Sphecius speciosus

Sphecius speciosus (Drury, 1773)

Common Names

Cicada killer (English)

Languages: English

Overview

Brief Summary

The Eastern Cicada Killer (Sphecius speciosus) has been reported from nearly all states in the United States east of the continental divide, as well as southern Ontario (Canada) to the north and Guatemala, Honduras, and northeastern Mexico to the south (Holliday & Coelho 2006). Females dig nest burrows in well-drained soil, often forming large nesting aggregations, and provision nest cells with cicadas they capture and paralyze in nearby trees. Several studies have found that the number of cicadas provided to each offspring is fairly consistent, with sons given 1 (sometimes 2) cicadas and daughters given 2 (sometimes 3) cicadas regardless of cicada size. (Hastings et al. 2010 and references therein). Females are generally larger than male-- often over 4 cm in length--and they can provision their nests with cicadas more than 2.5 times their size (Coelho 1997).

Sphecius speciosus is known to capture cicadas of 5 genera (Diceroprocta, Magicicada, Neocicada, Quesada, Tibicen), including more than two dozen species/subspecies (D. cinctifera, D. olympusa, D. viridifascia, and D. vitripennis; Magicicada cassinii and M. septendecim; Neocicada hieroglyphica and  N. h. johannis; Quesada gigas; Tibicen auletes, T. canicularis, T. davisi, T. dealbatus, T. dorsatus, T. figuratus, T. linnei, T. lyricen, T. lyricen engelhardti, T. lyricen virescens, T. pruinosus, T. resh, T. resonans, T. robinsonianus, T. similaris, T. tibicen, T. tibicen australis, T. walkeri, T. walkeri pronotalis, and T. winnemanna). Five species of Tibicen (T. canicularis, T. linnei, T. lyricen, T. pruinosus,  and T. tibicen [including T. chloromerus, a junior synonym of T. tibicen] are captured most frequently by S. speciosus, together accounting for 88% of specimens taken. (Holliday et al. 2009)

Available data indicate no significant overall prey sex bias. However, Holliday et al. (2009) found that at sites where more than 50 cicada prey were recorded, the male to female ratio of 6 species brought to nests by Sphecius females varied between 0.524 and 2.259. At these sites, chi-square analysis revealed a significant male bias in overall prey sex ratio. The reported significant local variations in prey sex ratios are likely to be due to temporal variations in sex ratios of cicadas available to these opportunistic wasps. (Holliday et al. 2009)

Hastings et al. (2010) studied size-specific provisioning in S.speciosus in northern Florida. They found that individual female cicada killers at these locations exhibited size-specific prey selection. Small wasps brought only small cicadas to their nests, probably because they are unable to carry large cicadas in flight. Large wasps, which are not as constrained in this way, rarely provision their nests with small cicadas. It appears that these wasps selectively hunt the largest prey they can carry in flight. (Hastings et al. 2010)   In contrast to the findings of Hastings et al, however, some previous studies in other areas have concluded that female S. speciosus hunted opportunistically, without regard to prey size. (Coelho 1997; Grant 2006). Hastings et al. suggest that this discrepancy may be explained at least in part by the fact that at these other locations the available prey were relatively uniform in size.

DNA sequence analyses by Hastings et al. (2008) have raised the possibility that S. convallis and S. speciosus may not actually be distinct species

Author(s): Shapiro, Leo
Rights holder(s): Shapiro, Leo

Ecology

Distribution

Sphecius speciosus has been reported from Canada (Ontario), Guatemala, Honduras, Mexico (Chihuahua, Coahuila, Nuevo Leon), and the following 39 of the 41 states east of the continental divide plus Washington, D.C. and Arizona (apparently not yet reported from Vermont and Michigan): Alabama, Arkansas, Colorado, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Minnesota, Maine, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Virginia, Wisconsin, West Virginia, and Wyoming (Holliday and Coelho 2006).

Author(s): Shapiro, Leo
Rights holder(s): Shapiro, Leo

References

Coelho, J. R. (1997).  Sexual size dimorphism and flight behavior in cicada killers (Sphecius speciosus). Oikos. 79, 371-375.
Grant, P. R. (2006).  Opportunistic predation and offspring sex ratios of cicada-killer wasps (Sphecius speciosus Drury). Ecological Entomology. 31, 539-547.
Hastings, J. M., Holliday C. W., Long A., Jones K., & Rodriguez G. (2010).  SIZE-SPECIFIC PROVISIONING BY CICADA KILLERS, SPHECIUS SPECIOSUS, (HYMENOPTERA: CRABRONIDAE) IN NORTH FLORIDA. Florida Entomologist. 93, 412-421.
Hastings, J. M., Schultheis P. J., Whitson M., Holliday C. W., Coelho J. R., & Mendell A. M. (2008).  DNA barcoding of new world cicada killers (Hymenoptera: Crabronidae). Zootaxa. 1713, 27-38.
Holliday, C. W., & Coelho J. R. (2006).  Improved key to New World species of Sphecius (Hymenoptera: Crabronidae). Annals of the Entomological Society of America. 99, 793-798.
Holliday, C. W., Hastings J. N., & Coelho J. R. (2009).  CICADA PREY OF NEW WORLD CICADA KILLERS, SPHECIUS SPP. (DAHLBOM, 1843) (HYMENOPTERA: CRABRONIDAE. Entomological News. 120, 1-17.