ACARINA FROM THE JUAN FERNANDIiZ ISLANDS 



561 



The anterior portion has an areolated sculpture owing to a net of narrow ridges; 

 it slopes downwards very abruptly towards the anterior margin which is a thin, 

 horizontal blade very narrow in the middle and almost straight, but widening 

 towards the sides with convex outline. The posterior part slopes more grad- 

 ually backwards and has a complicated sculpture of irregular, darker ridges 

 which radiate from the anterolateral angles and meet in the median line without 

 coalescing. The more or less triangular portions of the cuticle between the 

 lateral margin of the hood, the excavations for coxae I and the pseudostig- 

 matic organs are finely punctured; further backwards the surface is sculptured 

 by small semispherical projections. 



There are no lamellar hairs, or possibly the rostral hairs have disappeared 



Figs. II — 12. Neoliodes Bdckstrovii n. sp. 

 II. Dorsal side of hysterosoma. 12. Larval and 3 nymphal shields, covering the liysterosoma. 



and the one pair of long, slightly s-curved hairs which are inserted near the 

 base of the anterior slope of the hood on small, wart-like projections and point 

 straight outwards are to be considered as homologuous with the lamellar hairs. 

 A comparison with other species, where the anterior pair of hairs is inserted 

 further backwards in a place corresponding to the usual point of insertion of 

 the lamellar hairs, makes it probable that the rostral hairs have disappeared. 

 The interlamellar hairs are very small and inserted close behind the postero- 

 median angles of the pseudostigmata. 



The pseudostigmata (fig. 15) are large, situated on two wartlike pro- 

 jections and point obliquely upwards and outwards. The proximal part of the 

 trumpet is horizontal and plainly visible on lateral view underneath the cuticle. 

 They bend sharply upwards at the middle and then turn obliquely outwards 

 with large apertures with thickened margin which is thinner in the posterior 

 part, where there is a notch. The inner surface has a number of narrow, longi- 



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