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6.5- 7.0 mm. In Alberta, species of the genus Phimodera are generally slightly smaller and darker in colour than other scutellerids (excepting Fokkeria producta). P. binotata and P. torpida are characterised by a broad X-shaped pattern on the pronotum and paired pale stripes on the leading edge of the scutellum, just below the pronotal angle. While both species of Phimodera in Alberta are quite similar, P. torpida is only known in the province from one record and is probably less likely to be encountered.

In Alberta, there is only one known record of Phimodera torpida, collected in Tilley, near Medicine Hat in August 1940. P. torpida is also found in British Columbia, Saskatchewan, Colorado, Michigan and Utah (McPherson 1982).