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Genus Oncocephalus

Reduviid - Oncocephalus geniculatus Oncocephalus sp.? - Oncocephalus geniculatus Assassin Bug Nymph - Oncocephalus Oncocephalus geniculatus Assassin Bug 2 - Oncocephalus Oncocephalus sp.  - Oncocephalus geniculatus - male Oncocephalus sp.  - Oncocephalus geniculatus - female Oncocephalus? - Oncocephalus
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 Stenopodainae
Genus Oncocephalus
Synonyms and other taxonomic changes
Baebius Stål 1866, Spilalonius Stål 1868
Explanation of Names
Oncocephalus Klug 1830
Greek 'inflated head' (likely refers to the elevated ocellar area)
4 spp. in our area, >200 spp. worldwide(1)
13-18 mm
The strongly incrassate profemur is a key marker for visually separating this genus from other stenopodaines, most notably from Narvesus. The first rostral segment is not longer than the second, which separates Oncocephalus from Ctenotrachelus and Diaditus; these genera have the first rostral segment subequal or longer than the combined length of the second and third rostral segment. Stenopoda may be separated by its large size, its quadrate head and the unelevated ocellar region. Pnirontis, Pygolampis and Gnathobleda have distinct branched setigerous spines placed posteroventrally to the eye.
key to spp. in(1)
primarily Old World (all but a dozen spp.); in our area, so. US (transcontinental)(1)
come to lights
Works Cited
1.New nearctic species of Oncocephalus Klug (Heteroptera: Reduviidae: Stenopodainae)
Maldonado Capriles J. 1995. Proc. Entomol. Soc. Wash. 97: 791-798.