A. C. OÜDEMANS, NOTES ON ACARI. 223 



Parasitus primitivus n o v. s p. 1 Dent; 2 c/; 2 j. 



4. Acari of French Guiana. 



The same species was found by Dr. Heim, in vegetable 

 earth, received by him from Cayenne. 



5. Parasitus delta Oudms. 



(With Plate 8, fig. 1—7). 



Parasitis delta Oudms. in Entom. Bericht, n". 17, p. 153; 

 1, V, 1904. 



Larva. Length 320 jj.. Shape oval, almost hexagonal 

 or lozenge shaped, with rounded angles and rounded sides. 

 Colour white. Texture apparently smooth ; but with 

 immersion I perceived extremely fine wrinkles on the margins 

 and on the belly, not on the dorsum, where onl}' some wrinkles 

 are discernable, surrounding a space, exactly corresponding 

 with a d o r s a 1 shield, and imitating segments. Dorsal 

 side (Fig. 1); there is a pair of strong bristles above coxae III; 

 passing about one third of their own length the edge of the 

 body. Before this pair the prosoma counts 7 pair of bristles, 

 and behind it the metasoma is provided with 7 bristles too, 

 viz. two inner rows of 4, and two outer rows of 3 smaller 

 bristles each. 



Ventral side. Tritosternum (Fig. 5) long; late- 

 rally in its third fourth part slightly fringed ; distally bifid ; 

 each branch again bifid : outer slips shorter than inner ones; 

 all the slips distally feathered. No s e c u n d a r y shields. 

 (Fig. 2). A little behind coxae I a pair of bristles, belonging 

 to this segment. Between coxae II a pair of bristles, belon- 

 ging to this fourth postoral segment. Between coxae III a 

 pair of bristles, belonging to this fifth postoral segment. 

 Behind coxae III two pairs of bristles, forming a transverse 



