Brown beetles are obscure little insects. Brown prionids are a native species that occur throughout eastern North America. My dad grabbed him for me one night so I could photograph him and when I let him go he was way to fast for my camera! Insects are typically drawn to areas by available food supply, weather, environmental factors, water supply, mating patterns etc... and are quite territorial. The insect in the photo is a brown prionid (Orthosoma brunneum), which is a species of longhorned beetle. Orthosoma brunneum. Brown Prionid Explanation of Names Orthosoma brunneum (Forster 1771) Size 25-50 mm Range e. NA Habitat Moist decaying wood Remarks comes to bait & lights (); very common Works Cited 1. … Photo: 09/03/14, 9 pm. Orthosoma brunneum (Brown Prionid). This big boy is a Brown Prionid that was attracted by our porch lights. The common, wood-boring beetle lives in moist forests. Brown Prionid Beetle. Beetles hunger for organic material like tree bark, plant leaves and flour. May beetles belong to a large family of beetles called scarabs. Size: approx. Among the largest is P. californicus, which … Overall, they are among the largest of all beetles, but there is considerable range of size. May beetles, or June bugs, are usually brown, rusty, or black, without patterns such as spots or stripes, and rather hairy beneath. Note: Please understand that that insects do not adhere to man-drawn borders on a map as such they may be found beyond the general "reach" as showcased on our website. I'm not sure if the specimen in the photo is a female or male. Brown Prionid, Orthosoma brunneum, subfamily Prioninae, family Cerambycidae. Shortly after mating the female lays single cream to yellow-brown 4.8 mm eggs, of which she can produce up to 200 in her lifetime, 1.25 to 3.8 cm below the soil surface near the roots of suitable hosts. As their scientific name, Bromius obscurus, suggests, they are quite small--5mm to be exact, but can be a big nuisance to gardeners and home owners. The larvae, cream to brown in color and strongly segmented, seek out roots shortly after hatching. Species ID Suggestions Sign in to suggest organism ID. They are nocturnal and are attracted to lights at night. Note: Please understand that that insects do not adhere to man-drawn borders on a map as such they may be found beyond the general "reach" as showcased on our website. 1 Response. Tweet; Description: This guy is by far the largest insect in my neighborhood. All are brown, but variation among and within species is considerable from light, reddish browns to ones that are nearly black. Insects are typically drawn to areas by available food supply, weather, environmental factors, water supply, mating patterns etc... and are quite territorial. 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