Appearance
The two species are difficult to distinguish: ''A. similis'' tends to be larger and darker in colouration when an adult, and prefers the indoors. Both species have V-shaped markings on their abdomens, with ''A. similis'' usually having four, and ''A. fenestralis'' two or three. Examination of the genitalia may be needed for precise identification.References:
Some text fragments are auto parsed from Wikipedia.
