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Oops! Thanks for drawing my attention to this - big mistake on my part. The apparent absence of post-sutural acrostichals may have thrown me, but it's a poor excuse - the colour of this specimen clearly makes it subguttata. Scatella silacea has a dark scutellum and both the scutellum and thoracic dorsum are quite shiny, not dull as in this specimen. I am sure that under a microscope the scars of the acrostichals would have been evident.
If you want to find silacea, try coastal seepages where water is constantly trickling down a clay face. Or a sewage treatment plant where trickle filters are being used. The larvae seem to like a thin meniscus of water in which to live.