Although records for this species have been published these have been shown to be misidentifications of S.
immaculatus (see Saville, 2009). Currently, it is considered that S. lachlani does not occur in Britain.
The identification characters used by New (2005) and Lienhard (1998) to separate S. immaculatus and S. lachlani have been shown to be largely unusable with British specimens (see Saville, 2009). The only character that can be used is the ratio of the distance between the eyes to the longest diameter of an eye (IO/D ratio). The ranges of these ratios for the two species are: S. immaculatus - male (0.8-1.1), female (1.6-2.1); S. lachlani - male (1.3-1.5), female (2.2-2.4).
