BIUTiSH SPECIES OF PHALANGIDEA OK HARVEST MEN. 177 



characters between Plicdangium and Oligoloplms i.e., the absence 

 (though not invariable) of false joints in the metatarsi of the 

 first pair of legs of the latter and the invariable presence of 3 

 spines or denticulations in a transverse row on or close to the anterior 

 margin of the caput, in front of the ocular eminence. These spines 

 are not found in either of the three British species included here 

 in Plialangium, and their absence will, I believe, be found to be 

 a good distinguishing character from Oligoloplms. M. Simon 

 remarks that Oligolophus glacialis (closely allied to Oligoloplms 

 morio, and included by him in the same genus), has false joints in 

 these metatarsi, whence he appears to infer the untrustworthiness 

 of this character; but in 0. glacialis (a species unknown to 

 me) the anterior margin of the caput is not said to have a 

 transverse row of 3 spines or denticulse on the anterior 

 margin of the caput. I should therefore place this species in 

 Phalangium, though at the same time removing 0. morio from that 

 genus and including it along with Mr. Meade's species of the genus 

 Opilio, but under Dr. Koch's name of Oligoloplms, inasmuch as the 

 name Opilio is already in use for the specific name of the type species 

 of Phalangium. 



PHALANGIUM OPILIO. 



Phalangium opilio Linn (1761). 

 cornutum Linn (1761). 



Meade (1855). 

 opilio Sim. (1879). 



PI. B, fig. 8, and PL A, fig. 15. 



Female ; length 3 to 4 lines ; male 2 to 3, and even 3 \ lines. 

 Colour above of a greyish hue to a brownish yellow (apparently 

 according to age and locality, those in chalky or limestone districts 

 being greyer than others) with a broad, distinctly defined, 

 somewhat tapering, longitudinal, central, strongly angulated dark 

 brown mottled band, usually darkest on the edges and often 

 distinctly margined with whitish or pale yellowish brown. This 

 band is frequently divided longitudinally by a pale stripe. The 

 sides of the abdomen are marked and mottled with brown \ the 



