Small Flower Wasp
Male, ventral + wing venation
Large Yellow Flower Wasp
Male, profile
Large Yellow Flower Wasp (Catocheilus)Class: Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)
Order: Ant Bee Wasps (Hymenoptera)
Family: Flower Wasp (Wasp: Tiphiidae)
Species: Large Yellow Flower Wasp (Catocheilus)
This Photo:     Male, dorsal, ~25mm

General Species Information:
Found on Ellura (in the Murray Mallee, SA), and elsewhere
As with other Tiphiidae flower wasps, the female is much smaller & wingless. She may also be blind, or at least have poor vision. This is our 1st Tiphiidae found on Ellura and luckily we not only saw & photographed them mating (proves male/female relationship), but also caught them to get sizes and detailed photographs.
We released her were found where she'll find a beetle to parasitise with her now fertile eggs.
Even with his large size, he had a lot of trouble flying with her and allowed us to capture them.
While similar in appearance, with the naked eye, to the European Wasp, this species is much larger and has a cigar shaped abdomen. On closer inspection, and with photographs, the differences are much clearer.
A more technical term for reduced wingless insects is "Apterous".

Copyright © 2017- Brett & Marie Smith. All Rights Reserved. Photographed 27-Apr-2017
This species is an Australian Native Species, not listed in the SA Murray Mallee Survey of 2010.