https://val.vtecostudies.org/projects/vtbees/hylaeus-leptocephalus/
Slender-faced Masked Bee (Hylaeus leptocephalus) | Vermont Atlas of Life
slenderfacedmaskedbeehylaeus
https://itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=755141
ITIS - Report: Hylaeus nigritus
The Integrated Taxonomic Information System (ITIS, www.itis.gov) partners with specialists from around the world to assemble scientific names and their...
itisreporthylaeus
https://denederlandsebijen.nl/Hylaeus/H.angust/Bijen.htm
Hylaeus angustatus
Hylaeus angustatus is te herkennen aan een lijst (plooi, richel) aan de voorrand van het mesopleuron,
hylaeus
https://nature.silene.eu/espece/239776
Hylaeus gibbus | Silene Nature - SINP PACA
hylaeussilenenaturesinppaca