Subgenus Hylaeus (Heterapoides)

A group of very slender species, similar in appearance, are frequently found together on flowers. They can be recognised from their body shape and other shared characteristics. The wings of both sexes are missing a vein that is present in all other hylaeines and males have noticeably long antennae. Males (not females) of Hylaeus (Edriohylaeus) ofarrelli are also very slender, but may be distinguished by their wing venation which is complete.

The following table may assist with the identification of individual species.

Size
female 3.5 mm; male 3 to 4 mm

Males

species	face	top of head	collar	area above clypeus
nigriconcavus		dull		slightly depressed
digitatus		dull	black in middle	slightly depressed
halictiformis		glossy		not depressed
leviceps		glossy	black in middle	slightly depressed
bacillarius		dull		slightly depressed
delicatus		dull		not depressed
extensus		dull		not depressed

Females

species	face	top of head	collar	scutum
nigriconcavus		female unknown	female unknown	female unknown
digitatus		dull	without marks	dull
halictiformis		glossy		glossy
leviceps		glossy		dull
bacillarius		dull		dull
delicatus		dull		dull
extensus		dull		dull

Flower Visiting Records