Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

National Moth Week photos of insects and people. Here's how to add your images.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


Genus Reduvius

Possible assassin bug? - Reduvius personatus bug in my basement - Reduvius personatus Reduvius personatus Masked Hunter - Reduvius personatus basement insect - Reduvius personatus Reduvius personatus? - Reduvius personatus Tiny Grit-covered Hemipteran for ID - Reduvius personatus Male, Reduvius senilis? - Reduvius senilis - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Cimicomorpha
Family Reduviidae (Assassin Bugs)
Subfamily Reduviinae
Genus Reduvius
Explanation of Names
Reduvius Fabricius 1775
5 spp. in our area, almost 200 worldwide(1)
8-22 mm; only the introduced R. personatus is over 15 mm(2)
Within the Reduviinae of the region, Reduvius species -- like Pseudozelurus -- have the anterior disc of the pronotum unarmed. They are separated from Pseudozelurus by the shape of the membrane cells and basal margin of the pronotum: specifically, in Reduvius the outer cell of the membrane is wider than the inner cell, and the base of the posterior pronotal lobe is not reflexed; the opposite condition is true in Pseudozelurus.
Additionally, 3 of the 4 species of Reduvius in our region are testaceous (i.e. dull reddish-brown) and smaller than 15 mm (the senilis group). The widespread and extremely common R. personatus is black and similar in size to Pseudozelurus but lacks its reddish coloring.
R. personatus (adventive): Canada and much of the US (synanthropic)(3), rare in CA(2); native spp. in sw. US only (so. CA to w. TX, rarely UT)(1)(3) so dust-covered nymphs (<15 mm long) in this region may or may not be R. personatus
The native senilis group species are restricted to semi-arid regions and have been reported from lodges of wood rats (Neotoma sp.) (Ryckman 1954)
Reduvius personatus is found around buildings and in wooded areas, and is attracted to lights.
Adults and nymphs of R. personatus prey on a variety of small arthropods such as woodlice, lacewings, earwigs, bed bugs (Cimex spp.), and Swallow Bugs (Oeciacus vicarius). The senilis group species are probably generalist predators as well.
See Also
Melanolestes species have thicker fore and middle tibiae
Print References
Ryckman R.E. (1954) Reduvius senilus Van Duzee from the lodges of Neotoma in San Juan County, Utah (Hemiptera: Reduviidae). Bull. So. Cal. Acad. Sci. 53(2): 88.
Works Cited
1.Reduvius frommeri, a new species of Reduviidae from the Western Nearctic (Hemiptera: Reduviidae)...
Weirauch C., Russell K., Hwang W.S. 2015. Zootaxa 3972: 267-279.
2.The genus Reduvius Fabricius in western North America (Reduviidae, Hemiptera, Insecta)
Wygodzinsky P., Usinger R.L. 1964. American Museum Novitates 2175: 1-15.
3.Catalog of the Heteroptera, or True Bugs of Canada and the Continental United States
Thomas J. Henry, Richard C. Froeschner. 1988. Brill Academic Publishers.