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Species Dasymutilla occidentalis - Cow Killer

Ant, fuzzy red with black stripe - Dasymutilla occidentalis - female Dasymutilla occidentalis - female Pinned Specimen - Dasymutilla occidentalis - male Side by Side Pair - Dasymutilla occidentalis - male - female Dasymutilla occidentalis - female wasp mimic??? - Dasymutilla occidentalis Velvet ant - Dasymutilla occidentalis Velvet Ant is a Cow Killer, Dasymutilla occidentalis - Dasymutilla occidentalis - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Bees, Ants, and other Stinging Wasps)
Superfamily Vespoidea (Ants, Stinging Wasps, and Hornets)
Family Mutillidae (Velvet Ants)
Genus Dasymutilla
Species occidentalis (Cow Killer)
Other Common Names
Common Eastern Velvet Ant, Red Velvet Ant
Size
15-18, 25 (?) mm
Identification
Females recognized by large size, bold black-and-orange pattern, thorax longer than wide, tip of abdomen has no hair. Hair on dorsal surface may be yellowish, orange, or dull red. Underside is all jet black. Up close, the tips of the middle and hind femora are rounded.

Males have dark brown wings, have different dorsal pattern from female--thorax, head, and only distal half of abdomen have red/orange hairs. (See this illustration from the Univ. of Minnesota.)

This is apparently the largest eastern Dasymutilla, and is the one most frequently noticed.
Range
Connecticut to Florida, west to Missouri, Texas.
Habitat
Meadows, old fields, edges of forests.
Season
Late spring to early fall. May-September (North Carolina).
Food
Adults (males?) take nectar.
Life Cycle
Invades the nest of bumble bees, especially Bombus fraternus. Female searches for bumble bee nests, digs down and deposits one egg near brood chamber. Larva of the Dasymutilla enters the bumble bee brood chamber, kills those larvae, and feeds on them. Larva pupates in the bumble bee brood chamber.
Remarks
Females have a very painful sting.
Print References
Swan and Papp, p. 547--description (1)
Milne, pp. 818-819, fig. 325 (2)
Salsbury, p. 264--photo (3)
Drees, pp. 282-283, fig. 344 (4)
Borror and White, p. 344--description family, p. 344--illustration of female and male Dasymutilla, plate 15--color illustration of female D. occidentalis (5)
Brimley, p. 438 (6)
Internet References
University of Minnesota--has linked images of female and male.
Works Cited
1.The Common Insects of North America
By Lester A. Swan, Charles S. Papp
2.National Audubon Society Field Guide to Insects and Spiders
By Lorus and Margery Milne
3.Narrow Searcher
4.A Field Guide to Common Texas Insects
By Bastiaan M. Drees, John A. Jackman
5.A Field Guide to Insects
By Richard E. White, Donald J. Borror, Roger Tory Peterson
6.Insects of North Carolina
By C.S. Brimley