Belongs within: Bembicidae.
Ammatomus is a genus of Old World wasps whose biology is poorly known though at least one species may prey on leafhoppers of the family Fulgoridae (Bohart & Menke 1976).
Characters (from Bohart & Menke 1976): Medium-sized wasps: eyes large, inner margins converging strongly below; mandible with an inner subtooth; labrum usually visible; antennae of sexes similar in shape, club-like, last four articles in male not specially modified; median line on frons distinctly impressed; pronotal collar thin and closely appressed to scutum; female foretarsal rake weak, with more than two setae in basitarsal comb before apex; female foreleg arolium larger than other arolia: female forefemur often sharply carinate beneath; posterolateral oblique scutal carina present but faint or merely an angle in the margin; prescutellar sulcus simple; episternal-scrobal sulcus usually evanescent but curving around hypoepimeron when well impressed; omaulus, sternaulus and acetabular carina absent; metapleuron greatly narrowed below; forewing with media diverging before cu-a, stigma small, veinlet of submarginal cell II between recurrents short; jugal lobe larger than tegula, hindwing media diverging well before cu-a; midtibia with two apical spurs; hindtarsus nearly twice as long as midtarsus; propodeal enclosure convex, largely dorsal; no spiracular groove; abdomen not pedunculate or somewhat so; male with seven terga normally visible; sterna without fimbriae, sternum VIII sword-shaped with a small apical emargination; male genitalia with digitus of volsella undifferentiated; female pygidial plate densely setose.
<==Ammatomus Costa 1859C85
|--*A. coarctatus (Spinola 1808)C85 (see below for synonymy)
|--A. africanus Turner 1912BM76
|--A. alipes (Bungham 1897) [=Gorytes alipes]BM76
|--A. asiaticus (Radoszkowski 1886) [=Lestiphorus asiaticus]BM76
|--A. austrinus (Bingham 1912) [=Gorytes austrinus]C85
|--A. biguttatus Arnold 1945BM76
|--A. crassicornis (Mantero 1917) [=Gorytes crassicornis]BM76
|--A. decoratus (Handlirsch 1889)C85 (see below for synonymy)
|--A. elongatulus Turner 1920BM76
|--A. fallax Arnold 1945BM76
|--A. fuscipes (Arnold 1929) [=Arpactus fuscipes]BM76
|--A. gemellus (Arnold 1929) [=Arpactus gemellus]BM76
|--A. icarioides (Turner 1908) [=Gorytes icarioides]C85
|--A. lenis (Nurse 1903) [=Gorytes lenis]BM76
|--A. madecassus (Schulthess 1918) [=Gorytes madecassus]BM76
|--A. mesostenus (Handlirsch 1888) [=Gorytes mesostenus]BM76
| |--A. m. mesostenusBM76
| |--A. m. nikolajevskii (Gussakovskij 1928) [=Gorytes nikolajevskii]BM76
| `--A. m. rhopalocerus (Handlirsch 1895) [=Gorytes rhopalocerus]BM76
|--A. pictipes (Arnold 1929) [=Arpactus pictipes]BM76
|--A. pretoriensis (Arnold 1936) [=Arpactus pretoriensis]BM76
|--A. rogenhoferi (Handlirsch 1888) [=Gorytes rogenhoferi]BM76
|--A. rubicundus Arnold 1945BM76
|--A. rufonodis (Radoszkowski 1877) [=Hoplisus rufonodis]BM76
| |--A. r. rufonodisBM76
| `--A. r. saharae (Handlirsch 1895) [=Gorytes saharae]BM76
|--A. seyrigi Arnold 1945BM76
|--A. sinensis (Yasumatsu 1943) [=Gorytes sinensis]BM76
|--A. spiniferus (du Buysson 1897) [=Gorytes spiniferus]BM76
| |--A. s. spiniferusBM76
| `--A. s. latus Arnold 1951BM76
|--A. stevensoni (Arnold 1929) [=Arpactus stevensoni]BM76
|--A. tanoi Tsuneki 1974BM76
|--A. thaianus Tsuneki 1963BM76
`--A. yoshikawai Tsuneki 1963BM76
*Ammatomus coarctatus (Spinola 1808)C85 [=Gorytes coarctatusC85; incl. G. handlirschii Morawitz 1890BM76, G. mavromoustakisi Balthasar 1954BM76]
Ammatomus decoratus (Handlirsch 1889)C85 [=Gorytes decoratusC85; incl. G. ornatus Smith 1868 non Smith 1856C85, Ammatomus ornatusBM76]
*Type species of generic name indicated
References
[BM76] Bohart, R. M., & A. S. Menke. 1976. Sphecid Wasps of the World. University of California Press: Berkeley.
[C85] Cardale, J. C. 1985. Vespoidea and Sphecoidea. In: Walton, D. W. (ed.) Zoological Catalogue of Australia vol. 2. Hymenoptera: Formicoidea, Vespoidea and Sphecoidea pp. 150–303. Australian Government Publishing Service: Canberra.