ACARINA FROM THE JUAN FERNANDEZ ISLANDS 619 
In the present species the demarcation line between the anal shield and 
the ventral shield is very indistinct even in specimens treated with caustic soda: 
BERLESE considers the absence of a metapodial line as typical (I. c. p. 249) 
»Metapodia intersese concreta, ventrem obtegentia», but at the same time he 
admits into the genus a species, U. e/imata, which he characterizes in the fol- 
lowing way (Acari Mirmecophili p. 337): »La Uvobovella elimata che differisce 
anche per altri caratteri dalle tipiche, presente una specie di linea metapodica 
dietro le zampe del 4° paio, ma ha visibilissima lincisione tra lo scudo ven- 
trale e l’anale». 
In the present species the metapodical line is very fine but quite distinct 
in specimens treated with caustic soda. 
It differs, however, from Uyrodovella by the two low, anteriorly converging 

148 
~ 149 
Figs. 148—149. Uvobovella bicarinata n. sp. 
148. Dorsal view o&. 149. Ventral view co’. 
dorsal ridges in the posterior half of the dorsal shield, a feature which is met 
with in Urodinychus, and from all known Uropodide by the extremely peculiar 
shape of the appendage of the mandibles of the male. The mouth-parts of 
the Uvropodide are, however, too imperfectly known to enable us to draw any 
conclusions from this feature. 
Male. 
Length 1040 », width 740 u. 
Colour chestnut brown. 
Texture polished. 
Shape oval, pointed posteriorly, blunt anteriorly. 
The dorsal: side (fig. 148) is covered by a large, central shield and a 
narrow, marginal shield which tapers considerably towards the posterior end 
and is coalesced with the central shield near the anterior end. The dorsal 
shield, shows, when the mite is treated with boiling lactic acid, an extremely 
finely punctured surface, the punctures being arranged in concentrical rows. 
