are not distinctly separate. The seventh and eight seg- 
ment have 4 umbrellas each, the row of the seventh is slightly 
bowed backward; that of the eighth slightly forward. The 
ninth, tenth and eleventh segment show 6 umbrellas 
each, those of the ninth placed in a row slightly bowed 
forward; the other in rows slightly bent backward. The 
twelfth segment has also 6 umbrellas, but two of them 
have become ventral. 
The umbrellas are moreover arranged so, that they form 6 
longitudinal rows, two inner rows of 12 umbrellas each, two 
middle rows of 8 umbrellas each, and two outer rows of 4 
umbrellas each. 
On the fifth, sixth, seventh and eighth segments there is a 
marking as if the dorsum is protected by terga and pleura, but 
when using my oil-immersion system, I distinctly could discern 
fine transverse wrinkles of the skin. So I do not believe that the 
