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DYS DERULE. 
The male bears a general resemblance to the female, but the anterior margin of its cephalo- 
thorax is more prominent, and its maxillae have an oblique, transverse depression near the 
middle. The radial joint of its palpi is rather larger than the cubital; the digital joint is 
small, oval, convex and hairy externally, and slightly concave underneath, whence the palpal 
organs project at right angles; they are highly developed, somewhat pyriform, greatly dilated 
at the base, filiform at the extremity, which is slightly curved, and are of a pale reddish-brown 
colour. 
In the 'London and Edinburgh Philosophical Magazine,’ the genus Deletrix has been 
proposed for the reception of this minute spider, which is there described, under the specific 
name exilis, from immature females whose colours had been injured by captivity. At that 
time it was not known that the genus Oonops, founded by Mr. Templeton on the organic 
peculiarities of this species, had the claim of priority. 
M. Walckenaer does not admit the validity of the well-defined genus Oonops (misprinted 
Conops ), but has placed this spider in the genus Dj/sdera. See the synonyma. 
Oonops pulcher occupies interstices in rocks and walls, and among lichens growing on 
trees, in Lancashire, Denbighshire, and Caernarvonshire, being abundant in the wooded parts 
of the last two counties. By the agency of the small scopula, connected with the extremity 
of each tarsus, it is enabled to move with celerity and security on dry objects having polished 
perpendicular surfaces. In May the female fabricates near her retreat several contiguous, 
subglobose cocoons of white silk of a delicate but compact texture, measuring about ^th of an 
inch in diameter, in each of which she usually deposits two spherical, pink eggs, not cemented 
together. 
Mr. R. Templeton states that this species is extremely common at Cranmore, and by no 
means rare in Kent; and Mr. J. Hardy has taken specimens of both sexes in Berwickshire. 
