Spilodiscus instratus

The genus Spilodiscus is characterized by distinctive color patterns, with some species displaying red maculations on the elytra. The specific name 'instratus' may refer to markings or striations, though this requires verification. For precise identification, examination of antennal club structure, prosternal lobe, and elytral striation patterns is necessary. Comparison with other Spilodiscus species such as S. stenostomus and S. flaviceps is required, as these can occur in overlapping ranges.

Has been observed in sandy habitats, including dune areas and hard-packed sandy soils. Associated with flowering plants in open, dry environments. One field record documents the species on Pyrrhopappus pauciflorus (smallflower desert-chicory) in a sandy area with dunes.

North America: Canada (Alberta, British Columbia, Manitoba, Saskatchewan) and United States (Arizona, Arkansas, California, Colorado, Idaho, Kansas, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, Texas, Utah, Washington, Wisconsin, Wyoming).

Adults have been observed in early May in Oklahoma, suggesting spring activity. Given the broad latitudinal range, activity periods likely vary geographically.

Adults have been observed on flowers, suggesting possible pollen feeding or use of flowers as hunting sites for small prey. One observation describes the beetle as moving actively on the ground near flowers.

• Spilodiscus stenostomusAnother North American Spilodiscus species with which S. instratus may be confused; requires careful examination of mouthpart and prosternal characters
• Spilodiscus flavicepsShares similar size range and habitat preferences; distinguished by head and pronotal coloration patterns

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