ACARINA FROM THE JUAN FERNANDEZ ISLANDS 609 
Loc.: Juan Fernandez, Masatierra, Rabanal in the bottom of the que- 
brada c. 100 m. a. s., among dry leaves, Aug. 1917, no. 775. 
21. Coprholaspis arcuatus n. sp, — Figs. 121—130. 
Although BERLESE (1918, p. 145—173) has taken great pains to define 
clearly the numerous species of this genus described by him, it is evident that 

127 
Figs. 121—127. Coprholaspis arcuatus n. sp. Q. 
121, Dorsal shield. 122. Vertical hair. 123. Shoulder hair. 124. Top of epistome. 
125. Mandible." 126.V ee I tr27. Parsus. iT. 
our state of knowledge of this and allied genera is still very unsatisfactory. 
This is mainly due to the fact that the males are evidently very rare in this 
group and, as a consequence, of the majority of species only the females have 
been described. It is therefore impossible to know whether the characters of the 
sternal shield of the females, employed by BERLESE when subdividing the genus 
Coprholaspis in subdivisions, are correlated with corresponding characters of the 
