Bd. V: ii) 
THE ACARI. 
31 
Legs rather short; tarsi II — IV flattened, on the ventral side with a longitudinal, 
knife-shaped ridge. Femora I and II slightly longer than the tibiae; femora III and 
IV slightly shorter. The median halves of epimera III and IV coalesced. 
Claws monodactyle. 
Abdomen oval, well rounded at the hind end. Notogaster not very arched. The 
pteromorphae extend backwards to the middle of the abdomen, gradually narrowing 
(Text-fig. 56). 
The anterior, slightly concave and the lateral margin form a nearly right angle, 
well rounded. 
On the dorsal side, on the border between the central and the marginal portion 
is a band of irregular, rounded, white depressions, where the cuticle is thinner and 
where most probably some excretory pores are situated. Outside this band are 
situated 6 pairs of week hairs and on the hind margin are two pairs of setiform, 
flexible hairs. 
The genital aperture is small, oval, the ratio of length to breadth being as 5 
to 3, situated far forward, between the epimera III and IV and projecting only with 
the last V 4 beyond epimera IV. 
The anal aperture large, quadrangular, with rounded angles, situated far back. 
The above described species seems to be most closely related to Oribatula 
similis , the only other member of the genus which is monodactyle; but it is easily 
recognized through its more elongated shape, the abdomen not being distinctly 
demarcated from the céphalothorax and the crateriform depressions of the abdomen. 
Localities : No. 1 and 14. 
21. Damæus curtipes nov. spec. 1 ) 
(PI. Ill, figs. 3 and 7.) 
Length 0,55 mm. 
Shape oval, pointed anteriorly, rounded posteriorly. 
Céphalothorax long, being about 2 /s of the entire length. Rostrum broad, 
bluntly pointed at the tip; dorsovertex arched, leaving a depressed, well demarcated 
band between it and the abdomen. Pseudostigmata dorsal, near together. Pseu- 
dostigmatic organs rather long (PI. Ill, fig. 7), slightly recurved, with long, slender 
peduncles and lanceolate, hairy heads. No interlamellar hairs. Lamellar hairs 
persisting near the anterior margin of dorsovertex, although there are not any 
z ) After a sketch had been made with the help of the camera lucida the only specimen got smashed 
to pieces through an accident; this has prevented me from giving a more detailed description; at any rate 
the present description will be sufficient for purposes of identification. 
