Hylaeus unicusIslands: Oahu, Molokai, Lanai, Maui
Locations: Oahu - (Aiea Trail, Hapapa, Koolau Summit Trail, Manana Trail, Mt. Kaala, Papali Ridge, Poamoho, Puu Kaua, Waianae, Wiliwilinui Trail)
Molokai - (Kamakou Rd., Pepeopae boardwalk, W. Kawela Gulch)
Lanai - (Munro Trail)
Maui - (Makawao Forest Reserve, Kipahulu Valley, Puu Kukui)
Habitats: Montane wet and mesic forest
Plants: Acacia, Cheirodendron, Dubautia, Metrosideros, Psychotria, Scaevola, Tetraplasandra
Xerces: No info.
Insects of Hawaii: Medium-sized bees with clear to smoky wings and unique, extremely wide supraclypeal area. Male face black or with yellow mark in lower paraocular area or also clypeus; scape moderately dilated and with lateral margin concave and unusual maximum arch near apex. Female black and unmarked or with small yellow marks on paraocular areas and sides ofpronotal collar.
Fullaway (1918:394) pointed out the possible synonymy of H. kauaiensis with H. unicus and H. binominatus, known then as N. laticeps. Although clearly allied, H. kauaiensis is structurally distinct from bees referred to the other two names. However, H. unicus described from Oahu and H. binominatus from Lanai and Molokai are considered here to apply to one species under the name H. unicus. This name has page precedence and is not involved in homonymy. Males are closely similar in the extreme width of the supraclypeal area; shape, dilation, and arch of the scape; propodeal sculpture; and terminalia. On Oahu males are less melanic: a large or small spot on the clypeus, large triangular marks on the paraocular areas, marks at the sides of the pronotal collar, yellowish marks at the bases of the mid and hind tibiae and tarsi, and wings slightly smoky (the figure is of an Oahu specimen). Some females from Oahu have small yellow stripes on the paraocular areas, marks at the sides of the pronotal collar, and smoky wings. On Maui and Lanai the face of males is entirely dark or with triangular marks or traces of yellow in the paraocular areas; no marks on the pronotum or legs; and smoky wings. Females are unmarked and with smoky wings.
Insects of Hawaii Volume 17
Hylaeus near military lands