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The subfamily Crabroninae ''(digger wasps)'' is the most diverse group in the 
wasp
A wasp is any insect of the narrow-waisted suborder Apocrita of the order Hymenoptera which is neither a bee nor an ant; this excludes the broad-waisted sawflies (Symphyta), which look somewhat like wasps, but are in a separate suborder. ...
family Crabronidae
The Crabronidae are a large paraphyletic group (nominally a family) of wasps, including nearly all of the species formerly comprising the now-defunct superfamily Sphecoidea. It collectively includes well over 200 genera, containing well over 9 ...
, containing over 110 genera and 4,800 described species. The subfamily consists of solitary, predator
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill th ...
y wasps. The adult females of many groups dig tunnels in the ground for nesting, but others use different techniques, including the construction of tube-like mud nests (e.g., ''Trypoxylon politum
The organ pipe mud dauber (''Trypoxylon politum'') is a predatory wasp in the family Crabronidae. They are fairly large wasps, ranging from 3.9–5.1 cm, and have been recorded to fly from May to September. Female and male are similar in co ...
'').
As with all other sphecoid
The Spheciformes is a paraphyletic assemblage of insect families which collectively comprise the "sphecoid wasps". Larvae are carnivorous.
These are all the members of the superfamily Apoidea
The superfamily Apoidea is a major group within t ...
wasps, the larvae are carnivorous; females hunt for prey on which to lay their eggs, supplying the larvae with paralyzed, living prey when they emerge.
References
Crabronidae Apocrita subfamilies {{Apoidea-stub